{"product_id":"msa-gmd-ammonia-methylamine-cartridge","title":"MSA 464033 GMD Ammonia \/ Methylamine Cartridge for Comfo Respirators — Box of 10","description":"\u003cdiv style=\"background:#1a1a1a;border:2px solid #ff9800;border-radius:6px;padding:16px 20px;margin:0 0 24px 0;color:#e0e0e0;font-size:0.95em;line-height:1.5;\"\u003e\n\u003cstrong style=\"color:#ff9800;\"\u003e★ WC Safety Editorial Review — MSA GMD Ammonia \/ Methylamine Cartridge\u003c\/strong\u003e\u003cbr\u003eRated 4.4\/5 — dedicated ammonia and methylamine cartridge for the MSA Comfo bayonet platform. Purpose-built for wastewater treatment, refrigeration (R-717), and fertilizer handling.\u003cdiv style=\"margin-top:12px;display:flex;flex-wrap:wrap;gap:8px;\"\u003e\n\u003ca href=\"\/blogs\/product-reviews\/msa-464033-gmd-ammonia-methylamine-cartridge-review\" style=\"display:inline-block;background:#ff9800;color:#1a1a1a;padding:8px 18px;text-decoration:none;font-weight:700;border-radius:4px;font-size:0.9em;\" title=\"Read the full MSA GMD Ammonia \/ Methylamine Cartridge editorial review\"\u003eRead Full Review →\u003c\/a\u003e\u003ca href=\"\/collections\/msa-respirator-filters-and-cartridges\" style=\"display:inline-block;background:#1a2733;color:#e0e0e0;padding:8px 18px;text-decoration:none;font-weight:700;border-radius:4px;border:1px solid #ff9800;font-size:0.9em;\" title=\"Compare all MSA respirator cartridges and filters\"\u003eCompare All MSA Cartridges →\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-description-rich\"\u003e\n\n\u003c!-- 0. EDITORIAL REVIEW BOX --\u003e\n\u003cdiv class=\"wc-review-box\" style=\"border:2px solid #ff9800;background:#2a2520;border-radius:8px;padding:20px 24px;margin:0 0 24px 0;color:#f5e6d3;\"\u003e\n  \u003cdiv style=\"display:flex;align-items:center;gap:12px;margin-bottom:12px;flex-wrap:wrap;\"\u003e\n    \u003cspan style=\"background:#ff9800;color:#1a1a1a;font-weight:bold;padding:4px 12px;border-radius:4px;font-size:0.95em;\"\u003eEDITORIAL REVIEW: 4.2\/5\u003c\/span\u003e\n    \u003cspan style=\"color:#ffb74d;font-size:0.9em;\"\u003eWC Safety Review — MSA GMD Ammonia \/ Methylamine Cartridge\u003c\/span\u003e\n  \u003c\/div\u003e\n  \u003cp\u003e\u003cstrong\u003eBest For:\u003c\/strong\u003e Wastewater treatment operators, refrigeration technicians, fertilizer plant workers, and cold-storage facility staff who work around ammonia or methylamine vapors at concentrations where a half-mask with APF 10 is sufficient.\u003c\/p\u003e\n  \u003cp\u003e\u003cstrong\u003eNot For:\u003c\/strong\u003e Environments with particulate hazards (dust, mist, fume), oxygen-deficient atmospheres, immediately dangerous to life or health (IDLH) concentrations, or applications requiring combined OV\/acid gas protection alongside ammonia coverage.\u003c\/p\u003e\n  \u003cp\u003e\u003cstrong\u003eBottom Line:\u003c\/strong\u003e The MSA GMD delivers chemically specific, NIOSH-approved ammonia and methylamine protection at a cost-effective $17.96 per cartridge — pair it with the \u003ca href=\"\/products\/msa-gmd-p100-ammonia-particulate-cartridge\" style=\"color:#ff9800;\"\u003eMSA GMD-P100\u003c\/a\u003e when a particulate co-hazard is present.\u003c\/p\u003e\n  \u003cp style=\"font-size:0.9em;color:#cbb89e;\"\u003eEditorial assessment by the WC Safety Editorial Team. Scoring reflects published manufacturer specifications, application fit, compatibility, and category expertise. WC Safety did not laboratory-test this product.\u003c\/p\u003e\n  \u003cp\u003e\u003ca href=\"\/blogs\/product-reviews\/msa-464033-gmd-ammonia-methylamine-cartridge-review\" style=\"color:#ff9800;font-weight:bold;\"\u003eRead the full review\u003c\/a\u003e →\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c!-- CTA BUTTONS --\u003e\n\u003cp\u003e\n  \u003ca href=\"https:\/\/www.amazon.com\/dp\/B005QQDMEE?tag=wcsafety04-20\" style=\"display:inline-block;background:#ff9800;color:#1a1a1a;padding:10px 20px;border-radius:4px;text-decoration:none;font-weight:bold;margin:4px 8px 4px 0;\"\u003eBuy on Amazon\u003c\/a\u003e\n  \u003ca href=\"\/products\/msa-gmd-ammonia-methylamine-cartridge\" style=\"display:inline-block;background:#2a2520;color:#ff9800;border:2px solid #ff9800;padding:10px 20px;border-radius:4px;text-decoration:none;font-weight:bold;margin:4px 0;\"\u003eShop WC Safety\u003c\/a\u003e\n\u003c\/p\u003e\n\u003cp style=\"font-size:0.85em;color:#888;margin:4px 0 12px;\"\u003e\u003cem\u003eAffiliate disclosure: WC Safety earns a commission on Amazon purchases at no cost to you.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003c!-- 1. OVERVIEW --\u003e\n\u003ch2 style=\"color:#ff9800;\" id=\"gmd-overview\"\u003eMSA GMD Ammonia \/ Methylamine Cartridge Overview\u003c\/h2\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eThe MSA GMD (Part No. 464033) is a NIOSH-approved, chemically specific cartridge designed exclusively for ammonia and methylamine vapor hazards — it uses an impregnated sorbent bed rather than standard activated carbon, and it ships in a \u003cstrong\u003ebox of 10 cartridges at $179.63 ($17.96 per cartridge)\u003c\/strong\u003e. If your facility runs \u003ca href=\"\/blogs\/guides\/how-to-choose-a-respirator-cartridge\" style=\"color:#4fc3f7;\"\u003ea cartridge-selection protocol\u003c\/a\u003e, the GMD belongs on the shortlist any time ammonia or methylamine is the primary vapor threat and particulate loading is absent. Understanding \u003ca href=\"\/blogs\/guides\/respirator-filter-types-explained\" style=\"color:#4fc3f7;\"\u003ehow different filter media work\u003c\/a\u003e helps clarify why a chemically impregnated cartridge is the correct choice here rather than a standard organic-vapor unit. Browse the full \u003ca href=\"\/collections\/msa-respirator-filters-and-cartridges\" style=\"color:#4fc3f7;\"\u003eMSA Respirator Filters \u0026amp; Cartridges\u003c\/a\u003e collection to compare this cartridge against every GM-series option, and see the \u003ca href=\"\/blogs\/guides\/respirator-cartridge-color-chart\" style=\"color:#4fc3f7;\"\u003erespirator cartridge color-code chart\u003c\/a\u003e for NIOSH color-band reference across manufacturers.\u003c\/p\u003e\n\n\u003c!-- 2. RESPIRATOR SELECTION FIT --\u003e\n\u003ch2 style=\"color:#ff9800;\" id=\"gmd-selection-fit\"\u003eWhere the MSA GMD Fits in Respirator Selection\u003c\/h2\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eConfirm the hazard before selecting this cartridge: the GMD is appropriate when \u003cstrong\u003eammonia or methylamine is the sole vapor hazard\u003c\/strong\u003e and airborne concentrations are \u003cem\u003ebelow the IDLH threshold\u003c\/em\u003e (IDLH for ammonia is 300 ppm; for methylamine, 100 ppm). The MSA GMD carries an \u003cstrong\u003eAssigned Protection Factor (APF) of 10\u003c\/strong\u003e under OSHA 29 CFR 1910.134 when used on a properly fit-tested half-mask. That means it is suitable for exposures up to 10× the applicable PEL or TLV — confirm with your industrial hygienist that concentrations fall within that band. If particulate co-hazards such as fertilizer dust or ammonia mist are also present, step up to the \u003ca href=\"\/products\/msa-gmd-p100-ammonia-particulate-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GMD-P100 combination cartridge\u003c\/a\u003e. If your site has mixed acid-gas and ammonia exposure, evaluate the \u003ca href=\"\/products\/msa-gme-multigas-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GME multi-gas cartridge\u003c\/a\u003e or the \u003ca href=\"\/products\/msa-gme-p100-multigas-particulate-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GME-P100\u003c\/a\u003e instead. Review the \u003ca href=\"\/blogs\/guides\/how-to-choose-a-respirator-cartridge\" style=\"color:#4fc3f7;\"\u003ecomplete respirator cartridge selection guide\u003c\/a\u003e and the \u003ca href=\"\/blogs\/guides\/respirator-filter-types-explained\" style=\"color:#4fc3f7;\"\u003efilter-types explained guide\u003c\/a\u003e for a decision framework that covers all hazard categories.\u003c\/p\u003e\n\n\u003c!-- 3. WHO SHOULD BUY --\u003e\n\u003ch2 style=\"color:#ff9800;\" id=\"gmd-who-buys\"\u003eWho Should Buy the MSA GMD Ammonia \/ Methylamine Cartridge?\u003c\/h2\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003e\u003cstrong style=\"color:#ffb74d;\"\u003eBuy the MSA GMD if:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul style=\"color:#e0e0e0;\"\u003e\n  \u003cli\u003eYou already own a Comfo Classic, Comfo II, or Advantage 200 LS half-mask and need NIOSH-approved ammonia\/methylamine coverage.\u003c\/li\u003e\n  \u003cli\u003eYour IH assessment confirms ammonia or methylamine as the primary vapor hazard with no significant particulate fraction.\u003c\/li\u003e\n  \u003cli\u003eYou want chemical-specific protection at a lower per-cartridge cost than combination cartridges — $17.96 each versus combination units.\u003c\/li\u003e\n  \u003cli\u003eYou work in wastewater treatment, commercial refrigeration, cold storage, livestock facility management, or fertilizer distribution.\u003c\/li\u003e\n  \u003cli\u003eYour facility requires cartridge-specific NIOSH approval documentation for 42 CFR Part 84 compliance records.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003e\u003cstrong style=\"color:#ffb74d;\"\u003eDo not buy the MSA GMD if:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul style=\"color:#e0e0e0;\"\u003e\n  \u003cli\u003eParticulate hazards (dust, aerosols, fume) are co-present — use the \u003ca href=\"\/products\/msa-gmd-p100-ammonia-particulate-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GMD-P100\u003c\/a\u003e instead.\u003c\/li\u003e\n  \u003cli\u003eYou need organic vapor or acid gas coverage alongside ammonia — use the \u003ca href=\"\/products\/msa-gme-multigas-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GME multi-gas cartridge\u003c\/a\u003e.\u003c\/li\u003e\n  \u003cli\u003eYou own an MSA Advantage 200, 290, 420, or 1000 half-mask — those use the Advantage snap-on mount, not the GM bayonet. See \u003ca href=\"\/collections\/msa-half-mask-respirator\" style=\"color:#4fc3f7;\"\u003eMSA half-mask respirators\u003c\/a\u003e to verify your mask series before ordering.\u003c\/li\u003e\n  \u003cli\u003eConcentrations are at or above IDLH — a supplied-air respirator or SCBA is required.\u003c\/li\u003e\n  \u003cli\u003eYou use a full-face MSA respirator on the Advantage platform — check the \u003ca href=\"\/collections\/msa-full-face-mask-respirator\" style=\"color:#4fc3f7;\"\u003eMSA full-face mask respirator\u003c\/a\u003e collection for compatible cartridges.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c!-- 4. WHAT IT PROTECTS AGAINST --\u003e\n\u003ch2 style=\"color:#ff9800;\" id=\"gmd-protection\"\u003eWhat Does the MSA GMD Protect Against?\u003c\/h2\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eThe GMD cartridge uses a chemically impregnated sorbent bed approved under NIOSH 42 CFR Part 84 for the following hazards:\u003c\/p\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;background:#1a1a1a;color:#e0e0e0;margin:16px 0;\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth style=\"border:1px solid #444;padding:10px 14px;text-align:left;color:#ffb74d;background:#222;\"\u003eHazard\u003c\/th\u003e\n      \u003cth style=\"border:1px solid #444;padding:10px 14px;text-align:left;color:#ffb74d;background:#222;\"\u003eNIOSH Approval Fit\u003c\/th\u003e\n      \u003cth style=\"border:1px solid #444;padding:10px 14px;text-align:left;color:#ffb74d;background:#222;\"\u003eBuyer Guidance\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eAmmonia (NH₃)\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eNIOSH-approved, 42 CFR Part 84\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003ePrimary intended use; wastewater, refrigeration, fertilizer\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#1e1e1e;\"\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eMethylamine (CH₃NH₂)\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eNIOSH-approved, 42 CFR Part 84\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eChemical synthesis, tanning, pharmaceutical manufacturing\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eOther aliphatic amines\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eNot NIOSH-approved under this cartridge designation\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eConsult your IH and MSA Safety for specific amine approvals; consider the \u003ca href=\"\/products\/msa-gme-multigas-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GME\u003c\/a\u003e for broader coverage\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003c!-- 5. WHAT IT DOES NOT PROTECT AGAINST --\u003e\n\u003ch2 style=\"color:#ff9800;\" id=\"gmd-not-protect\"\u003eWhat the MSA GMD Does NOT Protect Against\u003c\/h2\u003e\n\u003cul style=\"color:#e0e0e0;\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eParticulates\u003c\/strong\u003e — no filter media; for dust, mist, or aerosol co-hazards use the \u003ca href=\"\/products\/msa-gmd-p100-ammonia-particulate-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GMD-P100 combination cartridge\u003c\/a\u003e\n\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOrganic vapors\u003c\/strong\u003e — standard solvents, hydrocarbons, and VOCs are not captured by the impregnated sorbent; use the \u003ca href=\"\/products\/msa-gma-organic-vapor-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GMA organic vapor cartridge\u003c\/a\u003e for those hazards\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAcid gases\u003c\/strong\u003e — chlorine, hydrogen chloride, sulfur dioxide require the \u003ca href=\"\/products\/msa-gmb-acid-gas-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GMB acid gas cartridge\u003c\/a\u003e or a combination unit\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCombined OV + acid gas + ammonia\u003c\/strong\u003e — the \u003ca href=\"\/products\/msa-gme-multigas-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GME multi-gas cartridge\u003c\/a\u003e covers this spectrum\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMercury vapor\u003c\/strong\u003e — requires the \u003ca href=\"\/products\/msa-mersorb-p100-mercury-vapor-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA Mersorb P100 mercury vapor cartridge\u003c\/a\u003e\n\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIodine and radioiodine\u003c\/strong\u003e — requires the \u003ca href=\"\/products\/msa-gmi-iodine-p100-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GMI iodine P100 cartridge\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"background:#2a1a1a;border-left:4px solid #ff5252;padding:14px 18px;margin:16px 0;color:#ffcdd2;border-radius:4px;\"\u003e\n  \u003cstrong\u003eSafety Notice:\u003c\/strong\u003e Air-purifying respirators, including the MSA GMD, \u003cstrong\u003edo not supply oxygen\u003c\/strong\u003e and must never be used in oxygen-deficient atmospheres (below 19.5% O₂) or in immediately dangerous to life or health (IDLH) concentrations. When ammonia concentrations approach or exceed the IDLH of 300 ppm, or when the atmosphere is unknown, a supplied-air respirator or self-contained breathing apparatus (SCBA) is required.\n\u003c\/div\u003e\n\n\u003c!-- 6. BEST APPLICATIONS --\u003e\n\u003ch2 style=\"color:#ff9800;\" id=\"gmd-applications\"\u003eBest Applications for the MSA GMD Cartridge\u003c\/h2\u003e\n\n\u003ch3 style=\"color:#ffb74d;\"\u003eWastewater Treatment and Utility Operations\u003c\/h3\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eAmmonia is a routine byproduct at wastewater treatment plants — from digester headspace to chemical feed areas — and operators pulling filter media, inspecting wet wells, or handling anhydrous ammonia feed systems rely on cartridges rated specifically for this hazard. The MSA GMD paired with a Comfo II or Comfo Classic half-mask provides documented APF 10 protection in routine maintenance and inspection tasks where concentrations are confirmed below IDLH. Consult the \u003ca href=\"\/blogs\/guides\/how-to-choose-a-respirator-cartridge\" style=\"color:#4fc3f7;\"\u003ecartridge selection guide\u003c\/a\u003e to build out your facility's respiratory program.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#ffb74d;\"\u003eCommercial Refrigeration and Cold Storage\u003c\/h3\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eIndustrial refrigeration systems that use anhydrous ammonia (R-717) as refrigerant require workers to carry appropriate respiratory protection for leak response, routine inspection, and preventive maintenance tasks. The GMD is the correct cartridge for ammonia-specific vapor control in these applications. When maintenance tasks also generate compressor oil mist or other particulates, step up to the \u003ca href=\"\/products\/msa-gmd-p100-ammonia-particulate-cartridge\" style=\"color:#4fc3f7;\"\u003eGMD-P100 combination cartridge\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#ffb74d;\"\u003eFertilizer Distribution and Agricultural Operations\u003c\/h3\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eAnhydrous ammonia handling at fertilizer terminals, nurse tanks, and application equipment creates concentrated ammonia vapor exposure risk. The GMD addresses the vapor component; when dusts from granular fertilizers are simultaneously airborne, add the P100 layer with the GMD-P100 variant. See the full \u003ca href=\"\/collections\/msa-respirator-filters-and-cartridges\" style=\"color:#4fc3f7;\"\u003eMSA filter and cartridge collection\u003c\/a\u003e to compare available protection levels for agricultural environments.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#ffb74d;\"\u003eChemical Manufacturing and Pharmaceutical Processing\u003c\/h3\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eMethylamine is a key intermediate in pharmaceutical synthesis, agrochemicals, and specialty chemical manufacturing. Workers in these environments who need a Comfo-platform-compatible methylamine cartridge will find the GMD is one of the few NIOSH-approved cartridges explicitly rated for this compound. Review \u003ca href=\"\/blogs\/guides\/respirator-filter-types-explained\" style=\"color:#4fc3f7;\"\u003ehow sorbent impregnation differs from activated carbon beds\u003c\/a\u003e when specifying protection for reactive amines.\u003c\/p\u003e\n\n\u003c!-- 7. PROS \/ CONS --\u003e\n\u003ch2 style=\"color:#ff9800;\" id=\"gmd-pros-cons\"\u003eMSA GMD Pros and Cons\u003c\/h2\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;background:#1a1a1a;color:#e0e0e0;margin:16px 0;\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth style=\"border:1px solid #444;padding:10px 14px;text-align:left;color:#ffb74d;background:#222;width:50%;\"\u003ePros\u003c\/th\u003e\n      \u003cth style=\"border:1px solid #444;padding:10px 14px;text-align:left;color:#ffb74d;background:#222;width:50%;\"\u003eCons\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;vertical-align:top;\"\u003eNIOSH-approved specifically for ammonia and methylamine under 42 CFR Part 84\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;vertical-align:top;\"\u003eNo particulate filtration — a pure vapor cartridge only\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#1e1e1e;\"\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;vertical-align:top;\"\u003eChemically impregnated sorbent engineered for the ammonia\/methylamine hazard class rather than generic activated carbon\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;vertical-align:top;\"\u003eLimited to Comfo bayonet-mount respirators — not compatible with Advantage snap-on platforms\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;vertical-align:top;\"\u003eCost-effective at $17.96 per cartridge when purchased in the 10-pack\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;vertical-align:top;\"\u003eSingle-hazard class — not suitable for mixed OV\/acid gas\/ammonia scenarios without upgrading to GME\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#1e1e1e;\"\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;vertical-align:top;\"\u003eBayonet quarter-turn mount enables fast cartridge change in the field without tools\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;vertical-align:top;\"\u003eNo ESLI (end-of-service-life indicator) — relies on scheduled change-out or odor breakthrough detection\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;vertical-align:top;\"\u003eSold in a 10-pack which suits facility stocking and team-level programs\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;vertical-align:top;\"\u003eNot rated for IDLH or oxygen-deficient atmospheres\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003c!-- 8. COMPATIBLE MSA RESPIRATORS --\u003e\n\u003ch2 style=\"color:#ff9800;\" id=\"gmd-compatibility\"\u003eCompatible MSA Respirators\u003c\/h2\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eThe MSA GMD uses a \u003cstrong\u003ethreaded bayonet (quarter-turn) mount\u003c\/strong\u003e — the Comfo-platform connection system. It is \u003cstrong\u003enot\u003c\/strong\u003e compatible with the MSA Advantage snap-on connection used on the Advantage 200, 290, 420, and 1000 series. Verify your mask series before ordering.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;background:#1a1a1a;color:#e0e0e0;margin:16px 0;\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth style=\"border:1px solid #444;padding:10px 14px;text-align:left;color:#ffb74d;background:#222;\"\u003eRespirator Model\u003c\/th\u003e\n      \u003cth style=\"border:1px solid #444;padding:10px 14px;text-align:left;color:#ffb74d;background:#222;\"\u003eSeries \/ Platform\u003c\/th\u003e\n      \u003cth style=\"border:1px solid #444;padding:10px 14px;text-align:left;color:#ffb74d;background:#222;\"\u003eCompatible?\u003c\/th\u003e\n      \u003cth style=\"border:1px solid #444;padding:10px 14px;text-align:left;color:#ffb74d;background:#222;\"\u003eNotes\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eComfo Classic (Hycar)\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eComfo \/ GM bayonet\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;color:#81c784;\"\u003eYes\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eHalf-mask; quarter-turn bayonet mount confirmed\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#1e1e1e;\"\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eComfo Classic (Silicone)\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eComfo \/ GM bayonet\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;color:#81c784;\"\u003eYes\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eSilicone facepiece; same bayonet connection\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eComfo II\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eComfo \/ GM bayonet\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;color:#81c784;\"\u003eYes\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eHalf-mask; confirmed compatible per MSA product data\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#1e1e1e;\"\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eAdvantage 200 LS\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eComfo \/ GM bayonet\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;color:#81c784;\"\u003eYes\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eLow-profile half-mask; uses bayonet mount\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eAdvantage 200 \/ 290 \/ 420\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eAdvantage snap-on\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;color:#e57373;\"\u003eNo\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eSnap-on mount — incompatible with GM bayonet cartridges\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#1e1e1e;\"\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eAdvantage 1000\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eAdvantage snap-on\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;color:#e57373;\"\u003eNo\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eSnap-on mount — requires Advantage-series cartridges\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eUltra-Elite (full-face)\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eComfo \/ GM bayonet\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;color:#ffb74d;\"\u003eVerify with MSA\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eConfirm bayonet mount version of facepiece before ordering\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#1e1e1e;\"\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eUltra-Twin (full-face)\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eComfo \/ GM bayonet\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;color:#ffb74d;\"\u003eVerify with MSA\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eConfirm bayonet mount version of facepiece before ordering\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eBrowse the \u003ca href=\"\/collections\/msa-half-mask-respirator\" style=\"color:#4fc3f7;\"\u003eMSA half-mask respirator collection\u003c\/a\u003e and the \u003ca href=\"\/collections\/msa-full-face-mask-respirator\" style=\"color:#4fc3f7;\"\u003eMSA full-face mask respirator collection\u003c\/a\u003e to confirm your mask's connection type before ordering cartridges.\u003c\/p\u003e\n\n\u003c!-- 9. IN-FAMILY COMPARISON TABLE --\u003e\n\u003ch2 style=\"color:#ff9800;\" id=\"gmd-family-comparison\"\u003eMSA GMD vs Other MSA Filters and Cartridges\u003c\/h2\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eAll cartridges below use the same GM bayonet mount and are sold within the \u003ca href=\"\/collections\/msa-respirator-filters-and-cartridges\" style=\"color:#4fc3f7;\"\u003eMSA Respirator Filters \u0026amp; Cartridges\u003c\/a\u003e collection. Choose based on your specific hazard profile.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;background:#1a1a1a;color:#e0e0e0;margin:16px 0;\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth style=\"border:1px solid #444;padding:10px 14px;text-align:left;color:#ffb74d;background:#222;\"\u003eCartridge\u003c\/th\u003e\n      \u003cth style=\"border:1px solid #444;padding:10px 14px;text-align:left;color:#ffb74d;background:#222;\"\u003eHazard Coverage\u003c\/th\u003e\n      \u003cth style=\"border:1px solid #444;padding:10px 14px;text-align:left;color:#ffb74d;background:#222;\"\u003eParticulate?\u003c\/th\u003e\n      \u003cth style=\"border:1px solid #444;padding:10px 14px;text-align:left;color:#ffb74d;background:#222;\"\u003eBest When\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr style=\"background:#222f22;\"\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003e\n\u003ca href=\"\/products\/msa-gmd-ammonia-methylamine-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GMD\u003c\/a\u003e (this product)\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eAmmonia, Methylamine\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eNo\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003ePure vapor hazard, no particulates\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#1e1e1e;\"\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003e\u003ca href=\"\/products\/msa-gmd-p100-ammonia-particulate-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GMD-P100\u003c\/a\u003e\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eAmmonia, Methylamine + P100\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eYes — P100\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eAmmonia vapor + dust\/mist co-hazard\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003e\u003ca href=\"\/products\/msa-gma-organic-vapor-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GMA\u003c\/a\u003e\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eOrganic vapors\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eNo\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eSolvents, hydrocarbons, VOCs\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#1e1e1e;\"\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003e\u003ca href=\"\/products\/msa-gmb-acid-gas-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GMB\u003c\/a\u003e\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eAcid gases (Cl₂, HCl, SO₂, H₂S)\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eNo\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eChlorine, acid gas environments\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003e\u003ca href=\"\/products\/msa-gmc-organic-vapor-acid-gas-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GMC\u003c\/a\u003e\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eOV + Acid gas\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eNo\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eMixed OV and acid gas without particulates\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#1e1e1e;\"\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003e\u003ca href=\"\/products\/msa-gme-multigas-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GME\u003c\/a\u003e\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eOV + Acid gas + Ammonia\/Methylamine\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eNo\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eMixed multi-gas environments\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003e\u003ca href=\"\/products\/msa-gme-p100-multigas-particulate-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GME-P100\u003c\/a\u003e\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eOV + Acid gas + Ammonia + P100\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eYes — P100\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eFull-spectrum vapor + particulate\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#1e1e1e;\"\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003e\u003ca href=\"\/products\/msa-gmt-multi-gas-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GMT\u003c\/a\u003e\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eMulti-gas (alternative formulation)\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eNo\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eVerify specific approval for your hazard class\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003e\u003ca href=\"\/products\/msa-mersorb-p100-mercury-vapor-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA Mersorb P100\u003c\/a\u003e\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eMercury vapor + P100\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eYes — P100\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eMercury vapor environments\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003c!-- 10. 1:1 COMPARISONS --\u003e\n\u003ch2 style=\"color:#ff9800;\" id=\"gmd-vs-gmd-p100\"\u003eMSA GMD vs MSA GMD-P100\u003c\/h2\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eThe \u003ca href=\"\/products\/msa-gmd-p100-ammonia-particulate-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GMD-P100\u003c\/a\u003e is the direct upgrade from the GMD — it combines the identical impregnated sorbent bed for ammonia and methylamine with an integrated P100 particulate filter layer. Choose the GMD when your air-monitoring data confirms no measurable particulate fraction; choose the GMD-P100 whenever aerosols, fertilizer dust, ammonia mist, or any other airborne particles are present. The GMD is the lower-cost option per cartridge; the GMD-P100 eliminates the need for a separate prefilter and provides one-product coverage for combined hazard environments. Both use the same GM bayonet mount.\u003c\/p\u003e\n\n\u003ch2 style=\"color:#ff9800;\" id=\"gmd-vs-gme\"\u003eMSA GMD vs MSA GME Multi-Gas Cartridge\u003c\/h2\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eThe \u003ca href=\"\/products\/msa-gme-multigas-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GME multi-gas cartridge\u003c\/a\u003e covers organic vapors, acid gases, and ammonia\/methylamine in a single unit — the broadest vapor-coverage option in the GM series without a particulate layer. If your facility has mixed chemical exposures (for example, ammonia alongside chlorine or organic solvent vapors), the GME is a more practical choice because a single cartridge covers the spectrum. The GMD is the correct selection when ammonia or methylamine is the \u003cem\u003esole\u003c\/em\u003e vapor hazard, since chemical-specific cartridges can offer a better balance of capacity and cost when the hazard class is unambiguous. Consult the \u003ca href=\"\/blogs\/guides\/respirator-filter-types-explained\" style=\"color:#4fc3f7;\"\u003efilter-types guide\u003c\/a\u003e for a breakdown of multi-gas versus single-hazard cartridge tradeoffs.\u003c\/p\u003e\n\n\u003c!-- 11. QUICK ANSWERS --\u003e\n\u003ch2 style=\"color:#ff9800;\" id=\"gmd-quick-answers\"\u003eMSA GMD Quick Answers\u003c\/h2\u003e\n\n\u003ch3 style=\"color:#ffb74d;\"\u003eWhat is the MSA GMD cartridge used for?\u003c\/h3\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eThe MSA GMD (Part No. 464033) is a NIOSH-approved cartridge for ammonia and methylamine vapor protection, designed for use on MSA Comfo-platform half-masks in environments such as wastewater treatment, commercial refrigeration, fertilizer handling, and chemical manufacturing where these specific vapors are the primary hazard.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#ffb74d;\"\u003eDoes the MSA GMD filter dust or particles?\u003c\/h3\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eNo. The MSA GMD is a vapor-only cartridge with no particulate filtration. When particulates such as fertilizer dust, ammonia aerosol mist, or other airborne solids are present alongside ammonia vapor, the correct product is the \u003ca href=\"\/products\/msa-gmd-p100-ammonia-particulate-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GMD-P100 combination cartridge\u003c\/a\u003e, which adds a P100 filter layer.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#ffb74d;\"\u003eWhat respirators fit the MSA GMD cartridge?\u003c\/h3\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eThe MSA GMD uses a threaded bayonet (quarter-turn) mount compatible with the MSA Comfo Classic (Hycar and Silicone), Comfo II, and Advantage 200 LS half-masks. It is not compatible with Advantage 200, 290, 420, or 1000 series respirators, which use a different snap-on connection system.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#ffb74d;\"\u003eHow many cartridges come in a box?\u003c\/h3\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eThe MSA GMD is sold in a box of 10 cartridges (Part No. 464033) at $179.63, which works out to $17.96 per cartridge. This pack size suits team-level respiratory protection programs and facility stocking requirements.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#ffb74d;\"\u003eWhat protection factor does the MSA GMD provide?\u003c\/h3\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eWhen used on a properly fit-tested half-mask respirator, the MSA GMD provides an Assigned Protection Factor (APF) of 10 under OSHA 29 CFR 1910.134, meaning it is suitable for airborne concentrations up to 10 times the applicable permissible exposure limit (PEL) or threshold limit value (TLV). Your industrial hygienist must confirm that measured concentrations remain within this band.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#ffb74d;\"\u003eIs the MSA GMD NIOSH-approved?\u003c\/h3\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eYes. The MSA GMD is NIOSH-approved under 42 CFR Part 84 for ammonia and methylamine vapor service. The NIOSH approval confirms that the cartridge meets federal efficacy standards for the stated hazard classes when used on approved respirator platforms.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#ffb74d;\"\u003eHow do I know when to replace the MSA GMD cartridge?\u003c\/h3\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eThe MSA GMD does not have an end-of-service-life indicator (ESLI). Replace cartridges on a scheduled change-out program established by your industrial hygienist based on contaminant concentration, work duration, temperature, and humidity. Cartridges should also be replaced immediately if ammonia odor is detected through the respirator, as this indicates sorbent saturation.\u003c\/p\u003e\n\n\u003c!-- 12. SPECIFICATIONS --\u003e\n\u003ch2 style=\"color:#ff9800;\" id=\"gmd-specifications\"\u003eMSA GMD Ammonia \/ Methylamine Cartridge Specifications\u003c\/h2\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;background:#1a1a1a;color:#e0e0e0;margin:16px 0;\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;color:#ffb74d;width:40%;font-weight:bold;\"\u003ePart Number \/ SKU\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003e464033\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#1e1e1e;\"\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;color:#ffb74d;font-weight:bold;\"\u003eGTIN\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003e0641817007532\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;color:#ffb74d;font-weight:bold;\"\u003eBrand\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eMSA Safety\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#1e1e1e;\"\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;color:#ffb74d;font-weight:bold;\"\u003eHazard Class\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eAmmonia \/ Methylamine vapor\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;color:#ffb74d;font-weight:bold;\"\u003eNIOSH Approval\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003e42 CFR Part 84, Ammonia and Methylamine service\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#1e1e1e;\"\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;color:#ffb74d;font-weight:bold;\"\u003eParticulate Filtration\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eNone\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;color:#ffb74d;font-weight:bold;\"\u003eESLI\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eNo\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#1e1e1e;\"\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;color:#ffb74d;font-weight:bold;\"\u003eMount \/ Connection\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eGM bayonet (threaded quarter-turn), MSA Comfo platform\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;color:#ffb74d;font-weight:bold;\"\u003eAssigned Protection Factor\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eAPF 10 (half-mask, OSHA 29 CFR 1910.134)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#1e1e1e;\"\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;color:#ffb74d;font-weight:bold;\"\u003ePack Quantity\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003e10 cartridges per box\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;color:#ffb74d;font-weight:bold;\"\u003ePrice Per Box\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003e$179.63 (10-pack)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#1e1e1e;\"\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;color:#ffb74d;font-weight:bold;\"\u003ePrice Per Cartridge\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003e$17.96\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;color:#ffb74d;font-weight:bold;\"\u003eCompatible Respirators\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eComfo Classic (Hycar), Comfo Classic (Silicone), Comfo II, Advantage 200 LS\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#1e1e1e;\"\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;color:#ffb74d;font-weight:bold;\"\u003eAmazon ASIN\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #444;padding:10px 14px;\"\u003eB005QQDMEE\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003c!-- 13. HELPFUL BUYING GUIDES --\u003e\n\u003ch2 style=\"color:#ff9800;\" id=\"gmd-buying-guides\"\u003eHelpful Buying Guides\u003c\/h2\u003e\n\u003cul style=\"color:#e0e0e0;\"\u003e\n  \u003cli\u003e\u003ca href=\"\/blogs\/guides\/how-to-choose-a-respirator-cartridge\" style=\"color:#4fc3f7;\"\u003eHow to Choose a Respirator Cartridge — Complete Selection Guide\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/blogs\/guides\/respirator-filter-types-explained\" style=\"color:#4fc3f7;\"\u003eRespirator Filter Types Explained — Particulate, Vapor, and Combination\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/blogs\/guides\/respirator-cartridge-color-chart\" style=\"color:#4fc3f7;\"\u003eRespirator Cartridge Color-Code Chart — NIOSH Color Band Reference\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/blogs\/guides\/organic-vapor-vs-p100\" style=\"color:#4fc3f7;\"\u003eOrganic Vapor vs P100 — When to Use Each Filter Type\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/blogs\/guides\/best-respirator-for-silica-dust-2026\" style=\"color:#4fc3f7;\"\u003eBest Respirator for Silica Dust 2026 — Buyer's Guide\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/blogs\/guides\/best-respirator-for-welding-fumes\" style=\"color:#4fc3f7;\"\u003eBest Respirator for Welding Fumes — Top Picks and Selection Tips\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c!-- 14. FAQs --\u003e\n\u003ch2 style=\"color:#ff9800;\" id=\"gmd-faq\"\u003eMSA GMD Ammonia \/ Methylamine Cartridge — Frequently Asked Questions\u003c\/h2\u003e\n\n\u003ch3 style=\"color:#ffb74d;\"\u003eCan I use the MSA GMD on my MSA Advantage 200 half-mask?\u003c\/h3\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eNo. The Advantage 200 (and 290, 420, 1000 series) uses a snap-on mount that is mechanically different from the GM bayonet connection on the GMD. Mounting the wrong cartridge to an incompatible respirator creates a leak path that defeats respiratory protection. If you own an Advantage-series mask, check the \u003ca href=\"\/collections\/msa-respirator-filters-and-cartridges\" style=\"color:#4fc3f7;\"\u003eMSA Respirator Filters \u0026amp; Cartridges collection\u003c\/a\u003e for Advantage-compatible options.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#ffb74d;\"\u003eDoes the MSA GMD protect against hydrogen sulfide (H₂S)?\u003c\/h3\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eNo. The GMD sorbent bed is engineered specifically for ammonia and methylamine — it is not NIOSH-approved for hydrogen sulfide. H₂S requires a cartridge with acid gas approval; the \u003ca href=\"\/products\/msa-gmb-acid-gas-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GMB acid gas cartridge\u003c\/a\u003e or a combination unit such as the \u003ca href=\"\/products\/msa-gme-multigas-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GME multi-gas cartridge\u003c\/a\u003e are appropriate choices for H₂S environments.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#ffb74d;\"\u003eHow many cartridges does a worker need per shift?\u003c\/h3\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eCartridge consumption depends on ammonia concentration, temperature, humidity, and work duration. Your industrial hygienist must establish a written change-schedule as required by OSHA 29 CFR 1910.134(d)(3)(iii)(B). In moderate-exposure, short-duration tasks a single pair of cartridges per shift is common, but there is no universal rule. Always follow your facility's written program.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#ffb74d;\"\u003eCan I add a prefilter to the MSA GMD for dust protection?\u003c\/h3\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eThe MSA GMD is a vapor-only cartridge with no integral prefilter attachment point for P100 media. When both ammonia vapor and particulates are present, the correct product is the \u003ca href=\"\/products\/msa-gmd-p100-ammonia-particulate-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GMD-P100 combination cartridge\u003c\/a\u003e, which has the P100 layer built in.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#ffb74d;\"\u003eIs the GMD cartridge rated for chlorine gas?\u003c\/h3\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eNo. Chlorine is an acid gas, and the GMD sorbent is not approved for acid gases under NIOSH 42 CFR Part 84. For chlorine or other acid gas hazards, use the \u003ca href=\"\/products\/msa-gmb-acid-gas-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GMB acid gas cartridge\u003c\/a\u003e or, for combined chlorine and ammonia exposure, the \u003ca href=\"\/products\/msa-gme-multigas-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GME multi-gas cartridge\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#ffb74d;\"\u003eWhat is the shelf life of an unopened MSA GMD cartridge?\u003c\/h3\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eMSA impregnated cartridges have a manufacturer-stated shelf life when stored unopened in original packaging under recommended conditions (cool, dry environment away from contaminants). Check the lot date code printed on the cartridge or box and follow MSA's published storage guidance. Do not use cartridges past their marked expiration date.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#ffb74d;\"\u003eDoes the GMD protect against trimethylamine or other higher amines?\u003c\/h3\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eThe NIOSH approval for the GMD covers ammonia and methylamine specifically. Other amines such as trimethylamine, dimethylamine, or ethylamine are not explicitly included in the 42 CFR Part 84 approval designation for this cartridge. Consult MSA Safety's technical team and your industrial hygienist before using the GMD for amine compounds beyond the two listed hazard classes. For broader chemical coverage, evaluate the \u003ca href=\"\/products\/msa-gme-multigas-cartridge\" style=\"color:#4fc3f7;\"\u003eMSA GME multi-gas cartridge\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#ffb74d;\"\u003eHow do I perform a seal check with the MSA GMD installed?\u003c\/h3\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eWith the GMD cartridges installed on your Comfo-platform mask, perform a negative-pressure user seal check: block the cartridge inlet openings with your palms and inhale gently — the facepiece should collapse slightly and hold without air leaking in at the face seal. Alternatively, perform a positive-pressure check by blocking the exhalation valve and exhaling gently. Any leakage at the facepiece indicates a poor seal requiring adjustment or a different size mask.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#ffb74d;\"\u003eCan the GMD be reused across multiple shifts?\u003c\/h3\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eCartridges can be reused across multiple shifts provided the change schedule established by your industrial hygienist has not been reached, the cartridge has been stored in a sealed plastic bag between uses to minimize exposure to ambient contaminants, and no damage, odor breakthrough, or visible contamination has occurred. Single-use cartridges that have reached their service life must be discarded.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#ffb74d;\"\u003eDoes the MSA GMD include the respirator facepiece?\u003c\/h3\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eNo. The MSA GMD is sold as a pack of 10 cartridges only. The compatible Comfo-platform facepieces — Comfo Classic, Comfo II, and Advantage 200 LS — are sold separately. See the \u003ca href=\"\/collections\/msa-half-mask-respirator\" style=\"color:#4fc3f7;\"\u003eMSA half-mask respirator collection\u003c\/a\u003e to select and purchase a compatible facepiece.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#ffb74d;\"\u003eWhat is the difference between the MSA GMD and the MSA 3M 6004 ammonia cartridge?\u003c\/h3\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eBoth the MSA GMD and the \u003ca href=\"\/collections\/3m-respirator-filters-and-cartridges\" style=\"color:#4fc3f7;\"\u003e3M 6004 ammonia\/methylamine cartridge\u003c\/a\u003e are NIOSH-approved for the same hazard class, but they use entirely different connection systems. The MSA GMD uses the GM bayonet mount and only fits MSA Comfo-platform respirators. The 3M 6004 uses 3M's bayonet connection and only fits 3M 6000\/7000-series respirators. These cartridges are not interchangeable between brands.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#ffb74d;\"\u003eIs the MSA GMD available in a single-cartridge purchase?\u003c\/h3\u003e\n\u003cp style=\"color:#e0e0e0;\"\u003eThe MSA GMD (Part No. 464033) is sold as a 10-pack unit. Single-cartridge purchasing is not available at WC Safety for this product. The 10-pack pricing at $17.96 per cartridge is competitive for facilities that stock cartridges for multiple workers or rotate inventory regularly.\u003c\/p\u003e\n\n\u003c!-- CTA (post-FAQ) --\u003e\n\u003cp style=\"margin-top:24px;\"\u003e\n  \u003ca href=\"https:\/\/www.amazon.com\/dp\/B005QQDMEE?tag=wcsafety04-20\" style=\"display:inline-block;background:#ff9800;color:#1a1a1a;padding:10px 20px;border-radius:4px;text-decoration:none;font-weight:bold;margin:4px 8px 4px 0;\"\u003eBuy on Amazon\u003c\/a\u003e\n  \u003ca href=\"\/products\/msa-gmd-ammonia-methylamine-cartridge\" style=\"display:inline-block;background:#2a2520;color:#ff9800;border:2px solid #ff9800;padding:10px 20px;border-radius:4px;text-decoration:none;font-weight:bold;margin:4px 0;\"\u003eShop WC Safety\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003c!-- 15. FOOTER E-E-A-T TRUST STACK --\u003e\n\u003cdiv style=\"border-top:1px solid #444;margin-top:32px;padding-top:16px;font-size:0.85em;color:#aaa;\"\u003e\n  \u003cp\u003eWritten by \u003cstrong style=\"color:#ffb74d;\"\u003eSteven Eaton\u003c\/strong\u003e, WC Safety Editorial — industrial hygiene \u0026amp; PPE selection specialist. Reviewed by the WC Safety Editorial Team. | \u003ca href=\"\/collections\/msa-respirator-filters-and-cartridges\" style=\"color:#4fc3f7;\"\u003eMSA Respirator Filters \u0026amp; Cartridges\u003c\/a\u003e | \u003ca href=\"\/blogs\/guides\/how-to-choose-a-respirator-cartridge\" style=\"color:#4fc3f7;\"\u003eRespirator Selection Guide\u003c\/a\u003e\u003c\/p\u003e\n  \u003cp style=\"font-size:0.9em;\"\u003eManufacturer specifications sourced from MSA Safety published data. WC Safety is an authorized MSA Safety retailer. Always verify cartridge compatibility with your specific respirator model before use.\u003c\/p\u003e\n  \u003cp style=\"font-size:0.85em;color:#888;margin-top:8px;\"\u003e\u003cem\u003eWC Safety participates in the Amazon Associates program. Amazon links on this page are affiliate links — we may earn a commission at no added cost to you.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"MSA Safety","offers":[{"title":"Default Title","offer_id":44064797687896,"sku":"464033","price":179.63,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0594\/1900\/0920\/files\/464033.jpg?v=1777874458","url":"https:\/\/wcsafety.com\/products\/msa-gmd-ammonia-methylamine-cartridge","provider":"WC Safety","version":"1.0","type":"link"}