MSA Cartridge Review

Is the MSA 806059 GMT Multi-Gas Cartridge the right choice for nuclear and tritium environments?

Short answer: Yes — if your exposure profile includes tritium or nuclear fuel cycle work, the MSA GMT is the only MSA Comfo-platform cartridge engineered with a tritium-impregnated sorbent bed. It delivers the same nine-gas inorganic protection as the MSA GME, then adds a specialized sorbent layer no other Comfo-series cartridge carries. For workers outside nuclear environments who simply need broad inorganic-gas protection, the GME covers the same matrix at a much lower cost.

Published to MSA respirator filters and cartridges · /blogs/product-reviews/msa-806059-gmt-multi-gas-cartridge-review

The MSA GMT sits at the top of the Comfo-platform inorganic-gas cartridge lineup — not because it outperforms the MSA GME for standard industrial use, but because it adds a tritium-impregnated sorbent bed that no other cartridge in the MSA Comfo series offers. The nine covered gases — chlorine, sulfur dioxide, hydrogen sulfide, ammonia, methylamine, hydrogen chloride, hydrogen fluoride, formaldehyde, and chlorine dioxide — are identical between GMT and GME. The price difference of roughly $37 per pair reflects that specialized nuclear-grade sorbent layer, not incremental hazard coverage.

This review evaluates the MSA 806059 GMT for buyers already familiar with the Comfo bayonet platform — typically safety managers at nuclear fuel cycle facilities, heavy-water reactor plants, or tritium research labs selecting cartridges for an existing MSA Advantage 200 LS or Ultra-Elite program. We compare it head-to-head with its siblings, explain when its premium is justified, and flag when you should step down to the GME instead.

Who the MSA GMT is for

• Nuclear fuel cycle facility workers — uranium hexafluoride (UF₆) handling and conversion operations where inorganic acid gases and tritium co-exist
• Heavy-water reactor maintenance crews — tritium (HTO) is a primary handling concern in CANDU and similar reactor maintenance programs
• Tritium research laboratory personnel — academic and national laboratory researchers working with tritiated compounds
• Nuclear power plant maintenance — shutdown and refueling maintenance teams where tritiated water vapor exposure is documented in the IH program
• Any facility where the industrial hygienist's written program specifies a tritium-specific sorbent cartridge for the MSA Comfo platform

Outside nuclear/tritium environments, the broader inorganic-gas market is better served by the MSA GME — same nine-gas matrix, dramatically lower cost. Browse the full MSA respirator filters and cartridges collection to compare all Comfo-series options.

What the MSA GMT does well

Tritium-specific sorbent — a genuine engineering differentiator

The GMT's defining feature is its tritium-impregnated sorbent bed. This is not a marketing label for "extra inorganic coverage" — it is a distinct sorbent material selected specifically for its affinity toward tritiated compounds that would pass through standard activated-carbon beds. The tritium concern in nuclear environments is primarily tritiated water vapor (HTO), a form of water where hydrogen is replaced with tritium. Standard acid-gas cartridges are not tested or rated for HTO uptake. The GMT's sorbent addresses this gap within the MSA Comfo platform. If your facility's IH program requires documented tritium-specific cartridge protection, the GMT is the answer on the Comfo mount; the GME is not a substitute.

Nine-gas inorganic matrix — broad coverage in one cartridge

The GMT covers chlorine (Cl₂), sulfur dioxide (SO₂), hydrogen sulfide (H₂S), ammonia (NH₃), methylamine (CH₃NH₂), hydrogen chloride (HCl), hydrogen fluoride (HF), formaldehyde (HCHO), and chlorine dioxide (ClO₂). Nuclear facilities routinely handle HF in uranium conversion; ammonia appears in cooling systems; chlorine dioxide in water treatment adjacent to operations. The single-cartridge coverage simplifies the respiratory protection program for facilities where multiple inorganic gases are present simultaneously.

Full NIOSH 42 CFR Part 84 approval

The GMT carries NIOSH approval under 42 CFR Part 84, independently verified on the NIOSH Certified Equipment List (CEL). For nuclear facilities operating under NRC or DOE regulatory oversight, NIOSH approval is a program baseline; self-certified or unapproved cartridges do not satisfy written program requirements under 29 CFR 1910.134.

Comfo bayonet compatibility across the platform family

The GMT fits every Comfo-bayonet facepiece MSA makes: Comfo Classic, Comfo II, Advantage 200 LS, Ultra-Twin, and Ultra-Elite. Nuclear programs frequently run mixed fleets — half-mask for lower-exposure maintenance tasks, full-face for higher-exposure environments. The GMT's single-mount compatibility lets a program stock one cartridge SKU across multiple facepiece tiers, simplifying inventory and change-out scheduling.

APF 50 with Ultra-Elite full-face

When paired with the MSA Ultra-Elite full-face respirator, the GMT system achieves APF 50 — allowing use at up to 50x the applicable TLV or PEL. For HF, NH₃, and ClO₂, all of which carry extremely low permissible exposure limits, APF 50 is often the minimum acceptable protection factor in active nuclear operations. Half-mask Comfo platforms deliver APF 10.

Drop-in replacement for existing Comfo programs

Facilities already using GME cartridges for routine inorganic protection can step up to GMT without replacing facepieces, fit-test records, or training documentation — the cartridge swap is transparent to the program's facepiece inventory. The GME review covers the standard inorganic program in detail.

Where the MSA GMT falls short

No combined P100 particulate stage

The GMT is a gas-phase cartridge only. Nuclear environments with airborne alpha or beta particulates — including plutonium oxide dust, uranium particulate during grinding operations, or tritium aerosols — require supplemental P100 filtration. The MSA Low-Profile P100 filter stacks over the GMT cartridge on Comfo facepieces to address this. The GME-P100 combination cartridge integrates both in one unit — but that cartridge lacks the tritium sorbent bed, so it is not a substitute for the GMT in tritium programs requiring both gas and particulate protection simultaneously.

No end-of-service-life indicator (ESLI)

The GMT carries no ESLI. This is standard across MSA's Comfo cartridge line, but it is a notable limitation for nuclear IH programs where breakthrough cannot be detected by odor for several of the covered gases. OSHA 29 CFR 1910.134 Appendix B requires a documented change-out schedule based on objective data — measured air concentrations, cartridge service-life calculations from manufacturer data, or direct-reading instrument monitoring — when no ESLI is present. Programs relying on sensory detection to trigger change-out are not in compliance.

Premium price relative to the GME

At $39.47 per cartridge vs. approximately $2.45 per cartridge for the GME, the GMT carries a significant premium. For facilities that do not have a documented tritium exposure component in their IH program, purchasing GMT cartridges adds cost without adding protection. The selection question is binary: if tritium sorbent is in the written program, buy GMT; if not, buy GME.

Does not protect against organic vapors, particulates, or radioiodine

The GMT's nine-gas inorganic matrix does not extend to organic vapors (gasoline, solvents, chlorinated hydrocarbons), particulates, or radioiodine. Nuclear facilities requiring radioiodine protection — particularly I-131 in nuclear medicine or reactor operations — should evaluate the MSA GMI iodine/P100 cartridge instead. See the GMI review for a full comparison.

MSA GMT vs. the competitive set

Prices per cartridge. GME per-unit estimate based on current list pricing.

MSA GME on Amazon MSA GME-P100 on Amazon MSA GMI on Amazon

Comfo multi-gas family comparison

• Buy the GME (492790) if your IH program covers standard inorganic gases (Cl₂, HF, H₂S, SO₂, etc.) with no tritium component — the same nine gases at a fraction of the cost.
• Buy the GME-P100 (815182) if your program requires combined gas + particulate protection in a single cartridge and tritium is not a documented exposure hazard.
• Buy the GMT (806059) if your written respirator program specifies tritium sorbent protection — nuclear fuel cycle, heavy-water reactor maintenance, tritium research labs.

Shop the Comfo multi-gas series on Amazon → MSA GME MSA GME-P100 MSA GMT

Compatible respirators for the MSA GMT

The MSA 806059 GMT uses the GM-series bayonet mount common to all Comfo-platform facepieces. Confirmed compatible respirators include:

• MSA Comfo Classic — legacy half-mask, still active in many plant programs
• MSA Comfo II — updated half-mask with silicone facepiece; APF 10
• MSA Advantage 200 LS — current production half-mask with low-profile bayonet; APF 10
• MSA Ultra-Twin — full-face dual-cartridge; APF 50
• MSA Ultra-Elite — full-face single-cartridge; APF 50; recommended for nuclear work where face-seal integrity is paramount

Not compatible: MSA Advantage 200, 290, 420, 1000, or 3000 series (snap-on mount); any 3M, Moldex, or other brand facepiece. Cross-brand cartridge mixing is not permitted under 29 CFR 1910.134 — use only the facepiece/cartridge combination as NIOSH-approved.

Top compatible respirators on Amazon → MSA Advantage 200 LS MSA Ultra-Elite

Where the GMT fits in the Comfo cartridge lineup

The Comfo bayonet family covers seven chemical matrices across twelve cartridge SKUs — organic vapor (GMA), acid gas (GMB), organic vapor + acid gas (GMC), ammonia/methylamine (GMD), multi-gas inorganic (GME), multi-gas + tritium (GMT), and radioiodine + P100 (GMI). Each matrix is distinct; the GMT occupies the narrow nuclear/tritium niche.

Nuclear facilities typically run two or three cartridge types simultaneously: GMT for tritium/inorganic-gas zones, GMI for radioiodine zones (see the GMI review), and Low-Profile P100 filters stacked over cartridges in dusty or particulate-generating tasks. Understanding the matrix overlap — and the gaps — is the core of a sound nuclear respiratory protection program.

The Advantage snap-on platform runs parallel cartridges covering many of the same matrices. The Advantage GME covers the same nine inorganic gases for Advantage facepiece users, but there is no Advantage-platform equivalent of the GMT's tritium sorbent — the GMT is Comfo-exclusive.

Total cost of ownership

The MSA 806059 GMT sells in a 2-pack at $78.93, making each cartridge $39.47. Because nuclear programs almost universally require a documented change-out schedule (not sensory detection), the per-cartridge cost must be planned against shift exposure profiles. At a conservative single-shift change-out for an 8-hour exposure day:

• Daily cartridge cost (two cartridges per shift): ~$78.93
• Annual cost per worker (250 working days, full daily change-out): ~$19,733 — substantially above the GME program cost
• More realistic semi-shift or multi-day schedule (per industrial hygienist program documentation): consult your CIH and the MSA Technical Data Sheet for service life at your measured concentrations; cost scales proportionally

This cost context underscores why the GMT is appropriate only where the IH program specifically requires its tritium sorbent. The GME at ~$2.45 per cartridge reduces consumable cost dramatically for facilities without a tritium exposure component. Stacking the Low-Profile P100 filter over the GMT adds particulate protection when needed without replacing the cartridge mid-shift in mixed-hazard environments.

Final verdict

The MSA 806059 GMT earns its 4.5/5 rating because it does one thing no other Comfo-series cartridge does: deliver nine-gas inorganic protection with a tritium-impregnated sorbent bed on the industry-standard Comfo bayonet mount. For nuclear fuel cycle workers, tritium researchers, and heavy-water reactor maintenance crews, it is the correct specification and the decision is straightforward.

• Buy the GMT (806059) if your written respirator program specifies tritium sorbent protection for the Comfo platform.
• Buy the GME (492790) if you need the same nine inorganic gases without a tritium hazard component — the savings are substantial.
• Buy the GME-P100 (815182) if you need gas + particulate in one unit and tritium is not in the program.
• Buy the GMI (815184) if radioiodine (I₂, CH₃I) is the primary nuclear medicine or reactor maintenance exposure.

VIEW ON WC SAFETY → CHECK PRICE ON AMAZON →

MSA GMT Cartridge — Frequently Asked Questions

What gases does the MSA 806059 GMT cartridge protect against?

The MSA GMT provides protection against nine inorganic gases: chlorine (Cl₂), sulfur dioxide (SO₂), hydrogen sulfide (H₂S), ammonia (NH₃), methylamine (CH₃NH₂), hydrogen chloride (HCl), hydrogen fluoride (HF), formaldehyde (HCHO), and chlorine dioxide (ClO₂). It also incorporates a tritium-impregnated sorbent bed for use in tritium and nuclear fuel cycle environments. It does not protect against organic vapors, particulates, radioiodine, mercury, carbon monoxide, or oxygen-deficient atmospheres.

MSA GMT vs. GME — what is the actual difference?

The nine covered inorganic gases are identical between the GMT and the GME. The GMT adds a tritium-impregnated sorbent bed that the GME does not have. If your facility's IH program has no tritium exposure component, the GME covers the same gas matrix at a dramatically lower cost (~$2.45 vs. $39.47 per cartridge). The GMT premium is only justified when tritium sorbent protection is a written program requirement. See the full GME review for the standard inorganic program analysis.

Is the MSA GMT approved by NIOSH?

Yes. The MSA 806059 GMT is approved under NIOSH 42 CFR Part 84. Approval status can be independently verified on the NIOSH Certified Equipment List (CEL). Cross-referencing the CEL is essential for nuclear facilities operating under NRC or DOE regulatory frameworks, where NIOSH-approved equipment is a program baseline under 29 CFR 1910.134.

What respirators is the MSA GMT compatible with?

The GMT uses the MSA GM-series bayonet mount and is compatible with Comfo Classic, Comfo II, Advantage 200 LS, Ultra-Twin, and Ultra-Elite. It is not compatible with any MSA Advantage snap-on facepiece (200, 290, 420, 1000, 3000) or with 3M or Moldex facepieces.

Can the GMT be used with a half-mask for nuclear work?

Yes, but the protection factor determines the allowable use concentration. A half-mask (Comfo Classic, Comfo II, Advantage 200 LS) delivers APF 10 — permitting use at up to 10x the applicable TLV or PEL. For higher-concentration or higher-risk nuclear environments, the Ultra-Elite full-face with the GMT delivers APF 50. The written respirator program must specify the required APF based on measured air concentrations; selecting the facepiece tier is the program administrator's and CIH's decision, not the cartridge manufacturer's.

Does the GMT have an end-of-service-life indicator (ESLI)?

No. The MSA 806059 GMT does not have an ESLI. Under OSHA 29 CFR 1910.134 Appendix B, absence of an ESLI requires a documented change-out schedule based on objective data — air monitoring results, service-life modeling, or a conservative worst-case schedule. Programs relying on odor breakthrough detection for cartridge change-out are not compliant and are potentially exposing workers to chemical concentrations above the cartridge's capacity without sensory warning.

Is the GMT suitable for tritiated water vapor (HTO)?

The GMT's tritium-impregnated sorbent bed is specifically designed for tritium environments including HTO, which is the primary tritium exposure form in heavy-water reactor maintenance. Standard acid-gas or inorganic-gas cartridges without the specialized sorbent are not rated for HTO uptake. Consult the MSA Technical Data Sheet and your facility's radiological engineering staff for program-specific sorbent capacity data at your measured HTO concentrations.

Can I add a P100 filter to the GMT for combined gas and particulate protection?

Yes. The MSA Low-Profile P100 filter stacks over GMT cartridges on Comfo bayonet facepieces, adding NIOSH-rated P100 particulate filtration (≥99.97% efficiency) for environments with both gas-phase and particulate hazards. This is the correct approach when simultaneous gas + particulate protection is needed alongside the GMT's tritium sorbent — the GME-P100 combination cartridge is not a substitute because it lacks the tritium sorbent bed.

What is the MSA GMT's GTIN / UPC?

The GTIN for MSA 806059 is 0816687297684. Verify this against the MSA Technical Data Sheet or current product packaging before entering in a purchasing system — GTINs occasionally change on reformulation or repackaging.

How does the GMT differ from the MSA GMI radioiodine cartridge?

The GMI is purpose-built for elemental iodine (I₂) and methyl iodide (CH₃I) with an integrated P100 stage — the use case is nuclear medicine, reactor iodine monitoring, and thyroid cancer treatment preparation. The GMT covers nine inorganic gases with a tritium sorbent; it does not protect against radioiodine. The GMI does not have a tritium sorbent. In a nuclear power plant, both cartridge types may be in active use simultaneously for different zones or tasks. See the GMI review for the detailed radioiodine comparison.

Is the GMT the same as the MERSORB cartridge?

No. The MERSORB (SKU 815185) is a completely different cartridge using MERSORB sorbent technology for elemental mercury vapor (Hg⁰) and chlorine, with an integrated P100 stage. The GMT covers nine inorganic gases with a tritium sorbent and no P100 stage. They address entirely different exposure profiles. See the MERSORB review for the mercury vapor program analysis.

What is the Assigned Protection Factor (APF) for the GMT?

The APF is determined by the facepiece, not the cartridge. Half-mask Comfo facepieces (Comfo Classic, Comfo II, Advantage 200 LS) yield APF 10. Full-face facepieces (Ultra-Twin, Ultra-Elite) yield APF 50. The GMT cartridge is compatible with both tiers; program requirements dictate which APF is necessary.

How often should I change MSA GMT cartridges?

There is no universal change-out interval. MSA and OSHA 29 CFR 1910.134 Appendix B require the schedule to be derived from air monitoring data, cartridge service-life modeling at measured concentrations, or a worst-case conservative schedule developed by a CIH. Nuclear programs typically use direct-reading instruments and dosimetry data to establish shift-specific change-out intervals. Without this data, a conservative end-of-shift change-out is the default, but this approach must be documented in the written respirator program.

Does the MSA GMT protect against organic vapors?

No. The GMT's sorbent matrix is designed for inorganic gases. Organic vapors (solvents, hydrocarbons, chlorinated organic compounds) require an activated-carbon OV cartridge such as the MSA GMA or combined OV/acid gas MSA GMC. Nuclear environments with mixed organic/inorganic hazards require a separate program evaluation; there is no single Comfo cartridge that combines OV coverage with the GMT's tritium sorbent.

Is the GMT compatible with the MSA Advantage snap-on respirators?

No. The GMT uses the GM-series bayonet mount, which is physically incompatible with the snap-on mount used by the MSA Advantage 200, 290, 420, 1000, and 3000 series. Advantage platform users requiring multi-gas inorganic protection should use the MSA Advantage GME cartridge. There is currently no Advantage-platform equivalent of the GMT's tritium sorbent bed.

Can the GMT be used in IDLH atmospheres?

No. Air-purifying cartridge respirators — including the GMT — are prohibited in IDLH (immediately dangerous to life or health) atmospheres, oxygen-deficient atmospheres (below 19.5% O₂), or any atmosphere with unknown composition. IDLH conditions require supplied-air respirators (SCBA or SAR) per OSHA 29 CFR 1910.134(d)(2). Nuclear environments with potential IDLH scenarios must have SCBA programs in place; the GMT is a complement to, not a replacement for, that program element.