MSA 464031 GMA Organic Vapor Cartridge Review (4.3/5)

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Is the MSA 464031 GMA Organic Vapor Cartridge the right choice for your spray painting or solvent work?

Short answer: Yes — if your exposure profile is organic vapors only and you're already running the MSA Comfo platform. The MSA 464031 GMA is a cost-effective, NIOSH-approved OV cartridge that delivers solid activated-carbon protection for painters, parts cleaners, and solvent handlers. The key qualification: it provides zero particulate filtration, no acid-gas coverage, and requires a written change schedule in the absence of an end-of-service-life indicator. If your work combines solvents with dusts, mists, or aerosols — or if you use any respirator other than a Comfo Classic, Comfo II, Ultra-Twin, or Ultra-Elite — this cartridge is not your answer. Look at the MSA 815178 GMA-P100 for the dual-hazard upgrade or the MSA 464046 GMC for acid-gas coverage.

The MSA 464031 GMA sits at the entry point of the MSA Comfo-platform cartridge lineup — pure organic vapor protection, no add-ons, no upsells. For industrial buyers sourcing replacement cartridges for an established Comfo-series respirator program, that simplicity is the value proposition: a single-hazard OV cartridge at $11.55 per unit, available in box-of-10 quantities, NIOSH-approved under 42 CFR Part 84.

This review covers the 464031's protection scope, Comfo-platform compatibility, documented service-life limitations, and how it stacks against both the MSA 815178 GMA-P100 (the P100 upgrade) and the 3M 6001 (the dominant competitor OV cartridge on this site). It is written for safety managers, EHS coordinators, and field buyers who need a fact-based procurement decision — not a marketing overview.

Who the MSA 464031 GMA Is For

The GMA is the right cartridge for a narrow but common buyer profile. If your hazard assessment confirms organic vapors as the sole inhalation risk, you run Comfo-platform respirators, and your change schedule is documented, this cartridge does its job at the lowest cost in the MSA Comfo cartridge family. Specific fits:

• Industrial spray painters applying solvent-borne coatings in ventilated booths where particulate (atomized paint) is filtered upstream by the booth system rather than the cartridge
• Solvent degreasing and parts-cleaning operations — IPA, acetone, MEK, naphtha, and similar solvents with no concurrent aerosol or dust hazard
• Automotive refinishing technicians operating in compliance paint booths with separate particulate controls
• Chemical handling and transfer operations involving organic-vapor-class chemicals where a CIH has confirmed no acid-gas or particulate co-exposure
• Safety programs replacing aging Comfo-platform cartridge stock where platform standardization on the Comfo line is already established

Browse the full MSA respirator filters and cartridges collection for the complete Comfo and Advantage platform lineup.

What the MSA 464031 GMA Does Well

1. Reliable OV Protection Within Its Rated Scope

The 464031 uses an activated-carbon sorbent bed to capture organic vapors — aromatic hydrocarbons, aliphatic solvents, chlorinated compounds, and ketones covered under the NIOSH OV classification. For the buyer whose CIH has signed off on an organic-vapor-only exposure profile, this cartridge meets the regulatory minimum without overspecifying. The NIOSH Certified Equipment List confirms the approval against 42 CFR Part 84, and the manufacturer's technical data confirms activated-carbon construction consistent with standard OV cartridge practice across the industry.

2. Lowest Per-Unit Cost in the MSA Comfo Cartridge Family

At $11.55 per cartridge in a box of 10 ($115.50 per box), the GMA is the entry point of the Comfo-platform cartridge stack. The MSA 815178 GMA-P100 runs $20.10 each — a $8.55 per-unit premium for the P100 particulate layer. For single-hazard OV programs with high cartridge turnover (measured change schedules, high-exposure workplaces), the cost differential is real and worth controlling when the hazard assessment genuinely supports the GMA's narrower scope.

3. Positive-Lock Bayonet Mount — No Seat Uncertainty

The GM-series bayonet uses a threaded quarter-turn engagement that seats with an audible/tactile click on all Comfo-platform respirators. Unlike snap-on filter systems (MSA Advantage, some 3M frames), the bayonet mount cannot be finger-seated partially — the quarter-turn mechanism either locks or it doesn't. For compliance officers running respirator inspection programs, that's a meaningful difference: a seated GMA cartridge is verifiably seated.

4. Dual Half-Mask and Full-Facepiece Coverage on One SKU

One cartridge SKU serves all MSA Comfo-platform respirators: Comfo Classic half-mask, Comfo II half-mask, Ultra-Twin full-facepiece, and MSA Ultra-Elite Full Facepiece. This simplifies procurement and eliminates the need to stock separate SKUs for half-mask versus full-facepiece wearers in the same program — both employees draw from the same cartridge box.

5. Straightforward Upgrade Path Within the Same Platform

If a hazard reassessment reveals concurrent particulate exposure (aerosols, paint mist, metal dust), the upgrade from GMA to MSA 815178 GMA-P100 requires no respirator change — same bayonet mount, same platform. Similarly, if acid-gas co-exposure is identified, the MSA 464046 GMC slots in without re-fitting employees or replacing equipment. That upgrade economics argument — protect the respirator capital investment while changing only consumables — is part of the case for standardizing on the Comfo platform.

Where the MSA 464031 GMA Falls Short

1. No ESLI — Documented Change Schedule Required

The 464031 has no end-of-service-life indicator. That means the cartridge cannot tell the wearer when it's saturated. Under OSHA 29 CFR 1910.134 Appendix B, programs using cartridges without ESLI must implement a documented change schedule developed using objective data: concentration, temperature, humidity, work rate, and exposure duration. For small operations or informal PPE programs, this is not a minor administrative task — it requires a defensible documented program. The absence of ESLI is the single most significant operational burden this cartridge imposes relative to competitors that incorporate color-change indicators (though no major OV cartridge for industrial use currently ships with a reliable ESLI — this is a category-wide limitation, not an MSA-specific flaw).

2. Zero Particulate Filtration

The GMA provides no protection against dusts, mists, fumes, aerosols, or particulates of any kind. Industrial spray-painting with airless or HVLP equipment generates paint aerosol. Automotive sanding generates fine metallic and abrasive particulate. Parts cleaning in vapor degreasers can generate mist. Any of these scenarios makes the pure-OV cartridge the wrong choice — the MSA 815178 GMA-P100 is the correct selection wherever vapor and particulate co-exposure exists. Do not assume that a booth's exhaust system eliminates the need for cartridge-level particulate protection without confirming with your CIH.

3. Platform Lock-In: Comfo Only

The GM-series bayonet mount is exclusive to MSA's Comfo platform — Comfo Classic, Comfo II, Ultra-Twin, and Ultra-Elite. It will not fit the MSA Advantage series (snap-on mount) and is not interchangeable with 3M, Moldex, or Honeywell North respirators. Facilities that run a mixed-platform program or have standardized on any non-Comfo respirator must look elsewhere. The comparable Advantage-platform OV cartridge is the MSA 815355 Advantage GMA; the comparable 3M cartridge is the 3M 6001.

4. No Protection for Acid Gases, Ammonia, or Mercury

Chemical plants, wastewater facilities, labs, and semiconductor fabs often expose workers to hydrogen chloride, chlorine, sulfur dioxide, ammonia, methylamine, or mercury vapor alongside organic-vapor-class chemicals. The 464031 provides none of these protections. For any co-exposure scenario involving acid gases, see the MSA 464046 GMC or the MSA 492790 GME; for ammonia specifically, see the MSA 464033 GMD. For mercury vapor, the MSA 815185 Mersorb P100 is the specialized choice.

MSA 464031 GMA vs Competitive OV Cartridges

How the GMA stacks against other organic-vapor cartridges available on the site — including the MSA Comfo-platform upgrade sibling and the dominant 3M competitor option:

Key takeaway: The GMA and 3M 6001 are functional peers in the OV-only category — the decisive factor is which respirator platform you already run. If you're on Comfo, buy the GMA. If you're on 3M, buy the 3M 6001. If combined vapor-plus-particulate protection is needed, the GMA is disqualified — see the MSA 815178 or 3M 60921.

MSA Comfo OV Family: 464031 GMA vs 815178 GMA-P100

The two Comfo-platform organic-vapor cartridges on this site share a mount and platform — they differ only in whether P100 particulate filtration is included:

• Buy the MSA 464031 GMA if: your hazard assessment confirms organic vapors are the sole inhalation hazard, you work in an environment with no concurrent dusts or mists, and per-unit cost control is a priority.
• Buy the MSA 815178 GMA-P100 if: your work generates any combination of organic vapors and particulate — spray painting, grinding with solvents, adhesive application, coatings work with mist or dust co-exposure.

Compatible Respirators for the MSA 464031 GMA

The 464031 uses the GM-series bayonet mount and fits all current MSA Comfo-platform respirators. This includes both half-mask and full-facepiece models:

• MSA Comfo Classic (half-mask) — the foundational Comfo platform respirator; no dedicated page on this site, but the cartridge is a verified fit
• MSA Comfo II (half-mask) — updated silicone facepiece in the Comfo line; verified compatible, no separate product page on this site
• MSA Ultra-Twin (full-facepiece) — dual-cartridge full-face respirator on the Comfo platform; verified compatible, no separate product page on this site
• MSA Ultra-Elite Full Facepiece — MSA's premium full-facepiece respirator; confirmed on-site; accepts the 464031 via bayonet mount

Not compatible: MSA Advantage series respirators (including the MSA Advantage 200 LS and MSA Advantage 420) use a snap-on mount and require Advantage-series cartridges such as the MSA 815355 Advantage GMA. Not compatible with 3M, Moldex, or Honeywell North respirator platforms.

For the full-facepiece APF-50 upgrade path, the MSA Ultra-Elite is the recommended pairing when your risk assessment requires higher protection factors — the 464031 cartridge transfers without change.

Category Context: OV-Only vs Combination Cartridges

The MSA Comfo-platform cartridge family covers five primary protection chemistries plus a pure-particulate option:

• GMA (OV only): this review — for organic-vapor-sole-hazard programs
• GMA-P100 (OV + P100): MSA 815178 — for combined vapor-plus-particulate exposure
• GMB (Acid Gas): MSA 464032 — for acid-gas-only programs (Cl₂, HCl, HF, SO₂)
• GMC (OV + Acid Gas): MSA 464046 — for mixed-chemistry work involving both organic vapors and acid gases
• GMD (Ammonia / Methylamine): MSA 464033 — for refrigeration, fertilizer, and cleaning-chemical applications
• GME (Multi-Gas): MSA 492790 — broadest coverage, suitable for complex mixed-hazard environments

The 464031 GMA is appropriate only when the OV-only column is the complete answer to your hazard assessment. When in doubt, a combination cartridge is generally the defensible choice — overpaying by $5–8 per cartridge is a far smaller liability than under-protecting against an identified hazard.

For the parallel Advantage-platform lineup (snap-on mount), the MSA 815355 Advantage GMA is the OV-only equivalent. See the MSA 815355 Advantage GMA review and MSA 815362 Advantage GMA-P100 review for the Advantage-series comparison.

Total Cost of Ownership: MSA 464031 GMA

Unit cost: $11.55 per cartridge. Cartridges are sold in boxes of 10 at $115.50 per box. For a two-person spray-painting crew running 8-hour shifts with a documented change schedule of one pair per shift, annual cartridge spend per person runs approximately $2,772–$3,000 depending on the change schedule's frequency, which is determined by concentration, temperature, and exposure modeling.

Change-schedule burden: Because the 464031 lacks an ESLI, a documented change schedule is mandatory under OSHA 29 CFR 1910.134 Appendix B. Industrial hygiene consulting fees for developing a defensible program range widely — factor this into the total program cost if starting from scratch. For established programs with existing change-schedule documentation, the ongoing administrative burden is low.

Respirator investment protection: The Comfo-platform respirators that accept this cartridge are mid-range capital items. Standardizing on one cartridge SKU for OV-only applications keeps consumable costs lean without stranding the respirator investment. The upgrade path to MSA 815178 GMA-P100 requires no respirator replacement — just a cartridge SKU change.

Replacement accessories: The MSA 815177 Low Profile P100 filter can be stacked with the GMA on some Comfo-platform configurations for added particulate coverage — confirm with the MSA technical data sheet for your specific respirator model before combining. For multi-gas coverage, the MSA 806059 GMT is the broadest-scope Comfo cartridge.

See the MSA 815178 GMA-P100 review for a full cost-per-shift comparison when particulate protection is required.

Final Verdict

Rating: 4.3 / 5. The MSA 464031 GMA is a straightforward, correctly-priced OV-only cartridge for the Comfo platform. It delivers what it promises — NIOSH-approved organic vapor protection — at the lowest per-unit cost in the MSA Comfo cartridge family. Its weaknesses are structural rather than quality-related: no ESLI demands disciplined documentation, no particulate layer excludes it from the majority of real-world spray-painting applications where aerosols are present, and the bayonet mount means the cartridge is only useful if you already own Comfo-platform equipment.

• Buy the MSA 464031 GMA if: your CIH has documented organic vapors as the sole inhalation hazard, you operate Comfo-platform respirators, and your change schedule program is in place.
• Buy the MSA 815178 GMA-P100 if: your work involves any combination of organic vapors and particulate — spray painting, adhesive bonding, coatings application with mist co-exposure.
• Buy the MSA 464046 GMC if: your exposure profile includes acid gases alongside organic vapors.
• Buy the 3M 6001 if: you run 3M-platform respirators and need OV-only protection at a competitive price point.

Frequently Asked Questions — MSA 464031 GMA Organic Vapor Cartridge

Is the MSA 464031 GMA NIOSH-approved for organic vapors?

Yes. The MSA 464031 GMA is NIOSH-approved under 42 CFR Part 84 for organic vapor protection. You can verify the active approval by searching the NIOSH Certified Equipment List for MSA GMA cartridges. The approval confirms the cartridge meets the minimum performance requirements for organic-vapor class contaminants as defined by the regulation.

What respirators are compatible with the MSA 464031 GMA cartridge?

The 464031 uses the MSA GM-series bayonet (threaded quarter-turn) mount and is compatible exclusively with MSA Comfo-platform respirators: Comfo Classic, Comfo II, Ultra-Twin, and MSA Ultra-Elite Full Facepiece. It will not fit the MSA Advantage series, nor any 3M, Moldex, or Honeywell North respirator. See the compatible respirators section above for the complete list.

Does the MSA 464031 GMA protect against paint aerosol and spray-painting mist?

No. The 464031 is an organic-vapor-only cartridge with no particulate filtration. Spray painting generates atomized paint aerosol — fine droplets that are classified as particulates, not vapors. For spray-painting applications where both solvent vapors and paint aerosol are present, the correct choice is the MSA 815178 GMA-P100, which adds a P100 (≥99.97% efficiency) particulate layer to the same OV protection.

MSA 464031 GMA vs MSA 815178 GMA-P100 — which should I buy?

Buy the 464031 GMA only if your hazard assessment confirms organic vapors are the sole inhalation hazard with no concurrent particulate exposure. Buy the MSA 815178 GMA-P100 for any application involving both organic vapors and particulate — spray painting, adhesive application, coatings work, solvent degreasing in dusty environments. The GMA-P100 costs $8.55 more per cartridge but eliminates the risk of misapplication. Read the full GMA-P100 review for a detailed comparison.

Does the MSA 464031 GMA require a change schedule? How often should cartridges be replaced?

Yes. The 464031 has no end-of-service-life indicator (ESLI), so OSHA 29 CFR 1910.134 Appendix B requires a documented change schedule. The change schedule must be developed using objective data: contaminant concentration (measured or estimated), temperature, relative humidity, work rate, and duration of exposure. There is no universal answer to "how often" — it depends entirely on your specific work environment. A Certified Industrial Hygienist (CIH) can develop or review a change schedule for your program. The OSHA 29 CFR 1910.134 standard and Appendix B are the governing documents.

What is the Assigned Protection Factor (APF) for the MSA 464031 GMA?

APF is determined by the respirator class, not the cartridge. When used with a Comfo half-mask respirator (Comfo Classic, Comfo II), the system carries an APF of 10 — meaning it is expected to reduce workplace concentrations to 1/10th of the ambient level. When used with a full-facepiece respirator (Ultra-Twin, MSA Ultra-Elite), the system carries an APF of 50. See OSHA 29 CFR 1910.134 Table 1 for the full APF matrix.

Can I use the MSA 464031 GMA for acid gas protection?

No. The GMA cartridge provides organic vapor protection only. Acid gases — including hydrogen chloride (HCl), chlorine (Cl₂), hydrogen fluoride (HF), and sulfur dioxide (SO₂) — require a different sorbent chemistry. For OV + acid gas combined protection on the Comfo platform, use the MSA 464046 GMC. For acid gas only, use the MSA 464032 GMB. See the MSA GMC review for a full comparison.

Is the MSA 464031 GMA compatible with the MSA Advantage respirators?

No. The MSA Advantage series uses a snap-on mount that is incompatible with the GM-series bayonet on the 464031. Advantage-platform users need Advantage-series cartridges. The OV equivalent for the Advantage platform is the MSA 815355 Advantage GMA (2-pack). See the MSA 815355 Advantage GMA review for details.

Does the MSA GMA cartridge protect against ammonia?

No. Organic vapor cartridges, including the 464031, do not protect against ammonia or methylamine. These compounds require a different adsorbent material. For ammonia and methylamine protection on the Comfo platform, use the MSA 464033 GMD. For broad multi-gas coverage including ammonia alongside organic vapors and acid gases, see the MSA 492790 GME.

Can the MSA 464031 GMA be used in IDLH or oxygen-deficient atmospheres?

No. Air-purifying respirators — including all MSA Comfo-platform cartridge-based systems — cannot be used in immediately dangerous to life or health (IDLH) concentrations or in oxygen-deficient atmospheres (below 19.5% O₂). These conditions require supplied-air respirators (SARs) or self-contained breathing apparatus (SCBA). The OSHA respiratory protection standard at 29 CFR 1910.134 sets these limits.

How does the MSA 464031 GMA compare to the 3M 6001 for industrial painting?

For pure OV protection, both the MSA 464031 and the 3M 6001 are NIOSH-approved OV-only cartridges. The difference is platform: the 464031 fits Comfo-platform MSA respirators only; the 3M 6001 fits 3M 6000 and 7000 series respirators only. Neither cartridge is appropriate for spray painting where paint aerosol co-exposure is present — for that application, the combined-cartridge options (MSA 815178 or 3M 60921) are the correct selections. See the 3M cartridges collection if you're running a 3M-platform program.

What does "organic vapor" mean — what chemicals does the MSA 464031 protect against?

NIOSH's organic vapor (OV) classification covers a broad class of carbon-based chemical compounds that are volatile at room temperature and are captured by activated-carbon sorbents. Common examples include acetone, methyl ethyl ketone (MEK), toluene, xylene, benzene, isocyanates (prepolymer), naphtha, mineral spirits, hexane, and most solvent-borne paint thinners. The protection scope is defined in NIOSH 42 CFR Part 84. The OV classification does not include acid gases, ammonia, mercury vapor, or inorganic gases.

What is the price of the MSA 464031 GMA and how is it sold?

The MSA 464031 GMA is priced at $115.50 per box of 10 cartridges, or $11.55 per cartridge. Cartridges are sold in box quantities — pairs are used on twin-cartridge respirators (each Comfo respirator accepts two cartridges, one per side), so a box of 10 represents five complete change-outs for a single respirator wearer. See the MSA 464031 product page for current availability and pricing. Check current Amazon pricing for comparison.

MSA GMA vs MSA GMC — when do I need the combination OV/acid-gas cartridge?

Use the GMA (464031) when acid gases are absent from your hazard assessment. Use the MSA 464046 GMC whenever your work environment may contain both organic vapors and acid gases — chemical plant maintenance, laboratory work, pharmaceutical manufacturing, plating operations, or any environment where HCl, Cl₂, HF, or SO₂ is present alongside organic solvents. See the MSA GMC review for a direct comparison.

Can I stack a P100 pre-filter over the MSA 464031 GMA to add particulate protection?

Some Comfo-platform configurations allow a low-profile P100 filter to be combined with the cartridge for added particulate protection. The MSA 815177 Low Profile P100 filter is designed for this purpose on compatible Comfo-platform respirators. However, verify the specific respirator model's compatibility against the MSA technical data sheet before combining, as not all Comfo models accept the low-profile filter stack. If your application regularly requires both OV and P100 protection, the purpose-built MSA 815178 GMA-P100 is a cleaner and more reliably compliant solution.

Where can I read reviews for other MSA Comfo-platform cartridges?

Full editorial reviews for the complete MSA cartridge lineup are available on this site. Related reviews: MSA 815178 GMA-P100 review, MSA 464046 GMC review, MSA 464032 GMB acid gas review, MSA 464033 GMD review, MSA 492790 GME multigas review, and MSA 815185 Mersorb P100 mercury review.