MSA GMC Respirator Cartridge — Organic Vapor And Acid Gas (MSA Comfo)

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Read our MSA GMC review for the detailed review.

MSA GMC Respirator Cartridge Overview

The MSA GMC is a NIOSH-approved organic vapor and acid gas cartridge for the MSA Comfo system. It adsorbs solvent vapors plus chlorine, hydrogen chloride and sulfur dioxide and carries a yellow (ov/acid gas) band. As a Comfo cartridge it fits MSA Comfo Classic, Comfo II, Ultra-Twin and Ultra-Elite respirators. Start with our guide to choosing a respirator cartridge, confirm the band on the respirator cartridge color chart, and see MSA Comfo vs Advantage if you are unsure which system you own.

The MSA GMC belongs to the MSA respirator filters and cartridges range. It is a gas cartridge only — for dust, step up to the GMC/P100 combination cartridge, which builds a P100 filter in.

Where the MSA GMC Fits in Cartridge Selection

Confirm the hazard before the cartridge. The MSA GMC handles organic vapor and acid gas gas — not particulate. If you also face dust or mist, our organic vapor vs P100 guide and filter types explained cover when to move to a combination cartridge.

Who Should Buy the MSA GMC?

Buy it if your exposure is organic vapor and acid gas with no significant dust, on an MSA Comfo facepiece. Choose another cartridge if your hazard differs: for organic vapor and acid gas plus dust use the GMC/P100, and for a broader gas mix see the MSA Comfo GME multi-gas cartridge.

What Does the MSA GMC Protect Against?

What the MSA GMC Does NOT Protect Against

The MSA GMC does not capture particulate or ammonia or particulate. For dust, step up to the GMC/P100 combination cartridge, which builds a P100 filter in; for a different gas, match the MSA cartridge to the hazard.

No air-purifying cartridge makes a dangerous atmosphere safe. Never use the MSA GMC in an oxygen-deficient or IDLH (immediately dangerous to life or health) atmosphere, in unknown concentrations, or against gases with no warning properties — those conditions require a supplied-air or SCBA system, not a cartridge respirator. A cartridge or filter carries no assigned protection factor of its own — the APF comes from the facepiece it is fitted to: 10 for a half mask, 50 for a full facepiece (OSHA 1910.134 Table 1), which is the number that decides the highest exposure the respirator may legally be worn in. That facepiece must be fit tested before first use and at least annually, and a fit test is specific to one make, model, and size — passing on one mask does not carry over to another. Perform a user seal check every time the respirator is donned, and note that facial hair crossing the sealing surface disqualifies a tight-fitting respirator no matter how well it fit at the last test.

Best Applications

Chemical handling

Tasks mixing solvents and acid gases; see GMC/P100 vs 3M 60923.

Lab & treatment

Where both vapor classes appear; add a prefilter for dust or use the GMC/P100.

Pros & Cons

MSA GMC vs Other MSA Cartridges

MSA GMC vs the Alternatives

How it compares to the closest MSA options:

• GMC vs GMC/P100: same dual-gas protection; the GMC/P100 adds a P100 filter.
• GMC vs GME: the GME multi-gas adds ammonia and formaldehyde to the mix.
• GMC (Comfo) vs Advantage GMC: same chemistry, different facepiece system.

MSA GMC Quick Answers

Does the MSA GMC filter dust?

No — it is gas-only; for particulate use the GMC/P100 or add a prefilter.

Does the MSA GMC fit my MSA respirator?

It fits the MSA Comfo family. Check your facepiece against the MSA half-mask and full-face ranges.

Is the MSA GMC reusable?

The cartridge is used until its service life is reached; the respirator is reusable across many cartridge changes.

MSA GMC Specifications

Compatible MSA Respirators

The MSA GMC uses the MSA Comfo threaded-bayonet connection, so it mounts on the Comfo Classic half-mask and Ultra-Elite full-face respirators (and the Comfo II and Ultra-Twin). It is not interchangeable with the MSA Advantage series, and does not fit 3M, Honeywell North or other brands.

Helpful Buying Guides

• MSA Comfo vs Advantage
• How to choose a respirator cartridge
• MSA vs 3M respirator cartridges
• MSA vs Honeywell North cartridges
• organic vapor vs P100
• respirator cartridge color chart
• respirator filter types explained

MSA GMC Frequently Asked Questions

What does the MSA GMC protect against?

The MSA GMC is a organic vapor and acid gas cartridge. It adsorbs solvent vapors plus chlorine, hydrogen chloride and sulfur dioxide. It is gas-only and does not filter particulate; it does not protect against ammonia or particulate.

Does the MSA GMC filter dust?

No. It is a gas cartridge. For dust or mist, step up to the GMC/P100 combination cartridge, which builds a P100 filter in.

Which respirators does the MSA GMC fit?

It uses the MSA Comfo threaded-bayonet connection and fits the Comfo Classic, Comfo II, Ultra-Twin and Ultra-Elite. It does not fit the Advantage series.

What color band is the MSA GMC?

The MSA GMC carries a yellow (ov/acid gas) band; confirm it on the cartridge color chart before use.

Is the MSA GMC NIOSH-approved?

Yes. The MSA GMC is NIOSH-approved under 42 CFR Part 84 for organic vapor and acid gas. Verify any cartridge against the NIOSH Certified Equipment List.

How is the MSA GMC sold?

This listing is the Each. Case pricing comes from an industrial distributor; we do not quote.

How often should I replace the MSA GMC?

Replace the cartridge on a documented change-out schedule based on objective data, or when an end-of-service-life indicator shows it is spent, and whenever it is damaged. Under 29 CFR 1910.134(d)(3)(iii)(B) the change schedule must rest on objective data or an end-of-service-life indicator — odour, taste or irritation may not be the primary basis. If you can smell or taste anything through the cartridge, breakthrough has already happened: leave the area immediately and change it..

Can I add a P100 filter to the MSA GMC?

Yes — the easiest route is the GMC/P100, which builds a P100 particulate filter into the same gas cartridge.

Is the MSA GMC the same as the Advantage version?

No. The chemistry is equivalent, but the connection differs — Comfo and Advantage cartridges are not interchangeable. Match the cartridge to your facepiece.

Is this the genuine MSA GMC cartridge?

Yes. Buy authentic, NIOSH-approved MSA GMC cartridges through legitimate channels only.

What is the difference between the MSA GMC and a multi-gas cartridge?

A single-class cartridge is tuned to its listed gases; a multi-gas cartridge covers a broader mix at the cost of a shorter service life against any one gas.

How should I store the MSA GMC?

Store it sealed in its original packaging, away from gases and dust, so the sorbent is not used up before you wear it.