MSA GMA/P100 Respirator Cartridge — Organic Vapor/P100 (MSA Comfo)

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Read our hands-on MSA GMA/P100 review for field-tested buyer notes.

MSA GMA/P100 Respirator Cartridge Overview

The MSA GMA/P100 is a NIOSH-approved combination cartridge for MSA Comfo respirators that protects against organic vapor AND airborne particulate in one unit. The built-in P100 filter captures at least 99.97% of particles, so the MSA GMA/P100 covers gas plus dust without a separate prefilter. Start with the cartridge selection guide, the organic vapor vs P100 guide and the color chart.

As a Comfo combination cartridge it fits the MSA Comfo Classic, Comfo II, Ultra-Twin and Ultra-Elite, and belongs to the MSA respirator filters and cartridges range. Choose the gas-only GMA if there is no dust; the MSA GMA/P100 when gas and particulate are both present.

Where the MSA GMA/P100 Fits in Cartridge Selection

The MSA GMA/P100 handles organic vapor and airborne particulate. If you are weighing gas-only versus combination cartridges, our filter types explained and Comfo vs Advantage guides help you decide.

Who Should Buy the MSA GMA/P100?

Buy it if your work mixes organic vapor with dust or mist on an MSA Comfo facepiece. Choose the gas-only GMA if there is no dust. For a broader gas mix, see the MSA Comfo GME/P100 multi-gas cartridge.

What Does the MSA GMA/P100 Protect Against?

What the MSA GMA/P100 Does NOT Protect Against

The MSA GMA/P100 does not stop acid gas, ammonia or formaldehyde. For a different gas, match the MSA cartridge to the hazard; for a broad mix use the GME/P100 multi-gas version.

No air-purifying cartridge makes a dangerous atmosphere safe. Never use the MSA GMA/P100 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.

Best Applications

Painting with overspray

Spray finishing that throws solvent vapor and aerosol; see GMA/P100 vs 3M 60921.

Solvent work in dusty shops

Degreasing where dust is also airborne.

Pros & Cons

MSA GMA/P100 vs Other MSA Cartridges

MSA GMA/P100 vs the Alternatives

How it compares to the closest MSA options:

• GMA/P100 vs GMA: same organic vapor; the GMA/P100 adds a P100 filter for dust.
• GMA/P100 vs GMC/P100: the GMC/P100 also covers acid gas.
• GMA/P100 (Comfo) vs Advantage GMA/P100: same chemistry, different facepiece system. vs 3M 60921 →

MSA GMA/P100 Quick Answers

Does the MSA GMA/P100 need a separate filter?

No — the P100 filter is built in; there is no prefilter or retainer to add.

Does the MSA GMA/P100 fit my MSA respirator?

It fits the MSA Comfo family; check your facepiece in the MSA half-mask and full-face ranges.

Is the MSA GMA/P100 reusable?

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

MSA GMA/P100 Specifications

Compatible MSA Respirators

The MSA GMA/P100 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 GMA/P100 Frequently Asked Questions

What does the MSA GMA/P100 protect against?

The MSA GMA/P100 is a organic vapor / P100 combination cartridge. It captures solvents, paints and degreasers and filters at least 99.97% of airborne particulate. It does not protect against acid gas, ammonia or formaldehyde.

Does the MSA GMA/P100 filter dust?

Yes. The MSA GMA/P100 has a built-in P100 filter that captures at least 99.97% of airborne particles, including oil-based mists, so no separate prefilter is needed.

Which respirators does the MSA GMA/P100 fit?

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

What does P100 mean on the MSA GMA/P100?

P100 is the highest NIOSH particulate rating: oil-proof and at least 99.97% efficient. The MSA GMA/P100 carries a magenta P100 marking alongside its gas-class band.

Is the MSA GMA/P100 NIOSH-approved?

Yes, under 42 CFR Part 84 for its listed gases and P100 particulate. Verify against the NIOSH Certified Equipment List.

How is the MSA GMA/P100 sold?

This listing is the Each. Use Request a Quote for case pricing.

How often should I replace the MSA GMA/P100?

Replace the gas portion on a change-out schedule or at odor breakthrough, and replace when breathing through the P100 filter becomes noticeably harder.

Does the MSA GMA/P100 need a separate filter?

No. The P100 particulate filter is built in, so there is no prefilter or retainer to add.

What is the difference between the MSA GMA/P100 and the gas-only version?

Choose the gas-only GMA if there is no dust; the MSA GMA/P100 when gas and particulate are both present.

What color band is the MSA GMA/P100?

The markings are black (ov) + magenta (p100); confirm both your gas class and the P100 on the color chart.

Is this the genuine MSA GMA/P100 cartridge?

Yes. WC Safety sells authentic, NIOSH-approved MSA GMA/P100 cartridges through legitimate supply channels.

How should I store the MSA GMA/P100?

Store it sealed in its original packaging, away from gases and dust, so neither the gas nor filter service life is used up before use.