MSA GMD Respirator Cartridge — Ammonia And Methylamine (MSA Comfo)

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Read our hands-on MSA GMD review for field-tested buyer notes.

MSA GMD Respirator Cartridge Overview

The MSA GMD is a NIOSH-approved ammonia and methylamine cartridge for the MSA Comfo system. It adsorbs ammonia and methylamine and carries a green (ammonia) 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 GMD belongs to the MSA respirator filters and cartridges range. It is a gas cartridge only — for dust, step up to the GMD/P100 combination cartridge, which builds a P100 filter in.

Where the MSA GMD Fits in Cartridge Selection

Confirm the hazard before the cartridge. The MSA GMD handles ammonia and methylamine 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 GMD?

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

What Does the MSA GMD Protect Against?

What the MSA GMD Does NOT Protect Against

The MSA GMD does not capture particulate or organic vapor, acid gas or particulate. For dust, step up to the GMD/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 GMD 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

Refrigeration & fertilizer

Anhydrous-ammonia plants and fertilizer handling are its core use.

Treatment & cleaning

Ammonia tasks; for dust too, step up to the GMD/P100.

Pros & Cons

MSA GMD vs Other MSA Cartridges

MSA GMD vs the Alternatives

How it compares to the closest MSA options:

• GMD vs GMD/P100: same ammonia protection; the GMD/P100 adds a P100 filter for dust.
• GMD vs GME: the GME multi-gas also covers ammonia within a broader mix.
• GMD (Comfo) vs Advantage GMD: same chemistry, different facepiece system.

MSA GMD Quick Answers

Does the MSA GMD filter dust?

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

Does the MSA GMD 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 GMD reusable?

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

MSA GMD Specifications

Compatible MSA Respirators

The MSA GMD 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 GMD Frequently Asked Questions

What does the MSA GMD protect against?

The MSA GMD is a ammonia and methylamine cartridge. It adsorbs ammonia and methylamine. It is gas-only and does not filter particulate; it does not protect against organic vapor, acid gas or particulate.

Does the MSA GMD filter dust?

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

Which respirators does the MSA GMD 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 GMD?

The MSA GMD carries a green (ammonia) band; confirm it on the cartridge color chart before use.

Is the MSA GMD NIOSH-approved?

Yes. The MSA GMD is NIOSH-approved under 42 CFR Part 84 for ammonia and methylamine. Verify any cartridge against the NIOSH Certified Equipment List.

How is the MSA GMD sold?

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

How often should I replace the MSA GMD?

Replace the cartridge on a documented change-out schedule, when you detect gas or odor breakthrough, or when it is damaged.

Can I add a P100 filter to the MSA GMD?

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

Is the MSA GMD 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 GMD cartridge?

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

What is the difference between the MSA GMD 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 GMD?

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