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MSA GMD/P100 Respirator Cartridge — Ammonia And Methylamine/P100 (MSA Comfo)
$227.15
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EDITORIAL REVIEW: 4.4/5WC Safety Review — MSA GMD/P100 Respirator Cartridge Best For: ammonia and methylamine with dust in one cartridge on MSA Comfo respirators. Not For: organic vapor, acid gas or formaldehyde. ...
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EDITORIAL REVIEW: 4.4/5WC Safety Review — MSA GMD/P100 Respirator Cartridge
Best For: ammonia and methylamine with dust in one cartridge on MSA Comfo respirators.
Not For: organic vapor, acid gas or formaldehyde. It covers ammonia and methylamine and particulate only.
Bottom Line: the do-it-all ammonia and methylamine-plus-dust cartridge for the MSA Comfo system. If there is no dust, the gas-only GMD is cheaper.
Editorial assessment by the WC Safety Editorial Team. Scoring reflects published MSA specifications, NIOSH approval, application fit and category expertise. WC Safety did not laboratory-test this product.
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Read our hands-on MSA GMD/P100 review for field-tested buyer notes.
MSA GMD/P100 Respirator Cartridge Overview
The MSA GMD/P100 is a NIOSH-approved combination cartridge for MSA Comfo respirators that protects against ammonia and methylamine AND airborne particulate in one unit. The built-in P100 filter captures at least 99.97% of particles, so the MSA GMD/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 GMD if there is no dust; the MSA GMD/P100 when gas and particulate are both present.
Where the MSA GMD/P100 Fits in Cartridge Selection
The MSA GMD/P100 handles ammonia and methylamine 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 GMD/P100?
Buy it if your work mixes ammonia and methylamine with dust or mist on an MSA Comfo facepiece. Choose the gas-only GMD if there is no dust. For a broader gas mix, see the MSA Comfo GME/P100 multi-gas cartridge.
What Does the MSA GMD/P100 Protect Against?
| Hazard | Fit | Buyer guidance |
|---|---|---|
| Ammonia And Methylamine (ammonia and methylamine) | Yes | Gas side — the sorbent bed. |
| Dust, mist, fume, lead (particulate) | Yes — P100 | Built-in P100 filter, ≥99.97%, oil-proof. |
| Organic Vapor, Acid Gas Or Formaldehyde | No | Use the matching MSA cartridge for that hazard. |
What the MSA GMD/P100 Does NOT Protect Against
The MSA GMD/P100 does not stop organic vapor, acid gas 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 GMD/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
Ammonia refrigeration with dust
Anhydrous-ammonia work with airborne particulate.
Fertilizer & cleaning
Ammonia tasks that also raise dust.
Pros & Cons
Pros
ammonia and methylamine + P100 in one cartridge · ≥99.97% oil-proof particulate · no separate prefilter · genuine MSA Comfo fit
ammonia and methylamine + P100 in one cartridge · ≥99.97% oil-proof particulate · no separate prefilter · genuine MSA Comfo fit
Cons
costs more than the gas-only version · Comfo connection only · one gas class on the gas side
costs more than the gas-only version · Comfo connection only · one gas class on the gas side
MSA GMD/P100 vs Other MSA Cartridges
| Cartridge | Protects against |
|---|---|
| MSA GMD | Ammonia only |
| MSA GME/P100 | Multi-gas + P100 |
| MSA GMA/P100 | OV + P100 |
| MSA GMC/P100 | OV/AG + P100 |
MSA GMD/P100 vs the Alternatives
How it compares to the closest MSA options:
- GMD/P100 vs GMD: same ammonia protection; the GMD/P100 adds a P100 filter for dust.
- GMD/P100 vs GME/P100: the GME/P100 covers ammonia within a broad mix plus P100.
- GMD/P100 (Comfo) vs Advantage: match the cartridge to your facepiece system.
MSA GMD/P100 Quick Answers
Does the MSA GMD/P100 need a separate filter?
No — the P100 filter is built in; there is no prefilter or retainer to add.
Does the MSA GMD/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 GMD/P100 reusable?
The cartridge is used until its gas or filter service life is reached; the respirator is reusable across many changes.
MSA GMD/P100 Specifications
| Gas class | Ammonia And Methylamine |
| Particulate filter | P100 — ≥99.97%, oil-proof (built in) |
| NIOSH markings | Green (ammonia) + magenta (P100) |
| Connection | MSA Comfo |
| Sold as | Each |
Compatible MSA Respirators
The MSA GMD/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.
| Respirator | Type | Compatible? |
|---|---|---|
| MSA Comfo Classic | Half mask | Yes — Comfo bayonet |
| MSA Comfo II | Half mask | Yes — Comfo bayonet |
| MSA Ultra-Elite | Full face | Yes — Comfo bayonet |
| MSA Ultra-Twin | Full face | Yes — Comfo bayonet |
| MSA Advantage series | Half / full | No — different connection |
| 3M / Honeywell North | Half / full | No (not compatible) |
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/P100 Frequently Asked Questions
What does the MSA GMD/P100 protect against?
The MSA GMD/P100 is a ammonia and methylamine / P100 combination cartridge. It captures ammonia and methylamine and filters at least 99.97% of airborne particulate. It does not protect against organic vapor, acid gas or formaldehyde.
Does the MSA GMD/P100 filter dust?
Yes. The MSA GMD/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 GMD/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 GMD/P100?
P100 is the highest NIOSH particulate rating: oil-proof and at least 99.97% efficient. The MSA GMD/P100 carries a magenta P100 marking alongside its gas-class band.
Is the MSA GMD/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 GMD/P100 sold?
This listing is the Each. Use Request a Quote for case pricing.
How often should I replace the MSA GMD/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 GMD/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 GMD/P100 and the gas-only version?
Choose the gas-only GMD if there is no dust; the MSA GMD/P100 when gas and particulate are both present.
What color band is the MSA GMD/P100?
The markings are green (ammonia) + magenta (p100); confirm both your gas class and the P100 on the color chart.
Is this the genuine MSA GMD/P100 cartridge?
Yes. WC Safety sells authentic, NIOSH-approved MSA GMD/P100 cartridges through legitimate supply channels.
How should I store the MSA GMD/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.
Written by Steven Eaton, WC Safety Editorial — industrial respiratory protection desk. Reviewed by the WC Safety Editorial Team. Specifications sourced from MSA Safety published data and verified against the NIOSH Certified Equipment List. Compare the range in MSA respirator filters & cartridges or read MSA Comfo vs Advantage.
WC Safety is an independent PPE retailer and Amazon Associate; no paid placement. Always verify cartridge compatibility and follow your written respiratory protection program. General information, not medical or regulatory advice.
Brand / Vendor
MSA Safety
Model / SKU
815181
Product Type
Respirator Cartridge
Price
$227.15 (Amazon)
Availability
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