MSA GMC P100 Cartridge Review: Three Hazards, One Cartridge
MSA GMC P100 Cartridge Review: Three Hazards, One Cartridge — the short answer
Short answer: The MSA GMC-P100 is the broadest of the standard Comfo combinations — organic vapor, acid gas and P100 particulate in one housing. The reviewed listing is live here; it still excludes ammonia and methylamine, which is the GMD side of the range, and no cartridge anywhere removes carbon monoxide. Everything in this family is used under OSHA 1910.134, which means a written program, a medical evaluation before use, an annual model-specific fit test, and no air-purifying respirator in an IDLH or oxygen-deficient atmosphere.
Pros and cons
Pros
- Covers three hazard classes in one cartridge — organic vapor, acid gas and P100 particulate — which is the combination most plating, degreasing and chemical transfer work actually presents.
- Removes the swap decision at the facepiece: one cartridge handles the mixed atmosphere rather than a worker choosing between two single-hazard options mid-task.
- Priced well below the other Comfo combinations, which makes standardizing on it straightforward where the hazard profile fits.
- Threads onto the MSA Comfo range with no adapter.
Cons
- Does not cover ammonia or methylamine — that is the GMD side of the range, and the gap is easy to miss because the GMC-P100 otherwise looks like the broad option.
- Nothing for carbon monoxide. No air-purifying cartridge removes CO, whatever its designation.
- Three sorbent functions in one housing means service life is governed by whichever contaminant loads first, so the change schedule has to account for all of them.
- Comfo platform only — it will not fit MSA Advantage facepieces, which use a snap-on mount rather than a threaded one.
Is the MSA 815180 GMC-P100 the right triple-combination cartridge for mixed chemical and particulate environments?
Published · Last updated
Short answer: Yes — for Comfo-platform users who need NIOSH-approved protection against organic vapors, acid gases, and airborne particulates in a single cartridge. The MSA 815180 GMC-P100 is the triple-combination workhorse of the MSA GM-series lineup, and at its listed price per cartridge it delivers more protection per dollar than the vapor-only MSA 464046 GMC. For environments where particulate co-exposure is absent and you want the narrowest possible specification match, the MSA 464046 GMC is the purpose-built alternative — but most industrial environments with OV and acid gas exposure also produce aerosols or mists, making the GMC-P100 the correct default.
The MSA 815180 GMC-P100 is the Comfo platform's triple-combination cartridge — the answer when your hazard assessment documents organic vapors, acid gases, and airborne particulates in the same work environment. In the MSA respirator filters and cartridges collection, it occupies a unique position: the only GM-series bayonet cartridge that layers P100 particulate filtration (≥99.97% efficiency) over an activated carbon bed for both OV and acid gas adsorption, delivering three-class coverage without requiring a separate pre-filter or add-on adapter.
This review covers the 815180 GMC-P100's three-layer construction, its cost-per-cartridge advantage over the sibling MSA 464046 GMC, how it stacks up against the 3M 60923 and 3M 60926, and the specific work scenarios — chemical manufacturing, automotive refinishing in acid environments, semiconductor operations — where it is the specification-correct choice.
Editorial Verdict: 4.6 / 5
The MSA 815180 GMC-P100 is the best-value triple-combination cartridge on the Comfo platform — NIOSH-approved for organic vapors, acid gases, and P100 particulate filtration in a single GM-series bayonet cartridge. At a listed price of its listed price per cartridge (its listed price/box of 6), it costs less per unit than the vapor-only MSA 464046 GMC while delivering broader protection — a rare case where the more capable option is also the cheaper one. The primary limitation is platform lock-in: the GM-series bayonet is Comfo/Ultra-Elite only. Verify pricing before purchasing as prices are subject to change.
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Strengths
- Triple-combination NIOSH approval: OV + Acid Gas + P100 in one cartridge
- P100 layer filters ≥99.97% of airborne particulates including metal fumes and oil aerosols
- Lower per-cartridge cost than the vapor-only MSA 464046 GMC (the listed price as listed)
- Three-layer construction: P100 filter + activated carbon bed + impregnated sorbent
- GM-series threaded mount: positive-lock engagement on Comfo and Ultra-Elite facepieces
- Eliminates need for a separate particulate pre-filter in mixed-hazard environments
Weaknesses
- No ESLI — documented change schedule required per OSHA 1910.134(d)(3)(iii)
- GM-series bayonet only — incompatible with Advantage snap-on series and all 3M/Moldex facepieces
- Does not protect against ammonia, methylamine, mercury vapor, formaldehyde, or CO
- P100 layer adds breathing resistance vs vapor-only cartridge — relevant for high-exertion tasks
- Sold in boxes of 6 (vs 10 for the 464046 GMC) — smaller per-box quantity for high-volume programs
Who should use the MSA 815180 GMC-P100?
- Chemical manufacturing workers with confirmed co-exposure to OV solvents, acid gases (Cl₂, HCl, SO₂, HF), and airborne particulates (dust, fume, mist) in the same operation — the single-cartridge solution to a three-class hazard profile.
- Automotive refinishing technicians in acid environments — solvent-based coatings plus acid-wash prep or etching primer operations that generate both vapor and aerosol exposure simultaneously.
- Semiconductor and electronics manufacturing — processes using organic solvents and acid gases alongside particulate-generating steps (CMP slurry, dicing, etching residues).
- Battery processing and recycling operations — sulfuric acid aerosol, SO₂ off-gassing, and solvent exposure combined; the P100 layer handles the sulfuric acid mist that the vapor-only GMC does not.
- Comfo-platform fleet managers seeking a default dual-class cartridge — when the facility has mixed operations and one cartridge must serve multiple hazard zones, the GMC-P100 is the safer over-specification than the vapor-only GMC.
See the full MSA respirator filters and cartridges collection for the complete GM-series lineup.
What the MSA 815180 GMC-P100 does well
Three-layer construction delivers genuine triple-class protection
The 815180 GMC-P100's internal architecture stacks three distinct filtration mechanisms in sequence: the outermost P100 electrostatic filter captures ≥99.97% of airborne particulates (including oil-based aerosols, metal fumes, and fine dusts); the activated carbon bed adsorbs organic vapor solvents; and the impregnated sorbent layer neutralizes acid gas molecules (Cl₂, HCl, SO₂, HF). This layered design means the cartridge does not compromise on any single class — each layer is purpose-formulated for its specific chemistry, not a blended compromise.
Cost advantage over the vapor-only sibling
The 815180 GMC-P100 is listed at its listed price per cartridge (its listed price/box of 6), versus its listed price per cartridge for the MSA 464046 GMC. The per-shift cost delta is approximately its listed price per shift (two-cartridge use) in favor of the GMC-P100 — a meaningful number in high-frequency replacement programs. For a safety program running 250 shifts per year with two workers, that is over its listed price,600 in annual savings while adding particulate protection. Current pricing should be verified before purchasing.
Eliminates separate pre-filter logistics
In facilities without the GMC-P100, providing OV/AG coverage plus particulate protection requires either a combination cartridge with a separate pre-filter or two different cartridge SKUs for different hazard zones. The 815180 GMC-P100 consolidates this into a single cartridge SKU — simplifying procurement, inventory, and the written respiratory protection program. There is no separate MSA Low Profile P100 Particulate Filter needed when the GMC-P100 is deployed.
P100 coverage for oil and water aerosols
The P100 NIOSH approval is the highest particulate efficiency class — ≥99.97% filtration, rated for both oil-based and non-oil aerosols. This matters in environments like automotive refinishing (lacquer and waterborne paint aerosol), semiconductor wet processes (acid mist with organic solvent vapor), and chemical manufacturing (process aerosol containing both OV and acid gas components). N95 and R95 pre-filters would not provide adequate protection in these environments; the P100 layer in the GMC-P100 does.
NIOSH 42 CFR Part 84 approval across all three classes
The 815180 GMC-P100 carries NIOSH approval under 42 CFR Part 84 for organic vapor, acid gas, and P100 particulate simultaneously — a single approval covering all three hazard classes. Verify current approval status on the NIOSH Certified Equipment List.
Where the MSA 815180 GMC-P100 falls short
No ESLI — change schedule is mandatory documentation
Like all MSA GM-series cartridges, the 815180 GMC-P100 lacks an End-of-Service-Life Indicator. Under OSHA 29 CFR 1910.134(d)(3)(iii), a written change schedule based on breakthrough time data, concentration levels, temperature, humidity, and work duration is required. The P100 layer offers a practical cue — when the particulate filter becomes noticeably harder to breathe through, it signals particulate loading — but this is not a substitute for a documented vapor breakthrough schedule, as vapor breakthrough occurs independently of filter loading.
Platform-locked to GM-series bayonet facepieces
The GMC-P100 is incompatible with the Advantage series snap-on respirators (Advantage 200, 290, 420, 1000, 3000) and with all 3M and Moldex facepieces. Organizations running a mixed fleet of Comfo and Advantage respirators cannot standardize on this single SKU. For Advantage snap-on facepieces, the equivalent triple-combination cartridge is the MSA Advantage GMC-P100.
No ammonia, mercury, formaldehyde, or CO coverage
The triple-combination coverage stops at OV, acid gas, and P100 particulates. The 815180 GMC-P100 provides no protection against ammonia (NH₃), methylamine, mercury vapor, formaldehyde at high concentrations, or carbon monoxide. For ammonia co-exposure on the Comfo platform, the MSA GMD is the correct cartridge. For multi-gas coverage extending to ammonia and additional inorganic gases, the MSA GME-P100 covers a broader chemical profile.
MSA 815180 GMC-P100 vs the competitive OV/AG/P100 cartridge field
How the 815180 GMC-P100 compares to triple-combination competitors across the range we cover:
| Spec | MSA 815180 GMC-P100 | 3M 60923 AG/OV/P100 | 3M 60926 Multi/P100 | MSA Adv. GMC-P100 |
|---|---|---|---|---|
| Organic Vapor | ✓ | ✓ | ✓ | ✓ |
| Acid Gas (Cl₂, HCl, SO₂, HF) | ✓ | ✓ | ✓ | ✓ |
| P100 Particulate (≥99.97%) | ✓ | ✓ | ✓ | ✓ |
| Ammonia/Methylamine | — | — | ✓ | — |
| Mount Type | GM bayonet | 3M bayonet | 3M bayonet | MSA snap-on |
| Compatible Facepieces | Comfo, Ultra-Elite | 3M 6000/7000/FF | 3M 6000/7000/FF | Advantage 200–3000 |
| Price per cartridge | $7.75 | Market | Market | Market |
3M 60923 on Amazon 3M 60926 on Amazon
Note on the 3M 60926: if your hazard profile includes ammonia or methylamine in addition to OV/AG/particulates and you are running a 3M facepiece fleet, the 3M 60926 extends coverage to those gases. See the 3M 60926 review. If your facepiece platform is Comfo/Ultra-Elite and ammonia co-exposure is documented, the MSA GME-P100 covers the broader chemical profile on the MSA platform.
MSA 815180 GMC-P100 — Frequently Asked Questions
Is the MSA 815180 GMC-P100 NIOSH-approved for organic vapor, acid gas, and P100 particulates?
Yes. The MSA 815180 GMC-P100 carries NIOSH approval under 42 CFR Part 84 for all three classes simultaneously: organic vapor, acid gas (Cl₂, HCl, SO₂, HF), and P100 particulate filtration (≥99.97% efficiency including oil-based aerosols). Verify the current approval status on the NIOSH Certified Equipment List.
MSA 815180 GMC-P100 vs MSA 464046 GMC — which should I buy?
The GMC-P100 is the better choice in most industrial environments. It adds P100 particulate filtration and costs less per cartridge as listed. Buy the MSA 464046 GMC only if your documented risk assessment explicitly confirms zero particulate co-hazard — a relatively uncommon scenario in environments where OV and acid gas exposure is present. See the MSA 464046 GMC review for details on that cartridge.
MSA 815180 GMC-P100 vs 3M 60923 — which triple-combination cartridge wins?
Both cartridges deliver OV + acid gas + P100 protection with equivalent NIOSH approval standards. The critical differentiator is platform: the 815180 GMC-P100 uses the MSA GM-series bayonet for Comfo and Ultra-Elite facepieces; the 3M 60923 uses the 3M bayonet for 6000, 7000, and FF series facepieces. Select based on which facepiece platform your fleet runs — these cartridges are not interchangeable across brands. Check 3M 60923 price on Amazon.
What respirators are compatible with the MSA 815180 GMC-P100?
The 815180 GMC-P100 is compatible with GM-series bayonet facepieces: MSA Comfo Classic (Hycar and Silicone), MSA Comfo II, MSA Ultra-Twin, and the MSA Ultra-Elite. It is NOT compatible with Advantage series snap-on respirators or any 3M/Moldex facepiece. Confirm compatibility against the MSA technical documentation before deployment.
Does the MSA 815180 GMC-P100 protect against ammonia?
No. The GMC-P100's coverage is OV + acid gas + P100 particulate. It provides zero protection against ammonia (NH₃) or methylamine (CH₃NH₂). If ammonia is a documented hazard, the correct Comfo-platform cartridge is the MSA GMD (vapor only) or the MSA GMD-P100 (with particulate filtration). See the MSA GMD review.
How often should I replace the MSA 815180 GMC-P100 cartridge?
No ESLI is present. OSHA 29 CFR 1910.134(d)(3)(iii) requires a written change schedule based on breakthrough time calculations for the specific vapor and acid gas contaminants, concentration levels, temperature, humidity, and work duration. Replace on the vapor/acid gas breakthrough schedule — do not rely solely on P100 filter loading as a replacement cue, as vapor breakthrough occurs independently of particulate accumulation. Consult a Certified Industrial Hygienist (CIH) for program documentation.
What does P100 mean on the MSA 815180 GMC-P100?
P100 is the NIOSH highest-efficiency particulate class under 42 CFR Part 84: ≥99.97% filtration efficiency, rated for oil-based and non-oil aerosols. The "P" designates oil-proof (versus "N" for not oil-resistant or "R" for oil-resistant). P100 cartridges are appropriate for oil aerosols, metal fumes and other fine particulates where N95 or R95 efficiency would be insufficient. Isocyanates are the exception worth calling out: they are present as vapor as well as aerosol, so a P100 layer does not address the vapor fraction and spray application is normally controlled with supplied air.
Can the MSA 815180 GMC-P100 replace a separate vapor cartridge plus pre-filter combination?
Yes — in most cases. The 815180 GMC-P100 integrates P100 particulate filtration directly into the cartridge body, eliminating the need for a separate pre-filter adapter on compatible Comfo and Ultra-Elite facepieces. This simplifies cartridge logistics, reduces part numbers in the inventory, and eliminates the fit variability introduced by separate pre-filter attachments.
What is the APF for the MSA 815180 GMC-P100?
The APF is determined by the facepiece, not the cartridge. On a half-mask respirator (Comfo Classic, Comfo II), the APF is 10 — protection up to 10× the applicable PEL. On a full-face facepiece (Ultra-Twin, Ultra-Elite), the APF is 50 — protection up to 50× the PEL. Neither configuration is appropriate for IDLH atmospheres.
Is the MSA 815180 GMC-P100 appropriate for automotive refinishing?
For solvent-based refinishing, yes — but two-component isocyanate clearcoat spraying is normally a supplied-air job rather than a cartridge one, so confirm which you are doing where acid-wash primer, etching products, or surface pretreatments generate both OV vapor and acid gas co-exposure alongside spray aerosol. The P100 layer covers the spray aerosol; the OV and acid gas layers cover the vapor hazards. Confirm that your specific chemical profile is within the NIOSH-approved coverage classes before deployment, and document the change schedule per OSHA 1910.134.
MSA 815180 GMC-P100 vs MSA GME-P100 — which has broader coverage?
The MSA GME-P100 offers broader gas coverage — extending to a wider range of inorganic gases beyond the four acid gases covered by the GMC-P100. If your hazard assessment identifies gas classes beyond OV and standard acid gases, the GME-P100 may be the more appropriate selection. The GMC-P100 is the specification-correct choice when the documented hazard is specifically OV + acid gas (Cl₂, HCl, SO₂, HF) + particulate. See the MSA GME review for the multi-gas alternative.
Do I need one or two MSA 815180 GMC-P100 cartridges per use?
The 815180 GMC-P100 installs on both sides of a two-cartridge facepiece. Each use cycle consumes two cartridges (one per side). The box of 6 individual cartridges yields 3 complete cartridge pairs per box. Plan inventory in multiples of 2 boxes for whole-shift coverage without leftover odd cartridges.
A combination cartridge carries two approvals — and two change triggers
This is the point most often missed on combination media. A gas-plus-P100 cartridge is approved twice over: once for the gas or vapor its sorbent is rated against, and once as a P100 particulate filter at 99.97 percent. Neither half covers the other. The sorbent does nothing for dust, fume or mist, and the P100 layer does nothing for gases or vapors — it simply sits in the same housing.
Because the two halves fail differently, they need different replacement rules and the earlier of the two governs. The sorbent is replaced on an end-of-service-life indicator where one exists, or otherwise on a change schedule built from objective data, as OSHA 1910.134(d)(3)(iii) requires — never on smell or taste. The particulate filter loads rather than breaks through, so its practical trigger is increased breathing resistance, along with damage, soiling or contamination. A cartridge whose filter side is still breathing freely can be well past its sorbent life, and a cartridge that has become hard to breathe through must come off regardless of how much sorbent capacity remains. The combination does not extend the life of either half.
One consequence for cost: combination cartridges are replaced on the shorter of the two clocks, so per-cartridge price is a poor guide to running cost. Confirm the approval covering your exact part on the NIOSH Certified Equipment List — the approved-substance list and any escape-only qualifiers are properties of the approval, not of the marketing description.
What a “multi-gas” cartridge does and does not cover
MSA’s letter codes name a specific approved list, not a general capability. The GMA is organic vapor; GMB acid gas; GMC organic vapor plus acid gas; GMD ammonia and methylamine; and the multi-gas GME and GMT cover a broader but still enumerated set. “Multi-gas” never means “any gas”. Each approval names the substances, and several carry qualifiers that matter more than the headline — MSA lists hydrogen sulfide on the GME for escape only, which is a different duty entirely from working in it.
Two limits apply no matter which letter is on the cartridge. No air-purifying cartridge removes carbon monoxide. CO is not adsorbed by the sorbents used in these cartridges, so a CO hazard is answered by ventilation, monitoring, and supplied air — never by a cartridge, whatever its multi-gas designation. And a gas or vapor cartridge does nothing for particulate: dust, fume, mist and lead need a particulate filter, which is why the combination parts exist. Read the approved-substance list for the exact part number against your air monitoring, and where the contaminant or its concentration is unknown, the answer is not a broader cartridge — it is measurement, or supplied air.
These cartridges only fit MSA facepieces
Cartridge connections are proprietary. MSA Advantage and Comfo cartridges thread onto MSA facepieces and nothing else — they do not fit 3M bayonet respirators, Honeywell North, or Moldex, and no adapter makes that combination approved. This matters beyond convenience, because a NIOSH approval covers a complete assembly: a specific facepiece with specific media. Mixing a cartridge from one manufacturer onto another’s facepiece voids the approval even if the parts physically engage, which means the respirator is no longer NIOSH-approved equipment for the purposes of OSHA 1910.134.
The practical rule when restocking: match the cartridge to the facepiece brand first, then to the hazard. Confirm the approval covering your exact combination on the NIOSH Certified Equipment List rather than from a listing, and check the letter designation printed on the cartridge against what your hazard assessment calls for. Where a program runs more than one brand of facepiece, the stores that go with each need to be physically separated — the most common way the wrong cartridge reaches a face is a shared bin.
When to change a cartridge — and why “when I smell it” is not the answer
OSHA 1910.134(d)(3)(iii) is explicit: where gas or vapor cartridges are used, the employer must either fit them with an End of Service Life Indicator approved for the contaminant, or implement a change schedule based on objective information or data that ensures cartridges are replaced before the end of their service life. Relying on odor, taste, or irritation as the primary signal is not one of the permitted options, and the reason is straightforward: many contaminants have poor warning properties, individual sensitivity varies widely, and by the time a vapor is detectable inside the facepiece the breakthrough has already happened.
Mercury is the sharpest illustration. Mercury vapor has no odor at all, which is exactly why NIOSH-approved mercury cartridges carry a colorimetric ESLI — the indicator changes color as the sorbent loads, giving the wearer a visible end-of-service signal that a nose cannot provide. Particulate filters follow a different rule: they load rather than break through, so the practical trigger is increased breathing resistance, along with damage, soiling, or contamination of the filter. Replace a particulate filter when it becomes harder to breathe through, and never wash or attempt to clean filter media.
What has to be in place before anyone wears this
A respirator is the one piece of PPE that comes with a program attached. Where respirators are required, OSHA 1910.134 obliges the employer to run a written respiratory protection program with a named administrator, and four elements govern whether the equipment on this page will actually protect the person wearing it.
Medical evaluation comes first. Under 1910.134(e), a worker must be medically evaluated — using the Appendix C questionnaire or an equivalent examination — before fit testing or use, because breathing through a respirator imposes real physiological load. Fit testing is annual and model-specific under 1910.134(f): a passing test on one make, model and size does not transfer to another, so changing facepiece or size means testing again. Facial hair that crosses the sealing surface prohibits use — this is not a grooming preference but a seal failure, and no amount of strap tension compensates. And a user seal check goes on every single donning, per Appendix B-1, which takes seconds and is the only check that happens at the moment of use. Cartridge and filter selection follows from air monitoring and a hazard assessment; where the contaminant or its concentration is unknown, the answer is not a better cartridge.
The rest of the MSA Comfo cartridge range
Each combination cartridge has a gas-only sibling, and the choice between them is simply whether particulate is present. For acid gas there is the GMB and its GMB-P100; for organic vapor plus acid gas the GMC and GMC-P100; for ammonia and methylamine the GMD and GMD-P100; and for the multigas list the GME and GME-P100. Two specialist combinations have no gas-only twin: the GMI for radioiodine and the MerSorb-P100 for mercury vapor. Where particulate is the only hazard, the 815177 low-profile P100 covers it alone. Facepieces sit under MSA half mask respirators and MSA full face respirators, media under MSA respirator filters and cartridges.
Why trust WC Safety
WC Safety is an independent, affiliate-supported review site. We hold no inventory, sell nothing directly, and earn only from qualifying purchases made through clearly marked links — which never changes what a cartridge is approved to do. Reviews are compiled by Steven Eaton from MSA’s published technical data, the NIOSH approval record, the live listing, and the standards themselves (42 CFR 84, OSHA 1910.134) linked throughout. We hold no laboratory and run no breakthrough or fit testing, and we publish no customer-rating aggregate for any product, because we have no customers to aggregate. Where the published record is silent we say so rather than fill the gap.
Our methodology
This review is compiled from MSA’s published cartridge literature, the NIOSH approval record, the live listing, and the regulatory text. The score is an editorial judgment of approval fit, facepiece compatibility, hazard coverage and value — not a measured result, not a breakthrough test, and not an average of user ratings. Approved substances and the approval number for your exact part should be confirmed on the NIOSH Certified Equipment List and on the cartridge itself; where a listing and an approval disagree, the approval governs.
Researched and written by Steven Eaton, editor of WC Safety. Steven holds no safety certification and does not test products; this page compares what manufacturers publish, with the gaps in that record marked. Last reviewed July 2026.
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