Combination Respirator Cartridges

Rated Gas Bed + Particulate in One Body · NIOSH 42 CFR 84 · 3M · MSA · Honeywell North · Moldex · GVS · Gerson

Which combination respirator cartridge do you need?

Short answer: match the rated gas class to your contaminant, then confirm the fitting matches your facepiece. For solvents, the 3M 60921 (OV/P100) is the reference. Where acids are also present, step to the 60923 (OV/AG/P100). For mixed or uncertain exposures, the 60926 multi-gas covers the widest range. MSA Comfo users want the GMC/P100; North's own connector users the 7583P100L.

Editor's pick: the 3M 60926 multi-gas P100 — when the exposure is a mixture rather than one named solvent, a multi-gas bed removes the guesswork that causes the wrong cartridge to be fitted.

Affiliate disclosure: WC Safety is an independent review site. As an Amazon Associate we earn from qualifying purchases made through links on this page, at no extra cost to you. We do not sell products directly, and no brand paid for placement.

Our methodology: how this collection was curated

We report the NIOSH approval exactly as the manufacturer states it and we separate rated protection from nuisance-level relief everywhere the two appear together, because the packaging often does not. Fitting systems are recorded per cartridge, since a cartridge that does not attach to your facepiece is not a cheaper option but a non-option. We do not convert between approval classes, we do not treat a particulate filter with an odor layer as a gas cartridge, and where a product is rated for one named gas and nuisance-relieved for the rest, we say exactly that rather than rounding it up.

Combination Respirator Cartridges (2026)

A combination cartridge exists because many real jobs put a gas or vapor and an airborne particulate in the same breath — spray painting, solvent degreasing, chemical decanting — and swapping media mid-task is not practical. Under OSHA 29 CFR 1910.134, selection has to follow an assessment of the actual contaminant, and cartridges for gases and vapors need a documented change schedule unless the cartridge carries an end-of-service-life indicator. Approvals are issued by NIOSH under 42 CFR Part 84 and every model can be checked against the CDC NIOSH-approved respirator list or the NIOSH Certified Equipment List.

What this collection covers — and the three tiers inside it

Forty-six cartridges and filters from 3M, MSA, Honeywell North, Moldex, GVS, and Gerson. They are not all the same kind of thing, and the difference is the most important thing on this page:

• 34 true combination cartridges — rated gas or vapor bed plus P100. These give real gas protection: 3M 60921 through 60928, the MSA GMA and GME Comfo series, Honeywell North 7581P100L and siblings, Moldex 7367, Gerson G73, and the GVS Elipse OV/AG/P100.
• 4 rated for one named gas — hydrogen fluoride — with nuisance relief for the rest: the 3M 7093C and its Secure Click and 2000-series equivalents. Rated for HF, not for organic vapor.
• 8 that are particulate filters only, with nuisance-level relief and no rated gas protection: 3M 2097, 2096, 2296, 2297, 2078, the Secure Click D3096 and D9093CB, and the Moldex 7760.

Specialist beds also sit here: MSA MerSorb for mercury vapor and chlorine, and the 3M 60925 for formaldehyde.

Single-hazard media live elsewhere: organic vapor respirator cartridges, acid gas cartridges, multi-gas cartridges, P100 filters, and nuisance relief respirators. See also the parent filters and cartridges hub, the facepieces in half mask and full face respirators, and — for powered systems, which take entirely different media — PAPR cartridges.

Rated bed vs nuisance relief comparison

How to choose a p100 combination cartridge correctly

What is the difference between a rated bed and nuisance-level relief?

A rated bed carries a NIOSH approval for a named gas or vapor class and is what lets you claim protection against it. Nuisance-level relief is a thin sorbent layer intended to reduce odor at concentrations already below the permissible exposure limit, and it carries no gas approval whatsoever. The practical consequence is severe: someone fitting a 3M 2097 in place of an organic vapor p100 cartridge such as the 60921 has a P100 particulate filter and nothing else against the solvent. Manufacturer labelling says "nuisance level" plainly, but the products sit side by side and look similar, which is why they are separated into tiers above. Our organic vapor vs P100 explainer works through the same distinction from the other direction.

Will any cartridge fit any respirator?

No, and this is the second most common buying error. The fitting is proprietary — 3M bayonet, 3M Secure Click, MSA Comfo, North's own connector, Moldex 7000/9000, and GVS Elipse are mutually incompatible systems, and the Secure Click D-series will not mount on a 3M bayonet facepiece despite both being 3M. Confirm the fitting against your specific facepiece before ordering, because approval applies to the complete assembly, not to the cartridge in isolation — see are respirator cartridges universal.

How long does a cartridge last, and what is an ESLI?

Gas and vapor beds have no visible end point — they load until they break through, and by then you are breathing the contaminant. OSHA therefore requires a change schedule based on the exposure, unless the cartridge carries an end-of-service-life indicator that changes color as the bed loads, as the 3M 60927 mercury cartridge does — our guide to ESLI versus a written change schedule covers how to build one. Particulate media behave differently: they get harder to breathe through as they load, which gives you a usable signal. Never judge a gas cartridge by smell — if you can smell the contaminant, breakthrough has already happened.

When must you not use an air-purifying cartridge at all?

In any oxygen-deficient atmosphere, in any atmosphere that is immediately dangerous to life or health, or where the contaminant is unidentified or unmeasured. A cartridge filters the air you are in; it does not supply air, so it cannot help where there is not enough oxygen to begin with. Those situations call for supplied-air or self-contained breathing apparatus, and no combination cartridge on this page changes that.

Do the pre-filters and retainers matter?

They do, and the attachment rules are specific rather than universal. On 3M bayonet facepieces the 2000-series filters — 2091, 2096, 2097 — attach directly to the facepiece. The 5N11 and 5P71 pre-filters do not: they require the 3M 501 filter retainer to hold them against a cartridge. Fitting a pre-filter without the correct retainer leaves it unseated, which defeats the point of adding it.

Storage, change-out, and record keeping

Store unused cartridges sealed in their original packaging. Sorbent beds adsorb from ambient air whether or not anyone is wearing them, so an unwrapped cartridge left on a shelf or fitted to a hanging respirator is quietly consuming its service life. Once a cartridge is in use, seal the facepiece in a bag between shifts rather than leaving it exposed, and follow the written change schedule rather than personal judgement — the whole reason the schedule exists is that the wearer has no reliable way to sense the bed loading.

Further reading: our 3M 60921 vs 60923 vs 60926 comparison works through the most common selection decision in this collection, the 3M filter and cartridge guide maps the whole 3M range, and the paint spray respirators collection covers the application where an acid gas p100 cartridge or an OV/P100 is most often specified.

Combination respirator cartridge FAQ

What is a combination respirator cartridge?

One cartridge body containing both a rated gas or vapor sorbent bed and a particulate filter, so a single unit covers both hazards. It is used where a job produces a gas or vapor and an airborne particulate at the same time.

Is a filter with nuisance-level relief a combination cartridge?

No. Nuisance-level relief reduces odor below the permissible exposure limit and carries no gas approval. A 3M 2097 is a P100 particulate filter with an odor layer, not a substitute for a rated OV/P100 cartridge.

Can I fit any cartridge to any respirator?

No. 3M bayonet, 3M Secure Click, MSA Comfo, North's own connector, Moldex and GVS Elipse fittings are mutually incompatible, and NIOSH approval applies to the complete assembly. Check the fitting against your facepiece before ordering.

How do I know when to change a gas cartridge?

Follow a written change schedule based on your exposure, as OSHA requires, unless the cartridge has an end-of-service-life indicator. Gas beds give no warning before breakthrough — smelling the contaminant means it is already too late.

What does the P100 part of the designation mean?

P100 is the particulate half: oil resistant, filtering at least 99.97% of airborne particles. It describes only the filter element, and says nothing about which gases the cartridge is rated for.

What is the difference between the 3M 60921, 60923 and 60926?

They differ by gas bed: the 60921 is organic vapor with P100, the 60923 adds acid gas, and the 60926 is a multi-gas bed covering the widest range. All three share the same P100 particulate element and the same 3M bayonet fitting.

Can I use these in a confined space or an IDLH atmosphere?

No. Air-purifying cartridges filter the surrounding air and cannot address oxygen deficiency or an IDLH atmosphere. Those require supplied-air or self-contained breathing apparatus.

Why are the 3M 6001 and 6006 not in this collection?

Because they are gas-only cartridges with no particulate element. They belong with the organic vapor and multi-gas cartridges; a combination cartridge by definition includes a filter.

Do 3M 2000-series filters need the 501 retainer?

No — 2091, 2096 and 2097 attach directly to a 3M bayonet facepiece. The 5N11 and 5P71 pre-filters are the ones that require the 501 filter retainer to hold them in place against a cartridge.

Do cartridges expire on the shelf?

Sorbent beds adsorb from ambient air whenever they are unsealed, so keep unused cartridges in their original packaging and observe the manufacturer's shelf-life dating. A cartridge left attached to a hanging respirator is consuming service life.

Which cartridge should I use for spray painting?

Typically an organic vapor bed with a P100 element, because paint produces both solvent vapor and aerosol. Confirm against the product's safety data sheet, since isocyanate-containing systems have specific requirements.

Are Versaflo TR-6510N cartridges the same thing?

No. Those are for powered air-purifying respirators, a different respirator class with different approvals and use limits. They are not interchangeable with negative-pressure cartridges.

Why trust WC Safety on respiratory protection?

WC Safety reviews workplace PPE full-time as an independent affiliate site — we do not sell products, hold no inventory, and accept no paid placements. On this page that independence does something specific: it lets us tell you that eight of the forty-six products here provide no rated gas protection at all, and to count them out by name rather than let the collection title imply otherwise. We separate rated beds from nuisance relief, we record fitting systems because approval covers the assembly rather than the part, and we state the hard limit that no cartridge on this page belongs in an oxygen-deficient or IDLH atmosphere. Standards referenced are NIOSH 42 CFR Part 84 and OSHA 29 CFR 1910.134. Reviewed by Steven Eaton, WC Safety editor. Last reviewed: July 2026.