Best Moldex Respirator Cartridges

Which Moldex cartridge is right for your hazard?

Best Moldex cartridge overall for most industrial hazards: the Moldex 7600 Smart Multi-Gas cartridge — NIOSH-approved, ESLI-equipped, and compatible with every Moldex 7000-series half-mask and 9000-series full-face respirator. If you need P100 particulate protection added, the Moldex 7667 Smart combination cartridge adds a pre-installed P100 filter. If your only hazard is organic vapor or acid gas at a known, monitored concentration, the Moldex 7300 OV+AG cartridge is the sharpest budget option on the platform. Browse the full Moldex respirator cartridges and filters collection for every available configuration.

Best Moldex Respirator Cartridges: Complete Buyer's Guide (2026)

The best Moldex respirator cartridges are not interchangeable — the right cartridge depends on which contaminant class you are actually exposed to, whether your program uses ESLI or a written change-out schedule, and whether you need particulate filtration added. Moldex's 7000-series cartridge platform covers six distinct hazard classes: organic vapor (OV), organic vapor plus acid gas (OV+AG), multi-gas Smart with end-of-service-life indicator (ESLI), P100 particulate filters, ammonia/methylamine, and combination cartridges that stack gas protection with P100 filtration in a single housing. All are NIOSH-approved under 42 CFR 84 and rated for use under OSHA 29 CFR 1910.134.

This guide ranks the seven best Moldex cartridges for 2026, matched to the hazards each addresses. Every product entry includes verified pricing, user ratings, a pros/cons breakdown, a dual purchase CTA, and clear notes on OSHA program implications. For the underlying hazard classification logic — when OV suffices vs. when you need OV+AG vs. when you need multi-gas — see our OV vs. OV+AG vs. multi-gas cartridge guide. For the ESLI vs. written schedule decision, see our ESLI vs. written change-out schedule guide.

Editorial verdict — best Moldex respirator cartridge overall: the Moldex 7600 Smart Multi-Gas+ESLI cartridge for programs relying on ESLI; the Moldex 7667 Smart combo where particulate protection is required alongside gas/vapor. Full rankings and pricing below.

Best Moldex cartridges 2026 — quick picks by category

1. Moldex 7600 Smart Multi-Gas Cartridge — Best overall Moldex cartridge

NIOSH class: OV/P100 + Acid Gases + Organic Vapor · ESLI: Yes · Price: the listed price/pair · Rating: 4.7/5

The Moldex 7600 Smart is the default best Moldex respirator cartridge for programs protecting against organic vapors, acid gases, and formaldehyde simultaneously. The "Smart" designation means the 7600 integrates Moldex's ESLI (End-of-Service-Life Indicator) — a color-changing chemical indicator strip visible on the cartridge face that turns from yellow-green to gray as the sorbent bed approaches saturation. This eliminates the administrative burden of a written change-out schedule for the contaminants the 7600 is approved against. Under OSHA 29 CFR 1910.134(d)(3)(iii)(B)(1), a NIOSH-approved ESLI is the explicit alternative to a written change-out schedule; the 7600 satisfies that requirement without additional industrial hygiene cost.

The 7600 protects against organic vapors, chlorine, hydrogen chloride, sulfur dioxide, hydrogen sulfide (escape), and formaldehyde. It does not include integrated P100 particulate filtration — for mixed gas/vapor and particulate hazards, step up to the Moldex 7667 Smart combo or mount the Moldex 7740+ IonicAir P100 filter on top of the 7600 using the platform's stacking system. For the direct cartridge-upgrade comparison, see our Moldex 7100 vs. 7300 vs. 7600 upgrade guide. Browse all options in the Moldex cartridges collection.

Related: ESLI vs. written change-out schedule — full compliance guide · Browse Moldex cartridges

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2. Moldex 7300 OV+AG Cartridge — Best budget Moldex cartridge

NIOSH class: OV + Acid Gas · ESLI: No · Price: the listed price/pair · Rating: 4.3/5

The Moldex 7300 is the correct budget Moldex cartridge for programs with a written change-out schedule that cover organic vapor plus acid gas at well-characterized concentrations. It is NIOSH-approved for organic vapors and acid gases including chlorine, hydrogen chloride, sulfur dioxide, and chlorine dioxide. The 7300 does not have ESLI; change-out timing must be determined by your industrial hygienist and documented in a written schedule under OSHA 1910.134(d)(3)(iii)(B)(2). It offers meaningfully better hazard coverage than the older 7100 (OV only) at the same price point — if your cartridge inventory still includes 7100s, the 7300 is the direct upgrade at no additional cost. See our Moldex 7100 vs. 7300 vs. 7600 upgrade guide for a full comparison.

The 7300 is the right choice when: (1) your SDS shows both organic vapors and acid gas hazards, (2) you have a documented written change-out schedule from a certified industrial hygienist, and (3) cost is a primary driver over the ESLI convenience premium. Programs without a written schedule should default to the Moldex 7600 Smart instead. The Moldex 7100 (OV only) is the correct step-down if acid gas is definitively absent; the 7300 covers both and should be preferred at identical pricing. See the full Moldex cartridges and filters collection.

Related: Moldex 7100 OV cartridge · OV vs. OV+AG vs. multi-gas selection guide

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3. Moldex 7740+ IonicAir P100 Particulate Filter — Best P100 filter on the Moldex platform

NIOSH class: P100 particulate (99.97%) · ESLI: N/A · Price: the listed price/pair · Rating: 4.6/5

The Moldex 7740+ IonicAir is the best P100 filter for the Moldex platform when particulate is the primary or sole inhalation hazard. The IonicAir designation indicates Moldex's electrostatic enhanced media — the same 99.97% NIOSH P100 particle capture at 0.3 microns as any P100, but with lower breathing resistance at equivalent flow rates. That translates to measurably less exhalation effort on extended shifts involving physical labor: welding, grinding, sanding, abrasive blasting, and pharmaceutical manufacturing. P100 particulate filters are change-out-on-schedule items — unlike sorbent cartridges, the P100 filter does not chemically saturate; it is replaced when flow resistance increases perceptibly or when physical integrity is compromised.

The 7740+ is a standalone filter, not a combination cartridge — it provides no gas or vapor protection on its own. For environments with both particulate and gas hazards, either stack the 7740+ on top of a Moldex 7600 Smart cartridge, or use the integrated Moldex 7667 Smart combo. For a full comparison of the Moldex P100 filter lineup including the standard 7740 and the 7760 nuisance OV variant, see our Moldex 7740 vs. 7740+ vs. 7760 filter guide. For the P100-vs-N100 comparison, see our P100 vs. N100 vs. N95 industrial particulate guide. Both the standard Moldex 7740 and the 7740+ IonicAir are available in the Moldex cartridges and filters collection.

Related: Moldex 7760 P100 + nuisance OV/AG filter · P100 vs. N100 vs. N95 guide

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4. Moldex 7667 Smart Multi-Gas + P100 Combo Cartridge — Best combination cartridge

NIOSH class: Multi-Gas + P100 combination · ESLI: Yes · Price: ~the listed price/set · Rating: 4.8/5

The Moldex 7667 Smart is the highest-rated cartridge on this list and the correct selection when your hazard profile requires simultaneous gas/vapor and particulate protection under a single NIOSH approval. It integrates the multi-gas sorbent bed of the Moldex 7600 Smart with a factory-installed P100 particulate filter in a single molded housing — no stacking required, no separate filter purchase, no alignment concerns. The ESLI on the 7667 monitors the gas/vapor sorbent bed; the P100 media is changed on a fixed schedule or when breathing resistance increases. This combination earns the highest user rating of any Moldex cartridge we reviewed (4.8/5) — the combination of ESLI convenience, broad hazard coverage, and the compact single-housing design consistently drives positive field feedback.

The 7667 Smart applies to the widest range of industrial environments: painting and coating operations, welding in enclosed spaces with welding fume and solvent vapor, pharmaceutical manufacturing, and general chemical processing where both gas and aerosol hazards co-exist. For a full discussion of when to use combination cartridges vs. separate stacked filters, see our combination cartridge vs. separate filter guide. Compare to the Moldex 7367 (OV+AG+P100, no ESLI) for programs with a written change-out schedule and narrower hazard scope. Browse the Moldex cartridges collection for in-stock inventory.

Related: Combination cartridge vs. stacked filter — when each applies · Moldex 7467 AM+P100 combo

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5. Moldex 7400 Ammonia/Methylamine Cartridge — Best Moldex cartridge for ammonia

NIOSH class: Ammonia / Methylamine · ESLI: No · Price: ~the listed price/pair · Rating: 4.4/5

The Moldex 7400 is the only dedicated ammonia/methylamine cartridge in the Moldex 7000-series lineup and the correct selection for any operation where ammonia is the primary gas hazard. Ammonia (NH3) and methylamine are not captured by organic vapor sorbent — activated carbon beds in standard OV cartridges have essentially no capacity for ammonia at industrial concentrations. The 7400 uses a specialty sorbent formulation NIOSH-approved for ammonia and methylamine under 42 CFR 84, and it is the legally required cartridge under OSHA 1910.134 for any ammonia-containing environment where air-purifying respirator protection is assigned.

Typical ammonia exposure scenarios requiring the 7400: anhydrous ammonia handling in agricultural and refrigeration applications, ammonia-based cleaning compounds in food processing, wastewater treatment operations, and fertilizer manufacturing. The 7400 does not provide organic vapor or acid gas protection beyond its rated ammonia/methylamine approval — where mixed ammonia and acid gas or OV hazards exist, consult your industrial hygienist. For environments with both ammonia and particulate hazards, see the Moldex 7467 AM+P100 combination cartridge. The higher unit price reflects the specialty sorbent formulation. Change-out must follow a written schedule; no ESLI is available for ammonia cartridges. Browse the full Moldex cartridges collection and pair with a Moldex half-mask respirator.

Related: Moldex 7467 AM/methylamine + P100 combo cartridge · OV vs. OV+AG vs. multi-gas cartridge selection

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Related reference

Related on this site: moldex 7000 vs 3m 6000 series half-mask respirator — 2026 platform, moldex 7600 smart vs 3m 6006 multi-gas cartridge — 2026 esli comparison, how to choose a respirator cartridge: complete selection guide, moldex 7100 vs 7300 vs 7600 smart — which cartridge to buy, moldex 7367 vs 7467 vs 7667 combo cartridge — which one for your hazard, and moldex 7667 vs 3m 60926 multi-gas p100 combo — 2026 comparison.

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Our methodology

Figures come from the regulation and the published specification, in that order. Derated numbers are calculated, not estimated. Nothing here is presented as a measured result, because we measure nothing.

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 and regulators publish, with the gaps in that record marked. Last reviewed August 2026.

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