Moldex 7200 review — Moldex 7200 Respirator Cartridge

Short answer: this Moldex 7200 review covers a acid gas cartridge for the Moldex 7000/9000 bayonet system. What a cartridge protects against is decided by its NIOSH approval class, never by its color or its price, and no cartridge of any class may be worn in an IDLH or oxygen-deficient atmosphere. Read the pack-quantity warning below before costing out a change-out cycle. Our editorial verdict: 4.1/5 — an editorial score, not a customer rating.

Moldex 7200 review — what the NIOSH class actually covers

The short version of this moldex 7200 review: buy on the approval class, confirm the pack quantity on the listing, and never take an air-purifying cartridge into an IDLH atmosphere.

Pack quantity — confirm it on the listing before you order

Every one of the twelve Moldex 7000-series cartridge records checked for this review carries the same spec line — Sold as: Pair (2 cartridges) — including the SKUs this and its sibling reviews describe as single units. Twelve identical values across products that are not all packaged alike is the signature of a template default, not of twelve verified pack counts, so treat the pack quantity as unconfirmed. Any per-cartridge or per-mask cost figure in this review is therefore conditional on the pack size you actually receive. Read the quantity on the seller’s listing, or on the Moldex packaging itself, before ordering a change-out cycle’s worth.

Pros and Cons — condensed

Pros: NIOSH approval class stated from the label, honest scope limits, bayonet compatibility spelled out. Cons: pack quantity is unconfirmed on the listing, and an air-purifying cartridge is the wrong tool the moment the atmosphere is IDLH or oxygen-deficient.

Why trust this review

WC Safety is an independent review site. It sells nothing — no inventory, no warehouse, no order desk, no quote desk. Purchase links earn an affiliate commission at no extra cost to you, and no manufacturer pays for placement or for a rating. This page previously carried seller language it was not entitled to and an affiliate tag that did not match its own disclosure; both are corrected. Reviewed by Steven Eaton, WC Safety Editorial, who holds no safety certification.

Our methodology

Cartridge scope is taken from the NIOSH approval class printed on the cartridge and its approval label, not from catalog copy — the approval number is the only claim that means anything. We run no laboratory tests. Selection and change-out scheduling are governed by OSHA 29 CFR 1910.134; approvals are searchable in the NIOSH Certified Equipment List. No air-purifying cartridge of any class may be worn in an IDLH or oxygen-deficient atmosphere.

Moldex 7200 Acid Gas Respirator Cartridge Review (2026)

Published June 10, 2026 · Last updated July 27, 2026

Acid gas cartridges occupy a narrow, specific lane in the respiratory protection market. Unlike organic vapor (OV) cartridges or multi-gas combinations, an AG-only cartridge is engineered for a single chemical class — inorganic acid gases — and nothing else. That specificity is both its strength and its primary limitation.

The Moldex 7200 is the company's dedicated acid gas cartridge, carrying NIOSH approval under 42 CFR Part 84 for the AG class. It uses chemically-treated activated carbon optimized for acid gas adsorption rather than the broader-spectrum sorbent blend found in OV or OV+AG cartridges. The sorbent treatment allows the 7200 to deliver strong, targeted protection against hydrogen chloride (HCl), chlorine (Cl₂), sulfur dioxide (SO₂), hydrogen fluoride (HF), and hydrogen sulfide (H₂S) — the core inorganic acid gas hazards found in chemical processing, semiconductor manufacturing, water treatment, and laboratory environments.

Within the Moldex cartridge lineup, the 7200 sits between the OV-only Moldex 7100 and the combination Moldex 7300 OV+AG. The 7300 is almost always the correct choice for mixed industrial environments. The 7200 is the correct choice only when an industrial hygienist has confirmed pure acid gas exposure with zero organic vapor co-exposure. That scenario is less common than most buyers assume.

The cartridge is sold as a pair, fits the full Moldex 7000, 8000, and 9000 series facepieces via the brand's proprietary bayonet mount, and carries no End-of-Service-Life Indicator (ESLI) — requiring employers to implement a written change schedule under OSHA 29 CFR 1910.134(d)(3)(ii).

WC Safety Editorial Verdict

4.1 / 5

★★★★☆

The Moldex 7200 is a well-built, NIOSH-approved acid gas cartridge that does exactly what it claims. The sorbent chemistry is purpose-optimized for acid gas adsorption, the bayonet fit on Moldex facepieces is secure and tool-free, and the price per pair is reasonable for a single-application cartridge. For the narrow set of environments where AG-only protection is confirmed appropriate — chlorine water treatment, HF semiconductor etching, concentrated inorganic acid lab work with no solvent use — this cartridge performs reliably.

The score is capped at 4.1 for two structural reasons: the cartridge's AG-only sorbent means it provides no protection against organic vapors, which disqualifies it from the vast majority of mixed industrial environments; and the absence of an ESLI places the full burden of change-schedule compliance on the employer. The Moldex 7300 OV+AG is the correct choice for most buyers reading this review. If your application is genuinely pure acid gas, the 7200 earns its rating.

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Pros and Cons

Who Should Buy the Moldex 7200

What the Moldex 7200 Does Well

Purpose-Optimized Acid Gas Sorbent Chemistry

The 7200's activated carbon is chemically treated specifically for acid gas adsorption — a different sorbent formulation than the untreated or partially-treated carbon used in OV cartridges. Acid gases such as HCl and HF require an alkaline-impregnated sorbent to chemisorb effectively; the treatment in the 7200 is optimized for this reaction. In a pure acid gas environment, this targeted chemistry can outperform a generic OV+AG combination cartridge on a per-unit-of-sorbent basis because the entire sorbent bed is allocated to one chemical class rather than split across multiple hazard types.

Broad Acid Gas Coverage in One Cartridge

A single 7200 cartridge provides NIOSH-approved protection against the five major inorganic acid gas hazards workers encounter in chemical, semiconductor, and utility environments: hydrogen chloride (HCl), chlorine (Cl₂), hydrogen fluoride (HF), sulfur dioxide (SO₂), and hydrogen sulfide (H₂S). For facilities dealing with multiple acid gas hazards simultaneously — a chlorine feed system adjacent to an HCl handling area, for example — this consolidated coverage simplifies cartridge specification and inventory management compared to hazard-specific alternatives.

Tool-Free Bayonet Mount on Moldex Facepieces

The Moldex proprietary bayonet connection installs and removes without tools. On Moldex 7000/8000 series half-masks and 9000 series full-face respirators, the cartridge clicks into place with a quarter-turn and releases cleanly. There is no thread-stripping risk associated with threaded connections, and cartridge changeout time in the field is minimal. For facilities running shift-based change schedules, this matters operationally. The fit is mechanically positive — there is no ambiguity about whether the cartridge is properly seated.

NIOSH Approval and Regulatory Compliance

The 7200 carries formal NIOSH approval under 42 CFR Part 84 for the AG (Acid Gas) approval class. This approval is the regulatory baseline required for use in OSHA-regulated workplaces under 29 CFR 1910.134. Facilities subject to EPA or DOE respiratory protection requirements will find the NIOSH certification supports compliance documentation. The cartridge carries the white acid-gas color code required on NIOSH-approved cartridges (42 CFR 84.193 / ANSI K13.1), aiding identification during inspection and donning.

Compatible with the Full Moldex Cartridge Platform

For facilities already standardized on Moldex facepieces, the 7200 slots directly into existing respiratory protection infrastructure. It is compatible with the Moldex 7000 series half-mask (7001, 7002, 7003 in S/M/L), the Moldex 8000 series, and the Moldex 9000 series full-face respirator (9001, 9002, 9003). No new facepiece procurement is required when transitioning from OV to AG cartridges within the same Moldex platform, which simplifies fit-test record management and user training.

Where the Moldex 7200 Falls Short

AG-Only Sorbent — Zero Organic Vapor Protection

This is the defining limitation. The 7200's chemically-treated sorbent is optimized for acid gas adsorption at the expense of organic vapor adsorption. A worker wearing the 7200 in an environment with any OV co-exposure — even low-level solvent vapors from nearby operations — receives no protection against those organic compounds. There is no breakthrough warning. The wearer will not detect the failure of protection until symptoms of exposure develop. This is not a design defect — it is a correct engineering tradeoff for a dedicated acid gas cartridge — but it means the consequence of misapplication is severe. The Moldex 7300 OV+AG is the appropriate choice whenever there is any uncertainty about OV co-exposure, and it is the higher-volume product in most industrial procurement scenarios for this reason.

No End-of-Service-Life Indicator (ESLI)

The 7200 has no ESLI — no color-changing indicator, no smell-based breakthrough warning calibrated to a regulatory threshold. Under OSHA 29 CFR 1910.134(d)(3)(ii), employers must implement a written change schedule based on objective information when cartridges lack an ESLI. That schedule must account for exposure concentration, cartridge capacity at the applicable concentration, work duration, temperature, and humidity. For facilities without an in-house industrial hygienist, developing a defensible change schedule requires external consultation or use of NIOSH's CBRN decision logic tools. This administrative requirement adds compliance overhead that a cartridge with an ESLI would eliminate — though no commercially available acid gas cartridge for general industry currently carries an ESLI approved by NIOSH for AG service.

Moldex Platform Lock-In

The bayonet mount is Moldex-proprietary and physically incompatible with 3M, Honeywell North, MSA, Scott, Draeger, and all other manufacturers' facepieces. Facilities operating a mixed-brand respirator inventory cannot substitute the 7200 on non-Moldex facepieces. For contractors moving between client facilities or workers maintaining personal respirators that may not be Moldex, this is a practical constraint. The 3M 6002 acid gas cartridge and Honeywell North acid gas cartridges use the same 3M bayonet and RD40/North bayonet connections respectively, and serve the same NIOSH AG approval class for their own facepiece platforms.

Most Industrial Buyers Need the 7300 OV+AG Instead

A substantial proportion of buyers who search for "acid gas cartridge" and land on the 7200 should instead be purchasing the Moldex 7300 OV+AG. The 7300 combines organic vapor and acid gas protection in the same form factor at a modest price premium and is the correct choice for any mixed chemical environment where both OV and AG hazards may be present — which describes the majority of industrial operations in manufacturing, chemical processing, coatings, and facility maintenance. The 7200's existence in the Moldex lineup is justified by pure acid gas applications, but those applications are narrower than most buyers initially estimate.

Comparison: Moldex 7200 vs 3M 6002 vs Honeywell North AG Cartridge

All three are NIOSH-approved AG-class cartridges. The primary differentiators are facepiece compatibility (platform lock-in), mounting system, and pricing. Protection class is equivalent across all three for inorganic acid gas hazards.

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Takeaway: If you are already on a Moldex facepiece platform, the 7200 is the correct acid gas cartridge. If you are starting from scratch and cost is a primary driver, the 3M 6002 is lower-priced at comparable NIOSH protection. All three require an employer-written change schedule. None offer ESLI. Facepiece compatibility, not cartridge chemistry, is the deciding factor when all three meet your NIOSH protection requirement.

Moldex Acid Gas Cartridge Options: 7200 vs 7300 vs 7600

This is the most important comparison for Moldex platform users. The three cartridges share the same bayonet mount and facepiece compatibility but serve different exposure profiles.

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Compatible Respirators

The Moldex 7200 uses the Moldex proprietary bayonet mount. It is compatible with the following Moldex facepieces and will not fit any other manufacturer's half-mask or full-face respirator.

The Assigned Protection Factor (APF) of the facepiece determines the level of protection, not the cartridge alone. A half-mask with the 7200 provides APF 10 — meaning it is appropriate for acid gas concentrations up to 10 times the OSHA Permissible Exposure Limit (PEL). A full-face 9000 series with the 7200 provides APF 50, allowing use in environments up to 50× the PEL, making full-face the correct choice for higher-concentration acid gas environments.

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Understanding Acid Gas Cartridge Chemistry

Selecting the right cartridge type for acid gas protection requires understanding why standard activated carbon — the sorbent in most OV cartridges — is insufficient for acid gas adsorption at low concentrations.

Why Activated Carbon Alone Does Not Work for Acid Gases

Standard activated carbon is highly effective at adsorbing organic vapors through physical adsorption — the organic molecule is retained on the carbon surface by Van der Waals forces. Inorganic acid gases, however, have low molecular weights and are polar, making them poor candidates for physical adsorption onto unmodified carbon at the low concentrations where worker protection is required. At the OSHA PEL for hydrogen chloride (5 ppm ceiling) or chlorine (1 ppm ceiling), untreated activated carbon will not retain these molecules adequately to provide reliable protection.

Chemical Sorbent Bed: How the 7200 Works

The 7200 addresses this limitation through chemisorption. The activated carbon is impregnated with an alkaline reagent — typically potassium carbonate, potassium hydroxide, or a proprietary alkaline treatment — that reacts chemically with acidic gas molecules as they pass through the sorbent bed. The reaction converts the acid gas into a stable salt or non-volatile compound that remains bound within the cartridge. This mechanism is chemically irreversible, which is why acid gas cartridges cannot be regenerated or reused after significant exposure, and why breakthrough occurs more abruptly than with OV cartridges once the alkaline reagent is consumed.

OV+AG vs AG-Only: The Sorbent Tradeoff

In an OV+AG combination cartridge like the Moldex 7300, the sorbent bed contains both treated carbon for acid gas adsorption and untreated or lightly-treated carbon for organic vapor physical adsorption. The two sorbent layers share the cartridge volume, meaning each layer is thinner than it would be in a dedicated single-hazard cartridge of the same size. For most mixed industrial environments, this tradeoff is acceptable and the correct regulatory choice. For pure acid gas environments, the 7200's full sorbent volume allocated to acid gas chemisorption represents a theoretical service life advantage — though in practice, change schedules at most facilities are driven by shift duration rather than cartridge capacity limits.

For a broader overview of cartridge selection by hazard type, see our respirator cartridge selection guide and the respirator cartridge color chart. The full cartridge and filter collection covers all NIOSH approval classes covered on this site.

Total Cost of Ownership

But the full cost of a cartridge-based respiratory protection program extends beyond the cartridge unit price. The following table reflects typical facility-level cost factors for an acid gas respirator program using Moldex 7000 series half-masks and 7200 cartridges.

For facilities evaluating whether to standardize on the 7200 versus the 7300, the cartridge unit cost difference is typically small relative to the fit-test, training, and administrative compliance costs that apply equally to both. The more material decision is selecting the correct protection class for the exposure profile — an underprotection incident with the wrong cartridge type carries costs far exceeding any cartridge price differential. See the full Moldex cartridge collection for the listings covered here.

Final Verdict

The Moldex 7200 is a technically sound, NIOSH-approved acid gas cartridge that performs well in the narrow set of environments it was designed for. The chemically-treated sorbent provides reliable protection against the five major inorganic acid gas hazards — HCl, Cl₂, HF, SO₂, and H₂S — and the bayonet fit on Moldex facepieces is secure, tool-free, and operationally efficient. For facilities where an industrial hygienist has confirmed pure acid gas exposure with no organic vapor co-exposure, this cartridge delivers on its specification.

The 4.1/5 rating reflects the structural constraints that limit its applicability: the AG-only sorbent means one mistaken use case — any environment with OV co-exposure — results in complete failure of chemical vapor protection with no warning to the wearer. The absence of an ESLI adds administrative compliance overhead. And the Moldex-proprietary mount means it is available only to Moldex platform users. These are not defects in the product design; they are the correct tradeoffs for a dedicated single-hazard cartridge. But they appropriately constrain the score.

Recommendation: If you are on a Moldex platform and your industrial hygienist has confirmed pure acid gas exposure — chlorine water treatment, HF etching, concentrated acid lab work with zero OV co-exposure — buy the 7200. If there is any uncertainty about OV co-exposure, or if you are in a general industrial environment, buy the Moldex 7300 OV+AG instead. The 7300 is the correct default for most industrial buyers.

For further cartridge selection guidance, see best respirator cartridge for acid gas environments, best respirator cartridge for chlorine, and how long do respirator cartridges last.

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More questions on this topic

Does the Moldex 7200 protect against organic vapors?

No. The Moldex 7200 is an acid gas cartridge with NIOSH approval under the AG class only. Its chemically-treated sorbent is optimized for inorganic acid gas adsorption and provides zero protection against organic vapors such as solvents, paints, adhesives, or any OV-listed compound. If your exposure profile includes any organic vapors alongside acid gases, you need the Moldex 7300 OV+AG cartridge, not the 7200.

What acid gases does the Moldex 7200 protect against?

The Moldex 7200 provides NIOSH-approved protection against the following inorganic acid gases: hydrogen chloride (HCl), chlorine (Cl₂), hydrogen fluoride (HF), sulfur dioxide (SO₂), and hydrogen sulfide (H₂S). It also protects against sulfuric acid mist. It does not protect against organic acids, ammonia, methylamine, or any organic vapor compound. Always consult the SDS for each chemical in your work environment to confirm whether the 7200's AG approval class covers your specific hazards.

Is the Moldex 7200 compatible with 3M respirators?

No. The Moldex 7200 uses a Moldex-proprietary bayonet mount that is physically incompatible with 3M, Honeywell North, MSA, Scott, or any other manufacturer's facepieces. It fits only Moldex 7000 series half-masks (7001/7002/7003), Moldex 8000 series half-masks, and Moldex 9000 series full-face respirators. If you use 3M facepieces, the appropriate acid gas cartridge is the 3M 6002.

How long does the Moldex 7200 last before I need to change it?

There is no universal answer — cartridge service life depends on acid gas concentration, exposure duration, temperature, humidity, and breathing rate. The Moldex 7200 has no End-of-Service-Life Indicator (ESLI). OSHA 29 CFR 1910.134(d)(3)(ii) requires employers to implement a written change schedule for cartridges without an ESLI based on objective information. Facilities should consult an industrial hygienist to develop a defensible change schedule. See how long do respirator cartridges last for general guidance on this calculation.

What is the APF (Assigned Protection Factor) for the Moldex 7200?

The APF is a function of the facepiece, not the cartridge. With a Moldex 7000 or 8000 series half-mask, the APF is 10, meaning the respirator assembly is appropriate for acid gas concentrations up to 10 times the OSHA PEL. With a Moldex 9000 series full-face respirator, the APF is 50. If your measured exposure concentration exceeds 10× the PEL, a full-face facepiece is required regardless of cartridge type.

Does the Moldex 7200 have an ESLI (End-of-Service-Life Indicator)?

No. The Moldex 7200 does not include an ESLI. No currently available general-industry acid gas cartridge carries a NIOSH-approved ESLI for AG service. The absence of an ESLI means OSHA requires a written change schedule based on objective industrial hygiene data. Employers cannot rely on odor detection or any other sensory cue as a substitute for a documented change schedule — many acid gases, including HF and HCl, may not provide adequate olfactory warning before exposure reaches harmful levels.

Can I use the Moldex 7200 for chlorine gas protection at a water treatment plant?

Yes, provided chlorine (Cl₂) is the confirmed hazard and there is no organic vapor co-exposure from maintenance chemicals, lubricants, or other process chemicals. The Moldex 7200 provides NIOSH-approved AG-class protection against Cl₂. Ensure the cartridge is used within a written change schedule, that fit testing is current for the facepiece, and that workers are trained per OSHA 1910.134. For a comprehensive overview, see best respirator cartridge for chlorine.

Does the Moldex 7200 protect against hydrogen fluoride (HF) in semiconductor etching?

Yes. The Moldex 7200 provides NIOSH AG-class protection against hydrogen fluoride (HF). Semiconductor wet-bench etching operations using HF with no organic solvent co-exposure are a direct use case for the 7200. Ensure the measured HF concentration is within the facepiece's APF (APF 10 for half-mask, APF 50 for full-face). Given HF's severe health hazards at low concentrations, many semiconductor facilities use full-face respirators with the Moldex 9000 series to achieve APF 50 for additional safety margin.