Moldex 7200 Acid Gas Cartridge Review — Honest Buyer's Guide for Pure Acid Gas Environments
Is the Moldex 7200 the right acid gas cartridge — or do you actually need OV+AG?
Short answer: Most industrial buyers need the Moldex 7300 OV+AG cartridge, not the 7200. The 7200 is a dedicated acid gas cartridge approved only for pure acid gas environments — it provides zero protection against organic vapors. If your industrial hygienist has confirmed your exposure profile contains acid gases with no organic vapor co-exposure, the 7200 is the correct choice. Otherwise, buy the 7300. This review explains exactly when each applies.
Moldex 7200 Acid Gas Respirator Cartridge Review (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). At $36.23 per pair, it is priced competitively within the Moldex cartridge family.
WC Safety Editorial Verdict★★★★☆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.
GET THIS CARTRIDGE
As an Amazon Associate, WC Safety earns from qualifying purchases. Prices and availability are subject to change. Full affiliate disclosure.
Pros and Cons
Pros
- NIOSH-approved under 42 CFR Part 84, AG class
- Chemically-treated sorbent optimized specifically for acid gas adsorption
- Protects against five major acid gas hazards: HCl, Cl₂, HF, SO₂, H₂S
- Bayonet mount — tool-free installation and removal on all Moldex 7000/8000/9000 facepieces
- Competitive price at $36.23/pair within the Moldex cartridge family
- APF 10 (half-mask) or APF 50 (full-face) depending on facepiece
- Sold as pair — both cartridges ship together, no single-unit sourcing confusion
Cons
- AG-only — zero OV protection; wrong choice for any mixed chemical environment
- No ESLI — requires written employer change schedule (OSHA 29 CFR 1910.134)
- Moldex-proprietary bayonet: incompatible with 3M, Honeywell, MSA, Scott facepieces
- Does not protect against ammonia, methylamine, particulates, or CO
- Most buyers should purchase the Moldex 7300 OV+AG instead
- No particulate filtering without adding a separate P100 filter disc
Who Should Buy the Moldex 7200
Buy the 7200 if your industrial hygienist has confirmed these conditions
- Chlorine water treatment and disinfection — Cl₂ gas handling at municipal water treatment plants, pool chemical facilities, or industrial disinfection operations where organic solvent co-exposure is not present.
- Hydrogen fluoride semiconductor etching — HF etching baths and wet-bench operations in semiconductor fabs, MEMS manufacturing, and glass etching where the chemical profile is confirmed inorganic acid only.
- Concentrated inorganic acid laboratory work — HCl, H₂SO₄ (sulfuric acid mist), HF, or SO₂ work in research or analytical lab settings where solvents and organic compounds are not part of the same exposure scenario.
- Sulfur dioxide utility and industrial work — SO₂ exposures in paper mills (kraft process), sulfuric acid manufacturing, or power plant scrubber maintenance where OV co-exposure is not present.
- Emergency preparedness for chlorine or acid gas release response — facilities maintaining dedicated acid gas cartridge inventories for HazMat response teams operating in pure inorganic acid gas scenarios.
Do not buy the 7200 if any of these apply
- Your work involves any solvent use — paints, coatings, adhesives, degreasers, cleaning agents, thinners, or any compound listed as an organic vapor hazard in your SDS.
- You are not sure whether your environment has organic vapor co-exposure — if in doubt, use the Moldex 7300 OV+AG.
- You need ammonia or methylamine protection — use an ammonia-specific or multi-gas cartridge.
- You need particulate protection — the 7200 has no filter media. Add Moldex P100 filter discs or step up to the Moldex 7367 OV+AG+P100 combination.
Critical safety note: Using an AG-only cartridge in an environment with organic vapor co-exposure provides zero protection against those organic vapors. The wearer will have no sensory warning that protection is inadequate. Always confirm the full chemical hazard profile with an industrial hygienist before specifying any cartridge type.
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's green color coding conforms to the ANSI/ISEA 110 color-coding standard for acid gas cartridges, aiding cartridge 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.
| Feature | Moldex 7200 | 3M 6002 | Honeywell North AG |
|---|---|---|---|
| NIOSH Approval | 42 CFR Part 84, AG | 42 CFR Part 84, AG | 42 CFR Part 84, AG |
| Protection Class | Acid Gas only | Acid Gas only | Acid Gas only |
| Mount Type | Moldex bayonet (proprietary) | 3M bayonet (proprietary) | North bayonet (proprietary) |
| Compatible Facepieces | Moldex 7000, 8000, 9000 series | 3M 6000, 7000 series | Honeywell North 5500, 7600 series |
| Cross-Platform Compatible | No | No | No |
| ESLI | None | None | None |
| Color Code | Green (ANSI) | Green (ANSI) | Green (ANSI) |
| Sold As | Pair | Pair | Pair |
| Price (approx.) | $36.23/pair | ~$18–22/pair | ~$20–26/pair |
| Amazon | VIEW → | VIEW → | VIEW → |
As an Amazon Associate, WC Safety earns from qualifying purchases. Prices and availability are subject to change. Full affiliate disclosure.
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.
| Feature | Moldex 7200 (AG Only) | Moldex 7300 (OV+AG) | Moldex 7600 Smart (Multi-Gas) |
|---|---|---|---|
| Protection — Acid Gases | Yes (full AG class) | Yes (full AG class) | Yes |
| Protection — Organic Vapors | No — zero OV protection | Yes | Yes |
| Protection — Ammonia/MeNH₂ | No | No | Check product specs |
| NIOSH Approval Class | AG | OV/AG | Multi-gas |
| Sorbent Type | Chem-treated AC (AG-optimized) | Blended AC (OV+AG) | Multi-layer blended sorbent |
| Best For | Pure acid gas environments only | Mixed OV+AG industrial environments | Complex multi-hazard environments |
| Correct for Most Industrial Buyers? | Rarely — only with IH confirmation | Yes — default OV+AG choice | When multi-gas approval needed |
| Price (approx.) | $36.23/pair | Similar range | Higher |
| Amazon | 7200 → | 7300 → | 7600 → |
Decision Rule: 7200 vs 7300 vs 7600
- Buy the Moldex 7200 if: Your industrial hygienist has reviewed your full chemical exposure profile and confirmed that inorganic acid gases are the only chemical class present, with zero organic vapor co-exposure from any source — including adjacent operations, cleaning agents, or process off-gassing.
- Buy the Moldex 7300 if: Your environment involves any mix of organic vapors and acid gases, or if you are not certain whether OVs are present. The 7300 is the default correct choice for most manufacturing, chemical processing, coatings, and general industrial applications.
- Buy the Moldex 7600 Smart if: Your application requires multi-gas NIOSH approval covering a broader hazard profile, or your compliance program requires smart cartridge features for change-schedule documentation.
As an Amazon Associate, WC Safety earns from qualifying purchases. Prices and availability are subject to change. Full affiliate disclosure.
Shop Moldex AG Cartridge Options
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.
| Facepiece Series | Models | Type | APF with 7200 | WC Safety |
|---|---|---|---|---|
| Moldex 7000 Series | 7001 (S), 7002 (M), 7003 (L) | Half-mask | 10 | View → |
| Moldex 8000 Series | 8001 (S), 8002 (M), 8003 (L) | Half-mask | 10 | See half-mask collection |
| Moldex 9000 Series | 9001 (S), 9002 (M), 9003 (L) | Full-face | 50 | View → |
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.
Shop Compatible Moldex Facepieces
As an Amazon Associate, WC Safety earns from qualifying purchases. Prices and availability are subject to change. Full affiliate disclosure.
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.
Why this matters for change scheduling: Because the chemisorption reaction is irreversible and the reagent bed is finite, acid gas cartridge capacity is directly dependent on cumulative acid gas exposure — concentration multiplied by time. A cartridge used at 0.5 ppm HCl for 8 hours has consumed more capacity than one used at 0.5 ppm for 4 hours. The absence of an ESLI on the 7200 means employers must calculate this consumption proactively and establish a change schedule before breakthrough is possible. NIOSH's available guidance on change schedules and the AIHA (American Industrial Hygiene Association) published decision logic remain the authoritative resources for this calculation.
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 stocked at WC Safety.
Total Cost of Ownership
The 7200's sticker price is $36.23 per pair. 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.
| Cost Element | One-Time | Per Worker / Year (est.) | Notes |
|---|---|---|---|
| Moldex 7000 Half-Mask Facepiece | ~$25–35 | Replace as needed | Annual inspection; replace if degraded silicone or cracked harness |
| Moldex 7200 Cartridges (pair) | — | $36.23 × change frequency | Daily users on written change schedule: factor 52–260 pairs/year per worker |
| Fit Testing (OSHA 1910.134) | — | ~$25–75 (annual) | Required annually for each worker; more if facial changes occur |
| Written Change Schedule Development | $0–$500+ (IH consult) | Review on process change | No ESLI = mandatory written schedule; IH review cost varies by facility |
| Moldex 7740 P100 Filter (if needed) | — | ~$10–15/pair | Required if particulate co-exposure present; see Moldex 7740 |
| Training and Medical Evaluation | — | Facility-specific | OSHA 1910.134 requires initial training and annual medical eval |
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 stocked options at WC Safety.
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.
As an Amazon Associate, WC Safety earns from qualifying purchases. Prices and availability are subject to change. Full affiliate disclosure.
Frequently Asked Questions — Moldex 7200 Acid Gas Cartridge
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.
What is the difference between the Moldex 7200 and Moldex 7300?
The Moldex 7200 provides acid gas protection only (NIOSH AG class) with no organic vapor protection. The Moldex 7300 provides combined organic vapor plus acid gas protection (NIOSH OV/AG class). The 7200 is appropriate only when an industrial hygienist has confirmed pure acid gas exposure with zero OV co-exposure. The 7300 is the correct default choice for any environment where both chemical classes may be present, which describes the majority of industrial workplaces. If you are unsure which to use, choose the 7300.
Does the Moldex 7200 protect against ammonia or methylamine?
No. The Moldex 7200 is approved for inorganic acid gases only. It does not protect against ammonia (NH₃), methylamine (CH₃NH₂), or any amine compound. Ammonia and methylamine require a separate NIOSH-approved ammonia/methylamine cartridge or a multi-gas cartridge that includes ammonia in its approval class. Using the 7200 in an ammonia environment will not provide ammonia protection.
Can I add a P100 particulate filter to the Moldex 7200 for combined protection?
Yes. The Moldex platform supports separate P100 filter discs that attach to the facepiece in combination with cartridges. If your acid gas environment also involves particulate hazards — acid mists, fumes, or nuisance dusts — add Moldex P100 filter discs alongside the 7200 cartridges. See the Moldex 7740 P100 filter for the compatible P100 option in the Moldex system. Alternatively, the Moldex 7367 OV+AG+P100 combination cartridge provides all three protection classes in a single unit.
How does acid gas cartridge sorbent chemistry differ from OV cartridges?
Organic vapor cartridges use untreated activated carbon that adsorbs OV molecules through physical adsorption (Van der Waals forces). Acid gas cartridges use activated carbon that has been impregnated with an alkaline reagent — typically a potassium compound — that chemically reacts with and neutralizes acidic gas molecules through chemisorption. This reaction is irreversible and consumes the reagent, which is why acid gas cartridges have a finite capacity that depends on cumulative acid gas exposure. The chemical treatment that makes the 7200 effective against acid gases also makes it ineffective against organic vapors, which is why AG-only and OV-only cartridges are not interchangeable.
Is the Moldex 7200 OSHA-compliant for use in regulated workplaces?
Yes, when used within a complete, OSHA-compliant respiratory protection program under 29 CFR 1910.134. Compliance requires: a written respiratory protection program, medical evaluation of the worker, annual fit testing for the specific facepiece model, training, and a written change schedule for the cartridges (required because there is no ESLI). Cartridge selection must match the confirmed exposure profile. Using a NIOSH-approved cartridge alone does not constitute compliance — the full program requirements apply.
What Moldex half-mask sizes are available for use with the 7200 cartridge?
The Moldex 7000 series half-mask is available in three sizes: 7001 (Small), 7002 (Medium), and 7003 (Large). All three sizes accept the 7200 cartridge via the Moldex bayonet mount. Correct sizing is critical for achieving the face seal required by OSHA — annual quantitative or qualitative fit testing must be conducted with the specific size used by each worker. A cartridge provides no protection if the facepiece does not form a proper seal.
Where can I find a complete guide to acid gas respirator cartridge selection?
WC Safety publishes reference and buyer's guide content covering respirator cartridge selection across all NIOSH approval classes. For acid gas environments specifically, see best respirator cartridge for acid gas environments. For cartridge identification by color coding, see the respirator cartridge color chart. For general cartridge selection methodology, see how to choose a respirator cartridge. The full Moldex cartridge collection lists all stocked options at WC Safety.
Why Trust This Review
WC Safety is a specialized PPE retailer focused on industrial respiratory protection, ANSI-rated eye protection, and OSHA-regulated safety equipment. Our editorial team reviews respirator cartridges, filters, and facepieces against NIOSH approval documentation, OSHA regulatory requirements, and published industrial hygiene guidance — not against manufacturer marketing claims.
We do not conduct independent laboratory testing. Our assessments are grounded in regulatory specifications (42 CFR Part 84, OSHA 29 CFR 1910.134, ANSI/ISEA standards), NIOSH approval records, and publicly available industrial hygiene literature including AIHA technical guidance. We identify limitations and misapplication risks, including cases where buyers should purchase a different product than the one being reviewed.
Product pricing is verified at time of publication. Internal links reference only verified WC Safety URLs. Amazon affiliate links are labeled per FTC requirements. No external party compensated or directed the content of this review.
By Steven Eaton, WC Safety Editorial
Steven Eaton is the editor of WC Safety's respiratory protection content library. His coverage focuses on OSHA 1910.134 compliance, NIOSH cartridge selection, and industrial PPE specification for manufacturing, chemical processing, and utility environments.
Published: June 9, 2026 | Review applies to: Moldex 7200 Acid Gas Respirator Cartridge (ASIN B015MG3Y2C)
Methodology: This review is based on published NIOSH approval documentation for the Moldex 7200 under 42 CFR Part 84 (AG class), OSHA 29 CFR 1910.134 regulatory requirements, Moldex published technical specifications, and AIHA guidance on cartridge change schedules. Competitive pricing for cross-brand cartridges reflects published Amazon listings at time of writing and is approximate. No independent laboratory testing was conducted. Ratings reflect regulatory compliance scope, stated application breadth, platform compatibility, and buyer applicability relative to competing Moldex options. The rating is not a safety endorsement — all products referenced carry equivalent NIOSH approval for their respective classes.
Affiliate Disclosure: WC Safety participates in the Amazon Associates Program. Links to Amazon on this page are affiliate links — WC Safety earns a commission on qualifying purchases at no additional cost to you. Amazon links are labeled with "rel=sponsored nofollow noopener" per FTC and Google requirements. Affiliate relationships do not influence product ratings, recommendations, or editorial content. The Moldex 7200 rating of 4.1/5 and all limitations identified in this review were determined editorially without input from Moldex or Amazon. Read our full affiliate disclosure policy.
No sponsored content: This review was not sponsored by Moldex, Amazon, or any distributor. WC Safety is an independent retailer. Product facts and NIOSH approval data are sourced from public regulatory records.
No sponsored content: This review was not sponsored by Moldex, Amazon, or any distributor. WC Safety is an independent retailer. Product facts and NIOSH approval data are sourced from public regulatory records.