Moldex 7307 Organic Vapor Acid Gas Respirator Cartridge Review

Moldex 7307 Single Organic Vapor Acid Gas Cartridge Review (2026)

The Moldex 7307 is a single-unit OV+AG replacement cartridge — one cartridge per package. Because every Moldex half-mask and full-face respirator has two cartridge ports, a complete respirator requires two units. That arithmetic defines who actually buys the 7307 versus the 7300 pair.

The protection is not diluted by the single-unit format. You get the same NIOSH approval under 42 CFR Part 84 for organic vapors and six acid gases: hydrogen chloride (HCl), chlorine (Cl2), hydrogen fluoride (HF), sulfur dioxide (SO2), and hydrogen sulfide (H2S). The Moldex bayonet mount connects to the full Moldex platform — 7000 series half-masks, Moldex 7800, and the 9000 series full-face.

What changes with the single format is economics and use-case fit. Spray painting a piece of equipment once a quarter, replacing a cartridge that was damaged on one side, or stocking a first-aid cabinet for infrequent acid gas exposure — those are 7307 scenarios. Daily production work in a chemical plant is a 7300 pair scenario. This review covers both so you can decide.

Pros and Cons

Who Should Buy the 7307 vs. the 7300 Pair

The cartridge chemistry is identical — the decision is entirely about format, quantity, and economics.

Bottom line on economics: Two 7307 singles at the listed price each totals the listed price. The 7300 pair costs approximately the listed price — roughly the listed price more but gives you both cartridges at once with no risk of mismatching. For most wearers who replace both sides simultaneously, the pair is the smarter buy. The 7307 single wins only when you genuinely need one cartridge.

What the Moldex 7307 Does Well

Dual OV+AG Protection in One Cartridge

Many workers face simultaneous solvent vapor and acid gas exposure — spray paint lines where isocyanates and solvents coexist, chemical processing where HCl and organic solvent vapors are both present, and semiconductor fab environments where HF and organic solvents are used in adjacent steps. The 7307 addresses both hazard classes with a single cartridge, eliminating the need to stack or layer filters. NIOSH approval under 42 CFR Part 84 covers Organic Vapor (OV) and Acid Gas (AG) as combined classes, not separate layers. This matters for compliance documentation under OSHA respiratory protection requirements.

Deep Integration with the Moldex Platform

The 7307 uses the Moldex proprietary bayonet mount — the same connection system used across the entire Moldex cartridge line. It fits the 7000 series half-masks (7001, 7002, 7003 — small, medium, large), the Moldex 7800 series half-mask, and the 9000 series full-face respirators (9001, 9002, 9003). No adapter. No compatibility guesswork. If you already own any of these masks, the 7307 drops in directly. The bayonet click-lock is tool-free and audible — you know the cartridge is seated before exposure begins.

Individual Cartridge Replacement Logic

Cartridges do not always fail symmetrically. A cartridge that takes mechanical impact on one side, or one that is exposed to higher concentrations on the dominant-hand side during spray work, may need replacement sooner than the other. Buying a pair for a one-sided replacement wastes a cartridge and adds unnecessary cost. The 7307 single unit eliminates that waste. For operations that track individual cartridge change records per OSHA 1910.134 requirements — particularly where supervisors document each port's service life separately — the single unit also makes record-keeping cleaner.

Acid Gas Breadth Beyond Basic OV Cartridges

A basic 7107 OV-only cartridge provides no acid gas protection. The 7307 adds HCl, Cl2, HF, SO2, and H2S coverage with no change to the cartridge footprint or installation process. For industrial environments where acid gas exposure is present or suspected, the step up from OV-only to OV+AG costs a small premium but eliminates a significant compliance gap. Battery rooms (H2S and H2SO4 offgassing), water treatment facilities (Cl2), semiconductor fabs (HF), and pulp mills (SO2 and Cl2) all benefit from the combined class. See our acid gas cartridge guide for a full breakdown of hazard classes by industry.

Where the Moldex 7307 Falls Short

Higher Per-Unit Cost Than the 7300 Pair

At the listed price per single unit, two 7307 cartridges total the listed price. The 7300 pair is approximately the listed price — about the listed price more for two cartridges purchased together. That is a ~6% premium for the pair format, but the pair is still cheaper per individual cartridge (the listed price is only the listed price less per single, but the total spend for equipping both ports is the listed price singles vs the listed price pair). If you need both cartridges, the pair saves money. The 7307 single only wins economically when you genuinely need one cartridge, not two.

No End-of-Service-Life Indicator

The 7307 has no ESLI — no color change, no electronic sensor, no visual cue that the cartridge is saturated. OSHA 29 CFR 1910.134(d)(3)(iii)(B) requires a written change schedule when no ESLI is available. That schedule must be based on objective information: contaminant concentration, work duration, temperature, humidity, breathing rate, and the cartridge's established service life data. For small employers or occasional users who lack industrial hygiene support, building and maintaining that schedule can be a compliance burden. See our cartridge selection guide for change schedule methods.

No Particulate Protection — Upgrade to the 7367 Combo

The 7307 is a gas-phase-only cartridge. It provides zero protection against dust, mist, aerosols, metal fumes, or biological particles. Environments that combine solvent vapors with welding fumes, spray paint overspray, silica dust, or grinding debris require a combination cartridge. The Moldex 7367 adds P100 particulate filtration to the same OV+AG base, maintaining NIOSH approval for all three protection classes in one unit. If your hazard assessment includes both gas and particulate hazards, the 7367 is the correct choice — not layering a 7307 with a separate P100 pre-filter (which the 7307 bayonet mount does not support independently).

Moldex-Only Compatibility

The bayonet mount is proprietary to Moldex. It does not fit 3M, Honeywell North, MSA, Sperian, or any other brand's respirator. Facilities that run a mixed fleet of respirator brands must stock brand-specific cartridges. The 3M 6003 is the equivalent for 3M 6000/7000/FF-400 series masks. If your program is not standardized on Moldex, verify compatibility before ordering.

Comparison: 7307 Single vs. 7300 Pair vs. 3M 6003

All three cartridges carry NIOSH OV+AG approval. The differences are format, price, and platform.

Key takeaway: the 7307 and 7300 are chemically identical — same Moldex OV+AG media, same bayonet mount, same NIOSH approval. The 7300 pair is the better value when you need both cartridges at once. The 7307 single wins only for one-side replacement or low-volume scenarios. The 3M 6003 is the cross-brand alternative for 3M respirator users — not interchangeable with Moldex hardware.

Single Cartridge Comparison: 7107 vs. 7307 vs. 7607

Moldex's single-cartridge lineup covers three distinct protection classes. Choosing correctly depends on your specific hazard assessment.

Decision rules:

• If you face only organic vapors with no acid gas hazard, the 7107 OV single is sufficient and less expensive.
• If you face organic vapors and any of HCl, Cl2, HF, SO2, or H2S, the 7307 is the correct single-unit choice.
• If your hazard assessment is uncertain, your exposure profile is variable, or your compliance program requires an ESLI, the 7607 Smart adds the visual end-of-service indicator — worth the premium for programs that cannot support a rigorous written change schedule.
• If particulates are also present, none of the three above are adequate — move to the 7367 OV+AG+P100 combo.

Compatible Moldex Respirators

The Moldex 7307 uses the standard Moldex bayonet mount and fits the following platforms. Browse the full Moldex half-mask collection and Moldex full-face respirator collection for sizing options.

The assigned protection factor (APF) determines the maximum use concentration relative to the OSHA permissible exposure limit (PEL). Half-mask respirators with an APF of 10 are suitable for concentrations up to 10 times the PEL. Full-face respirators with an APF of 50 extend that to 50 times the PEL — relevant in higher-concentration environments such as acid cleaning baths or concentrated solvent exposure. See the full Moldex cartridge and filter catalog for the complete compatibility matrix.

OV+AG vs. OV-Only: When Does the Acid Gas Class Matter?

Organic vapor cartridges protect against compounds with a boiling point above -20°C that have an 8-hour TWA NIOSH REL or OSHA PEL less than 1000 ppm. That covers most industrial solvents: toluene, xylene, acetone, MEK, hexane, ethanol, and hundreds of others. OV cartridges do not protect against acid gases — a separate activated carbon bed impregnated with a base (typically potassium hydroxide or sodium carbonate) is required for HCl, Cl2, HF, SO2, and H2S removal.

The 7307 combines both beds in one cartridge housing. This matters in environments where both hazard classes coexist:

• Battery rooms and charging stations: sulfuric acid mist (H2SO4) and hydrogen sulfide (H2S) offgassing alongside solvent-based cleaning agents
• Semiconductor fabrication: hydrofluoric acid (HF) etch processes adjacent to solvent-based photoresist operations
• Water and wastewater treatment: chlorine gas (Cl2) used in disinfection alongside solvent maintenance work
• Pulp and paper mills: sulfur dioxide (SO2) and hydrogen sulfide (H2S) from kraft process alongside solvent-based coating operations
• Spray painting and coating lines: where HCl may be present from cleaning or surface preparation prior to painting

For pure solvent work with no acid gas present, the 7100 or 7107 OV-only cartridge is sufficient and less expensive. Refer to your cartridge color code reference and OSHA's assigned protection factor tables when building your respiratory protection program. For acid gas cartridge selection across brands and classes, our acid gas respirator cartridge guide covers selection criteria in detail. For solvent and painting applications, see our best cartridge for solvents guide. Browse the full respirator filters and cartridges collection for all available options.

Common questions

What does the Moldex 7307 protect against?

The Moldex 7307 is NIOSH-approved for organic vapors and acid gases under 42 CFR Part 84. Acid gas coverage includes hydrogen chloride (HCl), chlorine (Cl2), hydrogen fluoride (HF), sulfur dioxide (SO2), and hydrogen sulfide (H2S). It does not protect against particulates, ammonia, or oxygen-deficient atmospheres.

How many Moldex 7307 cartridges do I need for my respirator?

Two. Every Moldex half-mask and full-face respirator has two cartridge ports — one on each side. The 7307 is sold as a single unit, so you must purchase two units to equip one complete respirator. If you need both cartridges at once, the 7300 pair provides both in one package at a lower total cost.

What is the difference between the Moldex 7307 and the Moldex 7300?

The 7307 is a single cartridge; the 7300 is a pair of identical cartridges in one package. The protection class, media chemistry, NIOSH approval, and bayonet mount are identical. The 7300 pair costs approximately the listed price for two cartridges. Buying two 7307 singles costs approximately the listed price — slightly less total, but the pair is generally the better buy for regular two-sided replacement due to convenience and potential bulk pricing. The 7307 single is the right choice when replacing only one cartridge.

Is the Moldex 7307 NIOSH approved?

Yes. The Moldex 7307 carries NIOSH approval under 42 CFR Part 84 for Organic Vapor (OV) and Acid Gas (AG) combined classes. This is the applicable federal standard for respiratory protection cartridges used in OSHA-regulated workplaces under 29 CFR 1910.134.

What respirators are compatible with the Moldex 7307 cartridge?

The 7307 is compatible with all Moldex respirators that use the standard bayonet mount: the 7000 series half-masks (7001, 7002, 7003), the Moldex 7800 series half-mask, and the 9000 series full-face respirators (9001, 9002, 9003). It is not compatible with any other brand's respirator.

Does the Moldex 7307 have an ESLI (end-of-service-life indicator)?

No. The 7307 has no ESLI. OSHA 29 CFR 1910.134(d)(3)(iii)(B) requires a written change schedule when no ESLI is available. The schedule must be based on objective information including contaminant identity, concentration, work duration, temperature, humidity, and cartridge service life data. Employers cannot rely on smell or taste as a change indicator under OSHA requirements.

Does the Moldex 7307 protect against dust and particulates?

No. The 7307 is a gas-phase cartridge only. It provides no protection against dust, mist, fumes, aerosols, or any solid or liquid particulate hazards. For environments with both gas and particulate hazards, use the Moldex 7367, which combines OV+AG protection with P100 particulate filtration in one cartridge.

How often should I replace the Moldex 7307 cartridge?

Replacement frequency depends on contaminant concentration, exposure duration, temperature, and relative humidity — not a fixed calendar interval. Because the 7307 has no ESLI, you must follow a written change schedule per OSHA 29 CFR 1910.134(d)(3)(iii)(B). Moldex publishes service life data for common contaminants; your employer's industrial hygienist or safety officer should establish the schedule based on your specific exposure conditions. When in doubt, change more frequently — cartridges are far less expensive than overexposure incidents.

Can I use the Moldex 7307 with a 3M or Honeywell respirator?

No. The 7307 uses the Moldex proprietary bayonet mount. It is not physically compatible with 3M, Honeywell North, MSA, or any other manufacturer's respirator. For 3M respirators requiring OV+AG protection, use the 3M 6003.

What is the price of the Moldex 7307 single cartridge?

The Moldex 7307 is priced at the listed price per single cartridge at WC Safety. Because a complete respirator requires two cartridges, equipping both ports with 7307 singles costs approximately the listed price. The 7300 pair costs approximately the listed price for two cartridges — marginally more, but convenient if you need both at once.

Is the Moldex 7307 suitable for spray painting?

Yes, for spray painting environments where both organic solvent vapors and acid gases are present. If your spray painting work involves only solvent vapors with no acid gas hazard, the less expensive 7107 OV-only cartridge is sufficient. If your spray environment also involves particulate overspray (atomized paint droplets, pigment dust), the 7307 alone is inadequate — use the 7367 OV+AG+P100 combo instead.

What acid gases does the Moldex 7307 protect against?

The 7307 provides NIOSH-approved protection against hydrogen chloride (HCl), chlorine (Cl2), hydrogen fluoride (HF), sulfur dioxide (SO2), and hydrogen sulfide (H2S). It does not protect against ammonia, methylamine, formaldehyde above the OV class threshold, or other specific gases not within the NIOSH OV or AG classification. Verify the specific contaminants in your workplace against the cartridge's NIOSH approval before use.

Should I buy the Moldex 7307 single or the 7300 pair for everyday work?

For everyday production work where both cartridges are replaced simultaneously on a regular schedule, the 7300 pair is the better choice. The pair is more economical per cartridge at scale and eliminates the need to buy two separate units. The 7307 single is the right buy when replacing only one cartridge, for low-volume or occasional use, or when stocking small quantities.

What is the difference between the Moldex 7307 and the 7367?

The 7307 provides OV+AG (gas phase) protection only. The 7367 adds P100 particulate filtration to the same OV+AG base, providing NIOSH approval for three protection classes in one cartridge — OV, AG, and P100. If your environment contains both gas-phase hazards and particulate hazards (dust, fumes, mist, aerosols), the 7367 is the correct choice. The 7307 is appropriate where only gas-phase hazards are present.

What does the Moldex 7307 cartridge look like, and how do I identify it?

The Moldex 7307 has a yellow color-coded body per the NIOSH-required scheme (42 CFR 84.193 / ANSI K13.1) for organic vapor + acid gas combination cartridges (black = OV alone, white = acid gas alone, yellow = the OV/AG combination). The Moldex model number and NIOSH approval number are printed on the cartridge housing. Always verify the model number before installation, particularly when multiple cartridge types are stored together. A cartridge color code reference can help identify protection classes across brands.

Sources. Requirements referenced here come from OSHA 29 CFR 1910 and the NIOSH recommendations. Where a consensus standard governs, the ANSI document is named in the text.

Related reference

Related on this site: 3m secure click d8001 organic vapor respirator cartridge, 3m secure click d8003 organic vapor and acid gas cartridge, 3m secure click d80921 organic vapor p100 combination cartridge 1 pair, 3m versaflo tr-6510n organic vapor/he cartridge 5-pack review — honest, how to choose a respirator cartridge: complete selection guide, and organic vapor cartridge vs acid gas cartridge.

Why trust WC Safety

WC Safety is an independent, affiliate-supported review site. It is not a retailer: it holds no inventory, takes no orders, and earns only from qualifying purchases through clearly marked links — which never changes what a product is rated to do. Standards language is taken from the regulation text directly, and ratings are reported as the manufacturer publishes them. We run no laboratory and perform no testing of our own. Where published sources disagree, we say so and plan on the conservative figure rather than the flattering one.

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.