Moldex 7307 Organic Vapor Acid Gas Respirator Cartridge

Moldex 7307 Overview

The Moldex 7307 is a single organic vapor and acid gas replacement cartridge that provides NIOSH-approved dual-class chemical protection on Moldex 7000, 7800, and 9000 series respirators. Sold one per bag at $8.80, it lets workers replace a single spent cartridge rather than buying a full pair — a practical advantage in applications where one side sees heavier exposure or a cartridge is damaged in the field.

Compared to the Moldex 7300 pair ($18.73), the 7307 costs fractionally more per unit but gives you the flexibility to buy exactly what you need. If your job also involves airborne particulates — dust, mist, or fumes — consider pairing a P100 filter or upgrading to the Moldex 7367 combination cartridge, which adds a P100 filter layer to the same OV+AG protection.

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Where the Moldex 7307 Fits in Respirator Selection

Cartridge selection starts with your hazard inventory, not your respirator model. The Moldex 7307 covers two distinct NIOSH-designated chemical classes in a single cartridge body: organic vapors (OV) and acid gases (AG). That dual coverage makes it the correct choice for jobs where both hazard types are present at the same time — chlorinated solvent degreasers that also off-gas hydrogen chloride, spray application of acid-containing primers, or fumigation work involving both aromatic vapors and acidic byproducts.

Understanding the difference between nuisance relief and rated protection is essential before selecting any cartridge. If you are unsure which class applies to your hazard, our nuisance relief vs. rated respirator protection guide explains the threshold difference. For a side-by-side of all Moldex chemical cartridge options, the Moldex cartridges and filters collection is the starting point. Workers choosing between Moldex and 3M cartridges for similar hazards should also review our best 3M respirator cartridges guide and the 3M vs. Honeywell North cartridge comparison to confirm brand fit before purchasing.

If particulates are also present in your environment, review the P95 vs. R95 vs. P100 filter class guide — the 7307 alone provides no particulate protection, and you will need either a stacked P100 filter or the 7367 combo cartridge.

Who Should Buy the Moldex 7307?

What Does the Moldex 7307 Protect Against?

What the Moldex 7307 Does NOT Protect Against

• Particulates (dust, mist, metal fumes, mold spores, fibers) — this cartridge contains no particulate filter media. Add Moldex 7740 P100 filters or switch to the 7367 combination cartridge.
• Ammonia and methylamine — not adsorbed by OV+AG sorbent media. Use Moldex 7407 or the 7400 pair.
• Multi-gas chemical classes beyond OV+AG scope — the Moldex 7600 multi-gas cartridge pair covers a broader chemical spectrum.
• Carbon monoxide, nitrogen oxides, or other non-adsorbed gases — not rated for these hazards under any conditions.
• Oxygen-deficient atmospheres, IDLH concentrations, or immediately dangerous conditions — see safety callout below.

Best Applications for the Moldex 7307

Spray Painting and Industrial Coating

Solvent-based paints, primers, and clear coats release both organic vapor solvents (toluene, xylene, naphtha) and, in acid-catalyzed or chlorinated formulations, acid gas byproducts. The 7307 addresses both hazard classes simultaneously, making it the correct single-cartridge solution for painters who do not want to manage separate OV and AG cartridges. Browse the full Moldex half-mask respirator collection if you also need a replacement facepiece.

Chemical Mixing and Formulation

Laboratory and production environments where operators blend solvents with acid catalysts — epoxy hardeners, adhesive formulations, cleaning concentrates — routinely generate both OV and AG hazards in the same breathing zone. The 7307 covers both without requiring a multi-cartridge assembly.

Pest Control and Fumigation

Certain fumigants and rodenticides release organic vapor components alongside acidic off-gassing products. Pest control technicians who carry one or two spare cartridges per service van benefit from the single-unit format of the 7307, which avoids carrying a full pair when only one-side replacement is needed mid-route.

Water Treatment and Pool Chemical Handling

Chlorine gas (an acid gas) and organic solvent-based cleaners are both common hazards in water treatment facilities and aquatic center maintenance. The 7307's dual OV+AG sorbent bed is well matched to this combined exposure profile. For workers evaluating the broader best cartridge for solvents across brands, this guide provides a useful cross-brand comparison to confirm the Moldex platform is the right fit.

Single-Cartridge Replacement Purchasing

Any existing Moldex respirator user who loses one cartridge, has one fail inspection, or wants to rotate one side before the other benefits from the 7307's single-unit availability. This is the most common purchase scenario for this SKU versus the 7300 pair.

Moldex 7307 Pros and Cons

Compatible Moldex Respirators

The Moldex 7307 uses Moldex's proprietary bayonet-mount system. It is compatible with all current Moldex half-mask and full-face respirator series listed below.

The Moldex 7307 does NOT fit any non-Moldex respirator. Moldex cartridges use a proprietary bayonet connection that is not compatible with 3M, Honeywell North, MSA, Draeger, or any other manufacturer's facepiece. Attempting to force-fit incompatible cartridges voids NIOSH certification and eliminates all protection.

Moldex 7307 vs Other Moldex Cartridges

Moldex 7307 vs Moldex 7367 — When to Add the P100 Layer

Moldex 7307 Quick Answers

What respirators does the Moldex 7307 fit?

The Moldex 7307 fits the Moldex 7000, 7800, and 9000 series respirators using Moldex's standard bayonet-mount connection. It does not fit any non-Moldex respirator brand.

Is the Moldex 7307 sold as a single cartridge or a pair?

The Moldex 7307 is sold as a single cartridge (1 per bag) at $8.80. For a full pair, the equivalent product is the Moldex 7300 OV+AG pair at $18.73.

Does the Moldex 7307 have an ESLI?

No. The Moldex 7307 does not have an End-of-Service-Life Indicator. Change-out must follow an employer-established schedule based on OSHA guidelines for the specific contaminant, concentration, and usage duration.

What is the difference between the Moldex 7307 and 7367?

Both cartridges provide identical OV+AG protection. The Moldex 7367 adds an integrated P100 particulate filter layer; the 7307 does not. Choose the 7367 when airborne particulates are also present.

Can I use the Moldex 7307 for hydrogen sulfide (H₂S)?

The Moldex 7307 is rated for acid gases, which includes hydrogen sulfide at low concentrations within permissible exposure limits. It must never be used at or above H₂S IDLH concentrations (100 ppm). Confirm your specific H₂S exposure levels with an industrial hygienist before relying on a cartridge-type respirator.

Is the Moldex 7307 NIOSH approved?

Yes. The Moldex 7307 carries NIOSH approval as a combined organic vapor and acid gas cartridge, meeting NIOSH 42 CFR Part 84 requirements for chemical cartridge respirator components.

Can I stack a P100 filter on top of the Moldex 7307?

Yes. The Moldex 7307 can be used with Moldex 7740 P100 particulate filters stacked on the cartridge for combined chemical and particulate protection. Alternatively, the 7367 combination cartridge integrates both layers in a single assembly.

Moldex 7307 Specifications

Helpful Buying Guides

• P95 vs. R95 vs. P100 Filter Class Guide — understand particulate filter ratings before adding a P100 layer to your Moldex 7307
• Respirator Cartridge ESLI Guide — how End-of-Service-Life Indicators work and how to build a change-out schedule when your cartridge lacks one
• Nuisance Relief vs. Rated Respirator Protection — what the protection threshold difference means for your cartridge selection
• Best 3M Respirator Cartridges — a cross-brand comparison if you are evaluating Moldex against 3M OV+AG options
• 3M vs. Honeywell North Cartridge Comparison — brand-level comparison for workers not yet committed to the Moldex platform
• Best Honeywell North Cartridge for Solvents — benchmark if your solvent hazard profile overlaps with the Moldex 7307's OV coverage

Moldex 7307 Frequently Asked Questions

Is the Moldex 7307 the same as the 7300, just sold as a single unit?

Yes — the 7307 and 7300 use identical cartridge media and provide the same OV+AG protection. The only difference is pack quantity: the 7307 is sold as one cartridge per bag at $8.80, while the 7300 pair sells for $18.73 for two cartridges. If you are replacing both cartridges simultaneously, the pair is a fractionally better per-unit cost.

How do I know when to change the Moldex 7307?

The Moldex 7307 has no ESLI. Change-out must be based on your employer's written change-out schedule, following OSHA 1910.134 Appendix B guidelines. Factors include contaminant identity, concentration, humidity, temperature, and duration of use. Never continue using a cartridge if you detect contaminant odor or taste through the facepiece.

Can the Moldex 7307 be used for chlorine gas?

Yes. Chlorine (Cl₂) is classified as an acid gas, and the Moldex 7307 provides acid gas protection against chlorine within permissible exposure limits and below IDLH concentration (10 ppm for chlorine). Confirm your specific chlorine exposure level before selecting this cartridge.

Does the Moldex 7307 protect against paint fumes?

The Moldex 7307 provides organic vapor protection against solvent-based paint fumes (toluene, xylene, naphtha, MEK). It does not filter paint particulates, spray mist, or aerosols. For spray painting applications where mist is generated, the 7367 OV+AG+P100 combo cartridge is the more complete solution.

Will the Moldex 7307 work on my Moldex 7800 series half-mask?

Yes. The Moldex 7307 is compatible with the 7800 series half-mask, which uses the same proprietary bayonet cartridge mount as the 7000 and 9000 series respirators.

What is the shelf life of an unopened Moldex 7307 cartridge?

Moldex chemical cartridges, when stored unopened in original sealed packaging at recommended conditions (cool, dry environment away from contaminants), have a five-year shelf life from the date of manufacture. Once opened and exposed to air, cartridge service life depends on your specific use conditions. Consult Moldex's published guidance and your industrial hygienist for change-out scheduling.

Can I use the Moldex 7307 for hydrogen fluoride (HF) exposure?

Hydrogen fluoride is classified as an acid gas, and the 7307's acid gas sorbent bed covers HF within permissible exposure limits. HF is an extremely hazardous substance — always confirm your exposure levels with a certified industrial hygienist and ensure your written respiratory protection program specifically addresses HF before relying on a cartridge-type respirator for this hazard.

How does the Moldex 7307 attach to the respirator facepiece?

The Moldex 7307 attaches via Moldex's tool-free bayonet twist-lock mechanism. Align the cartridge, push it onto the facepiece port, and rotate to lock. No tools are required. Removal is the reverse — twist and pull. This system is exclusive to Moldex respirators.

Is the Moldex 7307 suitable for mold remediation work?

Mold remediation typically involves airborne mold spores, which are biological particulates — not chemical vapors. The 7307 provides no particulate filtration and is not the correct choice as a primary mold respirator. For mold work, a P100 particulate filter is the essential protection layer. See our best cartridge for mold remediation guide for a full breakdown. If your mold remediation also involves chemical cleaning agents with OV+AG hazards, the 7367 combination cartridge covers both.

Can I buy Moldex 7307 cartridges in bulk?

The 7307 is listed as a single-unit purchase at $8.80 per cartridge. For bulk procurement, check the Moldex cartridges collection for current bulk pricing or contact WC Safety directly for B2B volume orders. If your program replaces cartridges in pairs, the Moldex 7300 pair is typically the more cost-efficient bulk-purchase format.

Does the Moldex 7307 have an expiration date once opened?

Yes. Once the original packaging is opened, the activated carbon sorbent in the cartridge begins interacting with ambient air. Opened but unused cartridges should be stored in a sealed container or bag and replaced per your employer's change-out schedule. Most industrial hygiene programs treat opened cartridges that have not been used within a shift as candidates for replacement rather than reuse.

What is the difference between the Moldex 7307 and the Moldex 7607 multi-gas cartridge?

The Moldex 7607 multi-gas Smart single cartridge ($6.65) covers a broader chemical spectrum than the 7307 and includes a Smart ESLI that changes color as the sorbent bed saturates. The 7307 covers OV+AG only with no ESLI. Choose the 7607 when your hazard involves multiple chemical classes or when you want an ESLI-based visual change-out indicator. Choose the 7307 when your hazard is confirmed OV+AG only and your program uses schedule-based change-out. See the ESLI guide for more on how Smart ESLIs work.