Moldex 7307 Single OV+AG Cartridge Review — Single vs Pair, Who Should Buy Which
Is the Moldex 7307 single OV+AG cartridge worth it — or should you buy the 7300 pair?
Short answer: The 7307 single cartridge delivers identical NIOSH-approved OV+AG protection to the 7300 pair. At $8.80 per unit, buying two singles costs ~$17.60 versus roughly $18.73 for the 7300 pair — the pair wins on price. The 7307 exists for single-side replacement, occasional use, or low-volume work where buying a two-pack creates waste. Choose accordingly.
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.
Verdict: The Moldex 7307 is a solid, NIOSH-approved OV+AG cartridge in a single-unit format that fills a real gap in the market. The dual organic vapor and acid gas protection class is rare at this price point, the Moldex bayonet system is fast and tool-free, and the cartridge slots into one of the most comfortable half-mask platforms in the industry. The single-unit format earns its place for replacement and low-volume use. It loses points relative to the 7300 pair only on per-unit cost economics and the absence of an ESLI, which requires users to maintain a written change schedule per OSHA 29 CFR 1910.134.
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Pros and Cons
Pros
- NIOSH-approved OV+AG under 42 CFR Part 84 — same class as the 7300 pair
- Covers six acid gases: HCl, Cl2, HF, SO2, H2S, plus organic vapors
- Bayonet mount installs and removes without tools in seconds
- Compatible across all current Moldex platforms (7000, 7800, 9000 series)
- Single-unit format ideal for one-side replacement or low-volume use
- Low-profile, color-coded olive/yellow body — easy to identify at a glance
- No wasted cartridge if only one port needs replacement
Cons
- Costs more per cartridge than buying the 7300 pair ($8.80 vs ~$9.37/unit in the pair)
- Two units still required for a complete respirator — total spend exceeds the pair price
- No ESLI — written change schedule mandatory per OSHA 29 CFR 1910.134(d)(3)(iii)(B)
- No particulate protection — gases only (upgrade to 7367 combo for dust/fume environments)
- Not compatible with 3M, Honeywell North, or MSA respirators
Who Should Buy the 7307 vs. the 7300 Pair
The cartridge chemistry is identical — the decision is entirely about format, quantity, and economics.
Buy the 7307 single if you:
- Need to replace only one cartridge (one port clogged, damaged, or saturated)
- Use your respirator occasionally — quarterly painting, annual facility work, infrequent solvent cleaning
- Are stocking a first-aid or emergency cabinet with a small quantity
- Want to evaluate the Moldex OV+AG platform before committing to bulk
- Run low-volume operations where buying a pair means discarding an unused cartridge
- Purchase as a training or fit-testing spare
Buy the 7300 pair if you:
- Replace both cartridges on a regular change schedule — the normal case for any production worker
- Want the lowest cost per cartridge (~$9.37 each vs $8.80 x2 = $17.60 vs $18.73 pair)
- Buy in volume for a crew or department
- Do daily or weekly tasks with solvent or acid gas exposure
- Prefer to minimize SKUs in your PPE inventory
- Run spray booths, chemical mixing, or acid cleaning operations full-time
Bottom line on economics: Two 7307 singles at $8.80 each totals $17.60. The 7300 pair costs approximately $18.73 — roughly $1.13 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 $8.80 per single unit, two 7307 cartridges total $17.60. The 7300 pair is approximately $18.73 — about $1.13 more for two cartridges purchased together. That is a ~6% premium for the pair format, but the pair is still cheaper per individual cartridge ($9.37 vs $8.80 is only $0.57 less per single, but the total spend for equipping both ports is $17.60 singles vs $18.73 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.
| Model | Format | Price | Cost for Both Ports | ESLI | Platform | Buy |
|---|---|---|---|---|---|---|
| Moldex 7307 | Single | $8.80 | ~$17.60 (2x) | No | Moldex 7000, 7800, 9000 | Amazon → |
| Moldex 7300 | Pair | ~$18.73/pair | ~$18.73 (pair) | No | Moldex 7000, 7800, 9000 | Amazon → |
| 3M 6003 | Pair | Varies | Pair price | No | 3M 6000, 7000, FF-400 | Amazon → |
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.
| Model | Protection | ESLI | Best For | Buy |
|---|---|---|---|---|
| Moldex 7107 | OV only | No | Solvent cleaning, painting (no acid gas present) | Amazon → |
| Moldex 7307 | OV + Acid Gas | No | Mixed OV+acid gas environments, battery rooms, fabs, pulp mills | Amazon → |
| Moldex 7607 | OV + AG + broad multi-gas (Smart) | Yes (Smart ESLI) | Unknown or variable chemical environments, compliance-intensive programs | Amazon → |
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.
Shop Moldex single cartridges on Amazon:
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.
| Respirator Series | Type | APF | Available Sizes | Buy |
|---|---|---|---|---|
| Moldex 7000 Series | Half-mask | 10 | S (7001), M (7002), L (7003) | Amazon → |
| Moldex 7800 Series | Half-mask | 10 | S, M, L | Amazon → |
| Moldex 9000 Series | Full-face | 50 | S (9001), M (9002), L (9003) | Amazon → |
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.
Shop compatible Moldex respirators:
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.
Total Cost of Ownership: 7307 Single vs. 7300 Pair
For a single wearer replacing both cartridges on a standard 8-hour workday change schedule in a moderate-exposure environment, here is a representative annual cost comparison:
| Scenario | 7307 Single (2 units) | 7300 Pair (1 pair) |
|---|---|---|
| Cost per change-out | $17.60 (2 x $8.80) | ~$18.73 |
| Annual (weekly changes, 50 weeks) | ~$880.00 | ~$936.50 |
| Annual (monthly changes, 12 months) | ~$211.20 | ~$224.76 |
| Annual (quarterly changes, 4x) | ~$70.40 | ~$74.92 |
| One-time replacement (one side only) | $8.80 | $18.73 (wastes one) |
The data shows the 7300 pair is marginally more expensive per change-out but less expensive over time when bulk pricing or multi-pack discounts apply. The 7307 single has one decisive advantage: single-side replacement. That $8.80 vs $18.73 difference on a one-sided replacement is where the 7307 earns its place in a storeroom. Pair-buying industrial programs will consistently pay less per cartridge; single-unit purchasers and maintenance departments benefit from having the 7307 available as a true replacement unit.
Final Verdict
The Moldex 7307 is a well-built, NIOSH-approved OV+AG cartridge that does exactly what it says. The dual organic vapor and acid gas protection class is substantive — covering six acid gas species plus the broad OV spectrum — and the Moldex bayonet system is among the most user-friendly cartridge connection designs on the market. The 4.2/5 rating reflects strong performance with a narrow deduction for per-unit cost economics relative to the 7300 pair and the absence of an ESLI.
For any worker who needs a single replacement cartridge, who uses their respirator infrequently, or who is equipping a small job site with minimal volume, the 7307 is the correct product. For daily production users replacing both cartridges on a schedule, the 7300 pair is the better long-term purchase. For environments that add particulate hazards, step up to the 7367 OV+AG+P100 combo.
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Frequently Asked 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 $18.73 for two cartridges. Buying two 7307 singles costs approximately $17.60 — 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 $8.80 per single cartridge at WC Safety. Because a complete respirator requires two cartridges, equipping both ports with 7307 singles costs approximately $17.60. The 7300 pair costs approximately $18.73 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 an olive/yellow color-coded body consistent with ANSI/ISEA 110 color coding for OV+AG combination cartridges (black for OV, white for acid gas — Moldex uses an olive/yellow combined body for the combination class). 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.
Why Trust This Review
WC Safety is an industrial PPE retailer specializing in respiratory protection for chemical, industrial, and construction applications. Our editorial team reviews cartridges and respirators against NIOSH approval documentation, OSHA compliance requirements (29 CFR 1910.134), and manufacturer technical data. We carry and sell the products we review. We do not accept manufacturer payments for review placement or ratings. Ratings reflect independent editorial assessment based on protection class, compatibility, ESLI status, and value relative to comparable products in the same cartridge category.
This review was written by Steven Eaton, WC Safety Editorial, and is based on product specifications, NIOSH approval records, OSHA regulatory requirements, and field use data from our customer service interactions. No manufacturer review or approval was sought or received prior to publication.
By Steven Eaton, WC Safety Editorial
Steven Eaton is the editor at WC Safety, an industrial PPE retailer. He writes on respiratory protection, OSHA compliance, and occupational safety equipment selection. WC Safety has been serving industrial customers since 2012.
Last reviewed: June 9, 2026
Editorial Methodology
Cartridge reviews at WC Safety are based on: (1) NIOSH approval documentation from the NIOSH Certified Equipment List (CEL); (2) OSHA regulatory requirements under 29 CFR 1910.134; (3) manufacturer technical data sheets and service life data; (4) compatibility testing against stated respirator platforms; (5) pricing data from WC Safety retail and Amazon marketplace; (6) comparative analysis against functionally equivalent products in the same protection class. Ratings are scored on a 5-point scale weighted for: protection class completeness (30%), compliance features including ESLI (20%), platform compatibility (15%), value relative to category (20%), and ease of use/installation (15%).
Affiliate Disclosure: WC Safety participates in the Amazon Services LLC Associates Program. Links on this page marked with Amazon buttons are affiliate links — WC Safety earns a commission on qualifying purchases at no additional cost to you. Affiliate relationships do not influence editorial ratings, product recommendations, or review conclusions. The Moldex 7307 is also sold directly by WC Safety at the prices shown. All prices shown are approximate and subject to change.