Moldex 7300 Organic Vapor Acid Cartridge

Moldex 7300 Overview

The Moldex 7300 is a NIOSH-approved organic vapor plus acid gas cartridge that mounts via bayonet twist-lock on Moldex 7000, 7800, and 9000 series respirators. Sold as a pair (2 cartridges), the 7300 combines an activated-carbon organic vapor bed with an acid gas sorbent layer in a single cartridge body — delivering dual-class protection without stacking separate cartridges. At $18.73 per pair, it is the most affordable OV/AG option in the Moldex cartridge lineup for workers who face both hazard classes daily.

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Where the Moldex 7300 Fits in Respirator Selection

Cartridge selection starts with hazard identification. The 7300 occupies the dual-class OV/AG slot — it is the correct choice when air monitoring or SDS review confirms both organic vapors (solvents, petroleum distillates, alcohols, aromatic hydrocarbons) and acid gases (hydrogen chloride, chlorine, sulfur dioxide, hydrogen fluoride) are present simultaneously. Single-class cartridges like the Moldex 7100 OV pair or Moldex 7200 acid gas pair leave one hazard class completely unprotected in mixed environments.

Understanding filter class designations is foundational to correct cartridge selection. Our guide to nuisance relief vs. rated respirator protection explains the regulatory threshold where a change-schedule cartridge like the 7300 is legally required. For environments that also involve particulate hazards — dust, fume, mist — review our P95 vs R95 vs P100 filter class guide to determine whether the 7300 alone is sufficient or whether you need the 7367 combo cartridge. If you are evaluating end-of-service-life indicators across the Moldex line, the ESLI guide clarifies which Moldex cartridges carry active-carbon saturation indicators and which — including the 7300 — require a written change schedule instead.

When selecting between competing brands, our guide to 3M respirator cartridges and the 3M vs. Honeywell North cartridge comparison place the Moldex family in context for procurement teams evaluating multiple vendors.

Who Should Buy the Moldex 7300?

What Does the Moldex 7300 Protect Against?

What the Moldex 7300 Does NOT Protect Against

• Ammonia and methylamine — requires the Moldex 7400 ammonia/methylamine cartridge or the Moldex 7467 AM/P100 combo.
• Particulates (dust, smoke, weld fume, mist, asbestos, lead) — no P-rated filter layer is present. Use the Moldex 7367 OV/AG/P100 combo or add a Moldex 7740 P100 filter where the platform supports stacking.
• Carbon monoxide, carbon dioxide, methane, and other non-NIOSH-listed gases — these pass through the activated carbon bed without adsorption.
• Low-boiling-point organic compounds (<65°C boiling point) — breakthrough occurs rapidly and may not be detectable by odor in time.
• Nuisance-level odors where a rated cartridge is not required — the 7300 is a full regulatory cartridge, not a nuisance-relief filter.

Best Applications for the Moldex 7300

Battery Room Maintenance

Charging lead-acid batteries releases hydrogen sulfide and sulfuric acid mist (acid gas hazards) alongside any solvent vapors from battery service compounds. The 7300's combined OV/AG coverage addresses both hazard classes in a single cartridge change, making it the standard choice for battery room technicians on Moldex half-mask respirators. Pair with forced ventilation and a written change schedule based on measured H₂S and H₂SO₄ concentrations.

Laboratory Chemical Handling

Labs that work with both organic solvents (acetone, methanol, toluene, xylene) and inorganic acids (HCl, HF, H₂SO₄) in the same work session benefit from the 7300's dual-class protection without having to swap cartridges mid-task. The Moldex 9000 full-face platform combined with 7300 cartridges also provides eye and face protection against chemical splatter, which is particularly relevant in bench chemistry environments.

Industrial Cleaning Operations

Industrial cleaning contracts frequently involve acid descalers or muriatic acid followed by solvent-based degreasers in the same shift. Using a single-class cartridge for each task creates a window of unprotected exposure when switching chemicals. The 7300 eliminates that gap with continuous dual-class coverage throughout the work cycle. Review our collection of Moldex cartridges and filters to confirm the right cartridge for each specific chemical inventory your crew uses.

Spray Painting and Coatings in Confined Spaces

Many industrial coatings and primers release both organic vapor solvents and acid-catalyzed isocyanate byproducts or acid hardeners. The 7300 is appropriate for OV/AG environments where particulate loading is low; if the coating also produces significant aerosol mist or spray particles, specify the 7367 OV/AG/P100 combo rather than the 7300 alone. Proper distinction between nuisance and rated protection is critical in confined-space painting scenarios.

Chemical Manufacturing and Process Operations

Batch chemical processing — particularly in pharmaceutical, specialty chemical, and fine chemical plants — regularly exposes workers to both organic intermediates and acidic reagents during the same unit operation. The 7300 provides a reliable, cost-effective dual-class cartridge for routine process monitoring, sampling, and maintenance tasks where full-face supplied-air protection is not warranted. For higher-concentration or unknown-mixture environments, consult an industrial hygienist and consider whether the 7600 multi-gas Smart cartridge with its ESLI is more appropriate.

Pros and Cons

Compatible Moldex Respirators

The Moldex 7300 does NOT fit any non-Moldex respirator. Cartridge thread and bayonet geometries are brand-specific and are not interchangeable across manufacturers. Installing a Moldex cartridge on a non-Moldex facepiece will result in an undetected air leak and no chemical protection.

Moldex 7300 vs Other Moldex Cartridges

Moldex 7300 vs Moldex 7307: Pair vs. Single

Moldex 7300 Quick Answers

What respirators does the Moldex 7300 fit?

The Moldex 7300 fits the Moldex 7000 series half-mask, 7800 series half-mask, and 9000 series full-face respirator. It uses Moldex's proprietary bayonet twist-lock interface and is not compatible with any non-Moldex respirator facepiece.

Does the Moldex 7300 protect against acid gases?

Yes. The 7300 is a combined organic vapor plus acid gas cartridge with NIOSH approval for both protection classes. It protects against hydrogen chloride, chlorine, sulfur dioxide, hydrogen fluoride, and other NIOSH-listed acid gases simultaneously with organic vapor protection.

How many cartridges come in a Moldex 7300 package?

Two cartridges per package. The 7300 is sold as a pair, providing both cartridges needed for a dual-port half-mask or full-face respirator. For a single replacement cartridge, order the Moldex 7307 instead.

Does the Moldex 7300 have an end-of-service-life indicator (ESLI)?

No. The 7300 does not include an ESLI. OSHA 29 CFR 1910.134(d)(3)(iii)(B) requires employers to establish a written cartridge change schedule based on objective information such as air monitoring data and manufacturer breakthrough specifications whenever ESLI is absent.

What is the difference between the Moldex 7300 and the 7367?

The 7367 adds a P100 particulate filter layer to the same OV/AG protection. If your environment includes dust, mist, smoke, or weld fume alongside organic vapors and acid gases, the 7367 is the correct choice. If the hazard is purely gaseous with no significant particulate loading, the 7300 pair is sufficient and slightly more economical per pair unit.

Can the Moldex 7300 be used with a full-face respirator?

Yes. The 7300 fits the Moldex 9000 series full-face respirator. When mounted on a full-face respirator, the assigned protection factor (APF) increases from 10 (half-mask) to 50, allowing use in environments up to 50 times the PEL. The full-face platform also provides simultaneous eye and face chemical splash protection.

Is the Moldex 7300 NIOSH approved?

Yes. The Moldex 7300 carries NIOSH approval for organic vapor and acid gas protection. NIOSH approval is the minimum regulatory standard required for cartridges used in OSHA-regulated respiratory protection programs under 29 CFR 1910.134.

Moldex 7300 Specifications

Helpful Buying Guides

• Respirator Cartridge ESLI Guide: When You Need an End-of-Service-Life Indicator
• Nuisance Relief vs. Rated Respirator Protection: Know the Regulatory Threshold
• P95 vs R95 vs P100: Respirator Filter Class Explained
• Best 3M Respirator Cartridges: Buyer's Guide
• 3M vs Honeywell North Respirator Cartridges: Full Comparison
• Best Respirator Cartridge for Mercury Vapor

Moldex 7300 Frequently Asked Questions

Is the Moldex 7300 sold as a pair or as a single cartridge?

The 7300 is sold as a pair — two cartridges per package at $18.73. This provides both cartridges needed for a standard dual-port half-mask or full-face respirator. If you need a single replacement cartridge, order the Moldex 7307 at $8.80.

Does the Moldex 7300 protect against both organic vapor and acid gas in one cartridge?

Yes. The 7300 combines an activated-carbon organic vapor layer with an acid gas sorbent in a single cartridge body. This eliminates the need to stack or swap cartridges when both OV and AG hazards are present in the same work environment.

Which Moldex respirator platforms accept the 7300 cartridge?

The 7300 is compatible with the Moldex 7000 series half-mask, the Moldex 7800 series half-mask, and the Moldex 9000 series full-face respirator. It is not compatible with any respirator from another manufacturer.

When do I need to replace the Moldex 7300 cartridge?

Because the 7300 has no end-of-service-life indicator (ESLI), OSHA 29 CFR 1910.134 requires your employer to maintain a written cartridge change schedule. At a minimum, replace cartridges when any chemical odor or taste is detected through the respirator, after any exposure to concentrations above the cartridge's rated capacity, or as specified in your written respiratory protection program.

Can I use the Moldex 7300 in a battery room?

Yes — battery room maintenance is one of the primary applications. Lead-acid battery charging releases sulfuric acid mist (acid gas) and hydrogen sulfide (acid gas), alongside any solvent vapors from service compounds. The 7300's dual OV/AG coverage addresses both hazard classes. Verify actual air concentrations are below IDLH and within the APF of your selected respirator platform before relying on the 7300 alone.

What is the difference between the Moldex 7300 and the 7200?

The Moldex 7200 provides acid gas protection only at $36.23 per pair — it contains no activated-carbon organic vapor layer. The 7300 adds organic vapor protection to the same acid gas coverage at the lower price of $18.73 per pair. For mixed OV/AG environments, the 7300 is both more protective and more cost-effective than the 7200.

Does the Moldex 7300 filter dust or particulates?

No. The 7300 does not include a particulate filter and carries no NIOSH P-rating. For environments with both chemical vapor and particulate hazards, specify the Moldex 7367 OV/AG/P100 combo cartridge instead.

Can the Moldex 7300 be used for spray painting?

The 7300 is appropriate for solvent-based spray painting where the hazard is purely gaseous (organic vapor solvent + any acid-catalyst off-gassing) with no significant aerosol particulate mist. If the application generates paint mist, aerosol particles, or isocyanate particulates, use the Moldex 7367 with P100 particulate protection instead.

How does the 7300 compare to the Moldex 7600 multi-gas cartridge?

The Moldex 7600 covers a broader multi-gas profile (OV, AG, ammonia, and additional hazards) and includes a Smart ESLI for visual breakthrough indication. The 7300 covers OV and AG only but costs slightly less per pair. Choose the 7600 when your hazard profile extends beyond OV and AG, or when your respiratory protection program requires ESLI-equipped cartridges.

Is the Moldex 7300 approved for hydrogen sulfide (H₂S) exposure?

Low-concentration H₂S falls within the acid gas class under certain NIOSH approvals. Verify the specific H₂S concentration against Moldex's current NIOSH approval certificate and your industrial hygienist's assessment before relying on the 7300 for H₂S protection. High concentrations of H₂S are immediately dangerous to life and health and require supplied-air or SCBA equipment.

Does the Moldex 7300 work with the Moldex 9000 full-face respirator?

Yes. The 7300 bayonet mounts directly to the Moldex 9000 full-face respirator, raising the assigned protection factor from 10 (half-mask) to 50. This combination also provides complete eye and face protection against chemical splash — important in acid handling and laboratory environments.

Where can I buy the Moldex 7300 online?

The Moldex 7300 is available on Amazon with Prime shipping, and through WC Safety's full Moldex cartridge and filter collection for bulk and business orders.