Moldex 7407 Ammonia Methylamine Respirator Cartridge Review

Moldex 7407 Single Ammonia Methylamine Cartridge Review (2026)

Ammonia and methylamine exposures sit in a narrow but critical corner of respiratory protection. These alkaline amine gases are chemically incompatible with standard activated-carbon organic vapor (OV) cartridges — the same sorbent chemistry that handles solvents, paints, and most industrial vapors simply does not capture ammonia or methylamine at serviceable concentrations. Workers in poultry confinement houses, hog operations, fertilizer application, aquaculture facilities, and certain laboratory environments need a cartridge specifically engineered for amine chemistry: one carrying NIOSH approval under the AM designation (42 CFR Part 84).

The Moldex 7407 is that cartridge in single-unit format. It fits the same bayonet mount used across the Moldex 7000, 7800, and 9000 series respirators. At the listed price per cartridge, it is the entry point for NIOSH-approved ammonia protection on the Moldex platform. Because a half-mask respirator requires two cartridges — one on each port — buying two 7407 singles costs the listed price versus roughly the listed price for the 7400 pair. That gap defines almost every purchase decision around this SKU.

This review focuses on the 7407's specific use cases, its chemical performance relative to the 7400 pair and competing AM-class options, and the total cost picture for agricultural, industrial, and laboratory buyers.

Editor's Rating: 4.3 / 5

The Moldex 7407 is the correct cartridge for ammonia and methylamine hazards in the Moldex ecosystem — nothing else on this platform covers those gases at NIOSH-approved levels. Its acid-impregnated adsorbent chemistry performs as specified. The single-unit format serves a real segment: replacement buyers who lost or saturated one cartridge, seasonal agricultural workers who want to trial the platform before buying pairs in bulk, and lab applications requiring only one fresh cartridge per use session. The economics penalize frequent buyers relative to the 7400 pair, and the absence of an End-of-Service-Life Indicator (ESLI) adds administrative burden. But for the right buyer at the right volume, the 7407 earns its place.

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Pros and Cons

Who Should Buy the 7407 vs. the 7400 Pair

Buy the 7407 single when:

• You need one replacement cartridge because one port was contaminated, damaged, or expired
• You are trialing the Moldex AM platform before ordering cartridges in bulk
• Your exposure is low-frequency seasonal (e.g., one fertilizer application per month) and you use a fresh cartridge each session
• You run a laboratory procedure requiring methylamine and replace one cartridge per experiment
• You manage a small operation with one or two workers and need to minimize per-order commitment
• You need odd quantities (one extra cartridge to complete a full set after replacing a single lost unit)

Buy the 7400 pair when:

• You are outfitting a respirator from scratch and need both ports covered — the pair is significantly cheaper per cartridge
• You run regular shift-based exposure (poultry house daily entry, continuous fertilizer blending) and change cartridges on a schedule
• You are equipping multiple workers and per-unit cost matters at volume
• You already know Moldex fit works for your face and platform preference is confirmed
• Your change schedule demands replacing both cartridges simultaneously at every interval

See the full Moldex 7400 pair review for a detailed analysis of the bulk economics and shift-work use case.

What the Moldex 7407 Does Well

AM-Specific Amine Sorbent Chemistry

The 7407 uses acid-impregnated adsorbent — not standard activated carbon. Ammonia (NH3) and methylamine (CH3NH2) are alkaline gases. Activated carbon cartridges rely on physisorption to trap vapor molecules in pore structures; that mechanism has low affinity for small, polar, alkaline molecules. Impregnating the sorbent with an acid creates a chemisorption reaction — the alkaline amine reacts with the acidic sites and is chemically retained rather than physically adsorbed. This is why NIOSH created a distinct AM approval class under 42 CFR Part 84 separate from organic vapor (OV). Standard OV cartridges, including the Moldex 7107 OV single, are not rated for ammonia and should not be substituted. See our cartridge selection guide for a full breakdown of NIOSH chemical class approvals.

Ammonia and Methylamine Vapor Coverage

The 7407 is NIOSH approved for both ammonia and methylamine — the two primary amine hazards in its target environments. Ammonia is the dominant concern in agricultural settings, refrigeration systems, and wastewater treatment. Methylamine is the relevant hazard in certain chemical synthesis, pharmaceutical, and research laboratory contexts. One cartridge handles both, which matters for operations where both compounds may be present (e.g., decomposing organic matter in confined animal feeding operations generates a mixture of amine species). The NIOSH approval under 42 CFR Part 84 confirms the cartridge meets minimum breakthrough criteria at rated concentrations under standardized test conditions.

Moldex Platform Compatibility

The bayonet twist-lock interface on the 7407 is shared across the entire Moldex chemical cartridge line. If you are already running a Moldex 7000 series half-mask with OV, P100, or multi-gas cartridges, the 7407 drops in without any hardware change. The same applies to the Moldex 9000 series full-face. This platform consistency is a practical advantage in operations that rotate workers across hazard zones requiring different cartridge types — the same facepiece inventory covers multiple chemical classes. Browse the full Moldex cartridge collection for a complete compatibility view.

Agricultural and Confined-Space Applications

Poultry confinement houses, hog barns, and beef feedlot enclosed areas routinely generate ammonia concentrations that exceed OSHA PEL (50 ppm ceiling) and ACGIH TLV (25 ppm TWA) thresholds during peak production or manure accumulation events. The 7407 addresses this directly. Fertilizer application workers — particularly those handling anhydrous ammonia or urea-ammonium nitrate solutions — face acute splash and vapor exposure during connection/disconnection tasks. Aquaculture systems that use ammonia-nitrogen monitoring occasionally generate localized high-concentration events. In all these scenarios, the 7407 provides the correct NIOSH-approved sorbent chemistry. For guidance on selecting respirators for specific agricultural settings, see our poultry farming respirator guide.

Methylamine Laboratory and Chemical Synthesis Use

Methylamine is a precursor chemical used in pharmaceutical synthesis, pesticide manufacturing, and research settings. Its TLV (ACGIH) is 5 ppm as a ceiling value — far lower than ammonia's. Laboratory workers who handle methylamine solutions, conduct amine condensation reactions, or work with methylamine gas cylinders require AM-class cartridge protection that is categorically different from OV protection. The 7407's single-unit packaging aligns with laboratory change schedules that require fresh cartridges per experiment or per shift, where purchasing full pairs may generate unnecessary cartridge waste. For related solvent and organic vapor protection needs in the same laboratory setting, the 7107 OV single handles separate solvent hazards on the same platform. More on choosing between cartridge types is in our solvent guide.

Where the Moldex 7407 Falls Short

Higher Per-Cartridge Cost Versus the 7400 Pair

Two 7407 singles cost the listed price to cover both ports of a half-mask respirator. The 7400 pair is listed at approximately the listed price for two cartridges on the Moldex catalog — making the 7400 pair far less expensive per cartridge for standard dual-port use. The 7407 single is priced as a convenience and replacement item. Workers or facilities that cycle through cartridges regularly on a written change schedule will find the 7400 pair substantially more economical at any meaningful volume. The cost premium for single-unit purchases is a real disadvantage for anyone who is not in a genuine replacement, trial, or low-frequency use scenario.

No End-of-Service-Life Indicator (ESLI)

The 7407 carries no colorimetric or electronic ESLI. Under OSHA 29 CFR 1910.134, Appendix B, employers using cartridges without an ESLI must implement a written change schedule based on cartridge capacity calculations, documented exposure levels, and historical usage data. For agricultural operations with variable ammonia concentrations — which can spike dramatically during manure agitation or ventilation failures — a time-based change schedule without ESLI introduces uncertainty. Workers cannot visually verify remaining service life. Ammonia does have a relatively low odor threshold (roughly 5 ppm) that may provide warning breakthrough, but OSHA does not allow reliance on olfactory warning for change schedule purposes. Review our cartridge selection guide for change schedule methodology.

No Particulate Protection — Upgrade Path to 7467

The 7407 is a gas-phase-only cartridge. It provides no filtration for dust, bioaerosols, mold spores, dander, endotoxins, or other particulates. In poultry and hog confinement environments — where ammonia and particulate exposures co-exist — the 7407 alone is incomplete. Workers in those settings typically need both AM-class gas protection and P100 particulate filtration simultaneously. The Moldex 7467 AM+P100 combination cartridge covers both in a single unit on the same bayonet platform and is the correct upgrade for dual-hazard environments. The 7407 is appropriate only where the hazard assessment confirms gas-phase-only exposure with no significant particulate component.

Comparison: 7407 Single vs. 7400 Pair vs. 3M 6004

AM Cartridge Options: Which Moldex Format is Right?

Note: The 7607 Multi-Gas cartridge does NOT cover ammonia or methylamine. Do not substitute it for AM-class protection.

Common questions

How many Moldex 7407 cartridges do I need for one respirator?

Half-mask respirators (7000 and 7800 series) require two cartridges — one on each port. Full-face respirators (9000 series) also require two cartridges. The 7407 is sold as a single unit. To outfit one half-mask respirator from scratch, you must purchase two 7407 singles (the listed price total) or consider the 7400 pair, which includes both cartridges in one package.

What is the difference between the Moldex 7407 and the 7400?

The 7407 is a single cartridge; the 7400 is a pair of two cartridges. Both use the same acid-impregnated adsorbent chemistry with identical NIOSH AM approval. The choice is entirely a purchasing format decision — single for replacement or trial use, pair for full respirator outfitting. See the full 7400 pair review for a detailed comparison.

Does the Moldex 7407 protect against organic vapors?

No. The 7407 is an AM-class cartridge engineered for ammonia and methylamine. It does not provide OV protection for solvents, paints, chlorinated hydrocarbons, or other organic vapors. If you need organic vapor protection on the same Moldex platform, use the 7107 OV single or 7307 OV/acid gas cartridge for those hazards.

Can I use the Moldex 7407 for poultry confinement house entry?

The 7407 addresses the ammonia vapor component of poultry confinement exposure. However, confinement houses also generate bioaerosols, dust, dander, and endotoxins that require particulate filtration. The 7407 alone does not provide particulate protection. For dual-hazard poultry environments, the Moldex 7467 AM+P100 combination cartridge covers both ammonia vapor and P100 particulates in one unit. See our poultry farming respirator guide for a full hazard assessment framework.

Does the Moldex 7407 fit the Moldex 7000 half-mask respirator?

Yes. The 7407 uses the Moldex bayonet twist-lock mount that is standard on the Moldex 7000 series (7001 S, 7002 M, 7003 L). It also fits the 9000 series full-face and 7800 series half-mask, though for 7800 compatibility it is advisable to confirm bayonet variant specifications with Moldex documentation before purchase.

How do I know when to replace the Moldex 7407 cartridge?

The 7407 has no ESLI (End-of-Service-Life Indicator). OSHA 29 CFR 1910.134, Appendix B requires a written change schedule when no ESLI is present. The schedule must be based on industrial hygiene monitoring data, cartridge capacity calculations, temperature, humidity, and expected exposure levels at your site. If any ammonia odor is detected through the cartridge, leave the contaminated area immediately and investigate the cause before returning — breakthrough, a poor face seal and a failed component all present the same way, and change the cartridge before returning. The scheduled interval remains the required basis under OSHA 29 CFR 1910.134(d)(3)(iii)(B). Never rely on smell as the primary change indicator; use it only as an emergency signal of a failed change schedule.

Can I use the Moldex 7407 for fertilizer application or anhydrous ammonia handling?

The 7407 is AM-class approved and appropriate for ammonia vapor exposures within its rated concentration range. Anhydrous ammonia handling during connection and disconnection tasks generates acute high-concentration exposures that may approach or exceed the NIOSH IDLH of 300 ppm for ammonia. At IDLH concentrations, SCBA or supplied-air respirators are required — air-purifying cartridges are not appropriate. Below IDLH with confirmed concentration monitoring, the 7407 is the correct cartridge format. Review your hazard assessment and consult your respiratory protection program coordinator before specifying cartridge versus supplied-air protection for anhydrous ammonia tasks.

Will the Moldex 7407 protect against methylamine in a laboratory setting?

Yes. The 7407 is NIOSH AM-approved for methylamine vapor, making it appropriate for laboratory work with methylamine gas or concentrated methylamine solutions where vapor inhalation hazard exists. The ACGIH TLV for methylamine is 5 ppm (ceiling), which is substantially below the NIOSH IDLH of 100 ppm. At workplace concentrations below IDLH with a confirmed hazard assessment, the 7407 on an appropriate Moldex platform provides NIOSH-approved methylamine vapor protection. The single-unit format is well-suited to laboratory change schedules that require fresh cartridges per experiment.

Why can I not use the Moldex 7607 multi-gas cartridge for ammonia?

The 7607 Multi-Gas Smart cartridge carries NIOSH approval for organic vapors, P100 particulates, and certain acid gases. It does not carry AM-class approval and uses a sorbent bed that is not effective for ammonia or methylamine. Using the 7607 in ammonia environments would provide no meaningful ammonia protection and constitutes a regulatory violation. Ammonia protection on the Moldex platform requires the 7407 single, 7400 pair, or 7467 AM+P100 combo.

What is the Assigned Protection Factor (APF) for the Moldex 7407?

The APF is determined by the respirator type, not the cartridge alone. When used in a properly fit-tested Moldex half-mask respirator, the APF is 10 per OSHA 29 CFR 1910.134, Table 1. When used in a Moldex 9000 series full-face respirator, the APF is 50. These APF values apply to ammonia concentrations. A half-mask with APF 10 may be used up to 10x the OEL; a full-face with APF 50 may be used up to 50x the OEL. Above those concentrations, supplied-air or SCBA is required.

Is the Moldex 7407 single cheaper per cartridge than the 7400 pair?

At the listed price per 7407 single versus approximately the listed price for the 7400 pair (approximately the listed price per cartridge equivalent), the 7407 single is cheaper per cartridge than the 7400 pair. Two 7407 singles to equip both ports cost the listed price. This means the 7407 single is the better per-cartridge value at low volume. The 7400 pair's higher list price may reflect packaging, distribution costs, or market positioning for the pair format rather than a volume discount. Compare current prices at the point of sale before assuming cost structure.

Does the Moldex 7407 provide acid gas protection?

No. The 7407 is an AM-class cartridge engineered specifically for alkaline amine gases (ammonia and methylamine). It does not cover acid gases such as chlorine, hydrogen chloride, sulfur dioxide, or hydrogen sulfide. For acid gas protection on the Moldex platform, the 7307 OV/acid gas cartridge addresses those hazards. Note that the chemistry is incompatible in a single sorbent — acidic and alkaline gas sorbents cannot be combined without neutralizing one another. Separate cartridge types are required for separate gas classes.

What OSHA standard governs use of the Moldex 7407?

Use of the Moldex 7407 in workplace respiratory protection programs is governed by OSHA 29 CFR 1910.134 (general industry) or 29 CFR 1926.103 (construction), which require written respiratory protection programs, medical evaluation, fit testing, cartridge change schedules, and training. The NIOSH approval under 42 CFR Part 84 validates the cartridge's performance under standardized test conditions. OSHA's Appendix B to 1910.134 provides mandatory change schedule guidance for cartridges without ESLI. Agricultural operations below the threshold employee count may qualify for specific OSHA small-employer exemptions, but the underlying hazard evaluation and cartridge selection requirements still apply as a matter of worker safety best practice.

Where can I buy the Moldex 7407 ammonia cartridge?

The Moldex 7407 is reviewed on WC Safety with shipping across the US. It is also available through Amazon (verified NIOSH-approved product; confirm GTIN 092311740706 matches the listing). Browse the full Moldex cartridge collection for related AM, OV, and combination cartridge options. For bulk orders and B2B pricing, ask an industrial distributor.

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

Neighbouring references on this site: 3m 6004, 3m 60924, 3m versaflo tr-6360n ammonia/methylamine he cartridge 5-pack review, how to choose a respirator cartridge: complete selection guide, best respirator cartridge for ammonia, and respirator cartridge color chart.

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.