Best Respirator Cartridge for Ammonia (2026 Guide)

Ammonia Needs a Green Cartridge — and the Right One Depends on What Else Is in the Air

Reviewed by WC Safety Editorial Team — Last updated: May 2026.

Short answer: For ammonia-only work, the dedicated Honeywell North 7584P100L ammonia/methylamine cartridge with P100 (vendor: Honeywell North; SKU: 7584P100L) is the focused, cost-effective pick. When ammonia is one of several gas hazards — common in wastewater, fertilizer, and chemical plants — step up to the all-around Honeywell North 75SCP100L (SKU 75SCP100L), which adds organic vapor and acid gas in the same cartridge. Ammonia is an inorganic alkaline gas, so an organic-vapor-only cartridge will not protect you.

Know your limits: OSHA's ammonia PEL is 50 ppm (8-hr TWA); NIOSH recommends 25 ppm TWA / 35 ppm STEL; and the IDLH is 300 ppm. Above IDLH — realistic during anhydrous ammonia releases — air-purifying cartridges are prohibited and supplied air or SCBA is required. See the Honeywell North Cartridge Guide for selection details.

Quick Reference: Ammonia Respiratory Hazard

Factor	Detail
OSHA PEL (8-hr TWA)	50 ppm (29 CFR 1910.1000, Table Z-1)
NIOSH REL	25 ppm TWA / 35 ppm STEL
IDLH	300 ppm — above this, supplied air/SCBA only
Cartridge type	Ammonia/methylamine (green) + P100
Warning properties	Pungent odor, often below PEL — but odor is not a compliant change indicator
Eye protection	Strong irritant — favor full-face at higher concentrations

Where Ammonia Exposure Happens

• Anhydrous ammonia refrigeration: cold storage, food processing, ice plants — large systems fall under OSHA Process Safety Management (1910.119).
• Wastewater treatment: ammonia alongside chlorine and hydrogen sulfide.
• Fertilizer production & agriculture: anhydrous ammonia application and storage.
• Chemical & pharmaceutical manufacturing: ammonia and methylamine as reagents.
• Cleaning & janitorial: concentrated ammonia solutions in enclosed spaces.

Respirator Cartridge for Anhydrous Ammonia (Agriculture & Refrigeration)

Anhydrous ammonia — the compressed, water-free liquid used as agricultural fertilizer and industrial refrigerant — is the most demanding ammonia scenario. As a respirator for anhydrous ammonia, a green ammonia/methylamine cartridge with P100 (the 7584P100L) on a fit-tested full facepiece is correct for routine work and minor leaks within concentration limits. But anhydrous ammonia is unforgiving: it boils at −28°F, strips moisture from skin and eyes, and a hose break during a nurse-tank transfer can exceed the 300 ppm IDLH in seconds.

• Agricultural ammonia respirator (farming): for nurse tanks and knife injection, use a full-face anhydrous ammonia cartridge setup (green NH₃/MA + P100), keep an emergency water supply within reach, and stage an escape respirator. The dedicated 7584P100L is the standard ammonia respirator cartridge for farming; step up to the 75SCP100L if you also handle solvents or acid-forming chemistries.
• Refrigeration engine rooms: ammonia/methylamine + P100 for routine inspection and minor-leak response; for charging, major leaks, or confined spaces, supplied air or SCBA is mandatory.
• The hard limit: at or above 300 ppm IDLH — entirely possible during an anhydrous release — no cartridge is permitted. Use a supplied-air respirator or SCBA.

Dedicated vs. All-Around: Pick by Your Hazard Mix

Cartridge	Coverage	Best For
7584P100L (Dedicated Pick)	Ammonia + Methylamine + P100	Ammonia-only, refrigeration, agriculture
75SCP100L (All-Around Pick)	OV + Acid Gas + NH₃/MA + P100	Wastewater, chemical plants, mixed hazards
N75004L	OV + NH₃ (gas-only, no P100)	OV + ammonia, particles confirmed absent
75SCL	OV + Acid Gas + NH₃ (gas-only)	Broad gas coverage, lower breathing resistance

7584P100L vs 75SCP100L: Head to Head

The two Honeywell North picks differ on exactly one axis: breadth of gas coverage. Here is the direct comparison.

Feature	7584P100L	75SCP100L
Ammonia	Yes	Yes
Organic Vapor	No	Yes
Acid Gas	No	Yes
P100	Yes	Yes
Cost	Lower	Higher
Best For	Dedicated ammonia	Mixed hazards

Bottom line: if ammonia and methylamine are your only confirmed hazards, the 7584P100L saves money and breathing resistance. If your air also contains solvents or acid gases — or you simply don't know — the 75SCP100L removes the guesswork and earns 4.8/5 in our editorial review.

3M Cross-Brand Ammonia Options

If your crews are fit-tested on 3M facepieces instead of Honeywell North, here are the direct 3M equivalents. Cartridges are not universal — 3M cartridges fit 3M facepieces only, and North cartridges fit North only.

Honeywell North	3M Equivalent	Coverage
7584P100L	3M 60924	Ammonia/Methylamine + P100
75SCP100L	3M 60926	Multi-gas (incl. ammonia) + P100
N75004L	3M 6004	Ammonia/Methylamine (gas-only)

For a full cross-brand breakdown of the multi-gas tier, see 75SCP100L vs 3M 60926.

Related 3M respirators: a 3M cartridge mounts on a 3M bayonet facepiece only — never on a Honeywell North mask. Pair the 3M 60924 or 3M 6004 with a 3M facepiece such as the 3M 7502 silicone half mask (APF 10; also S/L) or, for eye protection at higher concentrations, the 3M 6900 full facepiece (APF 50). Browse all 3M half-mask respirators. The cross-brand multi-gas option, the 3M 60926, fits the same 3M facepieces.

Facepiece & Fit (Honeywell North & 3M)

Each Honeywell North cartridge here seats on the North bayonet system: the North 5500/7700 half masks (APF 10) and the North 5400/7600 full facepieces (APF 50). The 3M cartridges above instead seat on 3M facepieces such as the 3M 7502 half mask or 3M 6900 full facepiece — the two systems are not interchangeable. Because ammonia is a strong eye irritant, favor a full facepiece at higher concentrations. A successful fit test under OSHA 1910.134(f) is required before any tight-fitting respirator is used.

Change-Out & When to Step Up to Supplied Air

Ammonia's odor is often detectable below the PEL, but OSHA still requires a written change-out schedule under 1910.134(d)(3) — odor is not a compliant end-of-service indicator. Replace immediately on odor breakthrough, eye or respiratory irritation, or liquid contamination. And remember the ceiling: at or above the 300 ppm IDLH — entirely possible during an anhydrous ammonia release — cartridges are prohibited and you must use a supplied-air respirator or SCBA.

Cartridge Selection Resources

Choosing a cartridge starts with two questions: what is in the air? and what facepiece am I on? These guides walk through both:

• How to choose a respirator cartridge — the 5-step selection framework.
• Respirator cartridge color chart — what each NIOSH color band means, including the green ammonia code.
• Organic vapor vs P100 (gas vs particulate) — why a P100 filter alone never stops a gas.
• Are respirator cartridges universal? — why North and 3M cartridges are not cross-compatible.
• Best respirator cartridge for formaldehyde — the companion hazard guide.

Frequently Asked Questions

What is the best respirator cartridge for ammonia?

For ammonia-only work, the dedicated Honeywell North 7584P100L ammonia/methylamine + P100 cartridge. For mixed-hazard environments, the all-around 75SCP100L covers ammonia plus OV, acid gas, and P100.

Does the Honeywell North 75SCP100L protect against ammonia?

Yes — ammonia and methylamine, plus organic vapor, acid gas, and a 99.97% P100 filter. It is the best all-around pick when ammonia appears alongside other hazards. Confirm on the NIOSH approval and your SDS.

What is the ammonia cartridge color code?

Ammonia/methylamine cartridges are green; a P100 combination adds a magenta band. Always read the printed NIOSH approval to confirm ammonia coverage, not just the color.

What is the OSHA PEL for ammonia?

50 ppm as an 8-hour TWA (29 CFR 1910.1000, Table Z-1). NIOSH recommends a lower 25 ppm TWA / 35 ppm STEL.

What is the IDLH for ammonia?

300 ppm. At or above 300 ppm, in oxygen-deficient atmospheres, or for unknown concentrations, use a supplied-air respirator or SCBA — not a cartridge.

7584P100L vs 75SCP100L for ammonia — which should I choose?

Choose the 7584P100L for ammonia/methylamine only — it's the dedicated, lower-cost option. Choose the 75SCP100L if you also face OV or acid gas, or if the hazard mix is uncertain.

Does the cartridge cover methylamine too?

Yes — both the 7584P100L and 75SCP100L are NIOSH-approved for ammonia and methylamine, which often occur together.

What respirator cartridge do I need for anhydrous ammonia?

For routine work and minor leaks within limits, an ammonia/methylamine cartridge with P100 (e.g. the 7584P100L) on a fit-tested full facepiece. Anhydrous transfers and releases can exceed the 300 ppm IDLH instantly, so keep supplied air/SCBA and escape respirators available; large systems fall under OSHA PSM (1910.119).

What is the best ammonia respirator cartridge for farming and agriculture?

For anhydrous ammonia application (nurse tanks, knife injection), a green ammonia/methylamine cartridge with P100 on a full facepiece. The 7584P100L is the dedicated pick; the 75SCP100L adds OV/acid-gas coverage for mixed farm chemicals. Keep emergency water and an escape respirator on hand.

Can a P100 filter alone protect against ammonia?

No — and this is a dangerous, common mistake. Ammonia is a gas; a P100 filter only captures particulates and gives zero gas protection. You need an ammonia/methylamine chemical cartridge. A combination cartridge adds P100 for aerosols.

Is the 3M 60924 the same as the Honeywell 7584P100L?

Functionally equivalent — both are ammonia/methylamine + P100 — but not interchangeable. The 3M 60924 fits 3M facepieces only; the 7584P100L fits Honeywell North only. Match the cartridge to your facepiece brand.

Are respirator cartridges universal across brands?

No. Each manufacturer uses a proprietary mount — North bayonet cartridges fit only North facepieces, and 3M cartridges fit only 3M. Never force one brand's cartridge onto another brand's respirator. See 75SCP100L vs 3M 60926.

Half-mask or full-face for ammonia?

Half-mask is APF 10; full-face is APF 50 and protects the eyes, important because ammonia is a strong eye irritant.

How often do I change ammonia cartridges?

Per a written schedule under OSHA 1910.134(d)(3) based on concentration, temperature, humidity, and work rate. Replace immediately on odor breakthrough, irritation, or liquid contamination.

What respirator do wastewater workers use for ammonia?

The 75SCP100L covers ammonia, chlorine and other acid gases, and P100 in one cartridge. Note hydrogen sulfide is escape-only — routine H₂S entry needs gas detection and supplied air.

Does ammonia have good warning properties?

Its pungent odor is often detectable below the PEL — better warning than formaldehyde. Even so, OSHA still requires a written change-out schedule; odor alone is not compliant.

Is ammonia an organic vapor?

No — ammonia is an inorganic alkaline gas requiring a dedicated ammonia/methylamine sorbent. Organic-vapor-only cartridges do not protect against it.

Where can I buy an ammonia respirator cartridge?

WC Safety stocks the dedicated 7584P100L, the all-around 75SCP100L, and 3M equivalents. Pair with a fit-tested facepiece of the same brand for a complete NIOSH-approved assembly.

Disclosures & editorial standards
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