Honeywell North N75004L Ammonia Cartridge — Methylamine, North Bayonet

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Read our hands-on Honeywell North N75004L review for field-tested buyer notes.

Honeywell North N75004L Ammonia Cartridge Overview

The Honeywell North N75004L ammonia cartridge is a NIOSH-approved, green-band cartridge that snaps onto North bayonet half- and full-face respirators to protect against ammonia and methylamine. It is the dedicated ammonia cartridge in the North N-series for refrigeration, fertilizer, water treatment and cleaning. If you are deciding which gas class you need, start with our guide to choosing a respirator cartridge and the Honeywell North cartridge guide, then confirm the color code on the respirator cartridge color chart.

As a Honeywell North ammonia cartridge, the N75004L belongs to the Honeywell North respirator filters and cartridges family. Buy the N75004L cartridge when your hazard is ammonia or methylamine; choose a different cartridge for organic vapor, acid gas or dust.

Where the N75004L Fits in Cartridge Selection

Confirm the hazard before the cartridge. The N75004L handles ammonia and methylamine gas — but not organic vapor, not acid gas, and not airborne particles. If you are weighing gas classes or adding dust protection, our organic vapor vs P100 guide and respirator filter types explained walk through the difference. When ammonia and dust are both present, add a prefilter or move to a combination cartridge.

Who Should Buy the N75004L?

Buy it if your exposure is ammonia or methylamine — ammonia refrigeration plants, fertilizer handling, water treatment, and ammonia-based cleaning. Choose another cartridge if your job adds a second hazard: pick the N75001L for organic vapor, the N75002L for acid gas, the 75SCL Defender for multi-gas, or add particulate with the 7584P100L ammonia/P100 combination.

What Does the N75004L Protect Against?

Hazard	N75004L fit	Buyer guidance
Ammonia & methylamine	Yes	Primary use — this is what the N75004L is built for.
Dust / mist	No (alone)	Add a 7506 prefilter, or use the 7584P100L combo.
Organic vapor, acid gas	No	Use the N75001L, N75002L or 75SCL instead.

What the N75004L Does NOT Protect Against

The N75004L does not stop organic vapor (choose the N75001L), acid gas (N75002L), the broadest mix of gases (75SCL Defender), or particulate, which needs a 7580P100 filter.

No air-purifying cartridge makes a dangerous atmosphere safe. Never use the N75004L in an oxygen-deficient or IDLH (immediately dangerous to life or health) atmosphere, in unknown concentrations, or against gases with no warning properties — those conditions require a supplied-air or SCBA system, not a cartridge respirator.

Best Applications

Ammonia refrigeration & fertilizer

Anhydrous-ammonia refrigeration plants and fertilizer handling are the N75004L's core use. See the broader options in our best respirator for chemical workers guide.

Water treatment & cleaning

Ammonia-based treatment and cleaning release the gas the N75004L captures. If other gases are also present, compare the broader option in our 75SCL multi-gas comparison.

Pros & Cons

Compatible North Respirators

The N75004L uses the North bayonet connection, so it mounts on the North half-mask respirators (5500 and 7700 series) and North full-face respirators (5400 and 7600 series). For dust as well, fit a North 7506-series prefilter over the cartridge. It does not fit 3M or MSA facepieces.

Respirator	Type	Compatible?
North 5500 series	Half mask	Yes — bayonet
North 7700 series	Half mask	Yes — bayonet
North 7600 series	Full face	Yes — bayonet
North 5400 series	Full face	Yes — bayonet
3M / MSA	Half / full	No (not bayonet-compatible)

N75004L vs Other North Cartridges

Cartridge	Protects against
N75001L	Organic vapor
N75002L	Acid gas
N75003L	Organic vapor + acid gas
7584P100L	Ammonia + P100

N75004L vs the Alternatives

If you are weighing the N75004L against another North cartridge, the decision comes down to which hazards you face:

• N75004L vs 7584P100L: the N75004L is gas only; the 7584P100L builds in a P100 filter for ammonia + dust.
• N75004L vs 75SCL Defender: the N75004L is ammonia only; the 75SCL covers a broad multi-gas mix including ammonia. See the 75SCL breakdown →
• N75004L vs N75002L: the N75004L covers ammonia; the N75002L covers acid gas — opposite ends of the gas spectrum.

N75004L Quick Answers

Is the Honeywell North N75004L reusable?

The cartridge is reusable until its service life is reached; replace it on schedule or when you detect ammonia odor. The respirator itself is reusable across many cartridge changes.

What color band is the N75004L?

Green — the NIOSH code for ammonia and methylamine. Match the band to the hazard with the cartridge color chart.

Does the N75004L fit North 5500 and 7700 respirators?

Yes. The North bayonet connection fits the 5500 and 7700 series half masks and the 5400 and 7600 series full-face respirators.

Is the N75004L good for anhydrous ammonia?

Yes — ammonia is what the N75004L is built for, within its concentration limits; for very high levels use a supplied-air system instead.

N75004L Specifications

Gas class	Ammonia / Methylamine
NIOSH band	Green
Connection	North bayonet
Particulate filter	None (add 7506 prefilter, or use 7584P100L)

Helpful Buying Guides

• Honeywell North cartridge guide
• How to choose a respirator cartridge
• Organic vapor vs P100
• Respirator cartridge color chart
• Respirator filter types explained
• Honeywell North vs 3M respirators

Honeywell North N75004L Frequently Asked Questions

What does the Honeywell North N75004L protect against?

The N75004L is an ammonia and methylamine cartridge. It adsorbs ammonia (including anhydrous ammonia vapor) and methylamine, but not organic vapor, acid gas, dust, fume or oil mist.

Which respirators does the N75004L fit?

It uses the North bayonet connection, so it fits North 5500 and 7700 series half masks and North 5400 and 7600 series full-face respirators. It does not fit 3M or MSA respirators.

Does the N75004L filter dust or particulates?

No. The N75004L is a gas-and-vapor cartridge with no particulate filter. Fit a North 7506-series prefilter over it, or step up to the 7584P100L ammonia/P100 combination.

What color band is the N75004L?

Green — the NIOSH color code for ammonia and methylamine.

Is the N75004L NIOSH-approved?

Yes, for ammonia and methylamine under 42 CFR Part 84. You can verify any cartridge against the NIOSH Certified Equipment List.

How often should I replace the N75004L?

Replace it on a documented change-out schedule, or sooner if you detect ammonia odor, get irritation, or breathing becomes harder. It has no end-of-service-life indicator.

What is the difference between the N75004L and the N75003L?

The N75004L is ammonia and methylamine only; the N75003L is organic vapor and acid gas.

Can I use the N75004L for anhydrous ammonia in refrigeration?

Yes — ammonia is what the N75004L is designed for, within its concentration limits. For very high or unknown levels, use a supplied-air system instead.

Is the N75004L the same as a particulate filter?

No. It is a gas cartridge, not a particulate filter. For dust and mist use a P100 such as the 7580P100, or the 7584P100L combo.

Is this the genuine Honeywell North N75004L cartridge?

Yes. WC Safety sells authentic, NIOSH-approved Honeywell North ammonia cartridges through legitimate supply channels.

Can I buy the N75004L in bulk or by the case?

Yes. Use the Request a Quote option for case and pallet pricing on volume orders.

How should I store the N75004L?

Store it sealed in its original packaging, away from ammonia, so its service life is not used up before you wear it.