Honeywell N75001L vs N75002L: OV vs OV/Acid Gas Cartridge Compared

Honeywell North N75001L vs N75002L: Organic Vapor Only vs OV Plus Acid Gas — Which Cartridge Fits Your Hazard?

The Honeywell North N75001L and N75002L are chemical vapor cartridges for the North 7700 and 5500 series half-mask respirators. The single most important distinction between them: the N75001L covers organic vapor only, while the N75002L adds acid gas protection. Neither cartridge includes integrated P100 particulate filtration. This is a critical gap that is frequently overlooked — if your work environment generates dusts, mists, metal fumes, or any other airborne particulates alongside chemical vapors, you must either pair these cartridges with the appropriate North prefilter or switch entirely to a combination P100L cartridge such as the 7581P100L or 7583P100L.

Side-by-Side Comparison

Understanding the N75001L: Organic Vapor Only

The Honeywell North N75001L is a NIOSH-approved organic vapor cartridge. It uses an activated carbon sorbent bed to adsorb organic vapor contaminants — a broad class of volatile organic compounds including toluene, xylene, acetone, methanol, ethanol, isopropyl alcohol, and many others. The N75001L is appropriate when your SDS Section 2 identifies organic vapor as the only inhalation hazard and when particulate generation is controlled by engineering or is absent.

The N75001L does not protect against inorganic acid gases (HCl, SO2, Cl2, HF), ammonia, carbon monoxide, carbon dioxide, or formaldehyde. If any of these appear as hazards in your workplace SDS, a different cartridge is required.

The N75001L pairs with separate North prefilters when particulates are also present. This two-piece approach (cartridge plus prefilter) offers more flexibility than a combination P100L cartridge — prefilters can be replaced independently when they load with particulate without discarding the remaining chemical capacity in the cartridge body.

Understanding the N75002L: OV Plus Acid Gas

The Honeywell North N75002L extends OV protection with an additional impregnated sorbent stage that captures inorganic acid gases including hydrogen chloride (HCl), sulfur dioxide (SO2), and chlorine (Cl2). If your work involves pickling operations, bleach handling, chlorinated solvent processes, battery maintenance with sulfuric acid mist, or any process generating chlorinated or sulfur-containing fumes, the N75002L is the appropriate selection.

Like the N75001L, the N75002L does not include P100 particulate filtration. In environments with both chemical vapors and particulates, consider the Honeywell North 7583P100L combination cartridge — a single unit providing OV, acid gas, and P100 filtration without requiring a separate prefilter.

The Particulate Gap: A Compliance and Health Risk

Many workers assume that any respirator cartridge provides complete protection. It does not. The N75001L and N75002L are chemical-only cartridges using activated carbon sorbent. They do not physically filter particles. In environments where welding fumes, grinding dust, asbestos, lead dust, silica, or other particulates are present alongside chemical vapors, using these cartridges without a prefilter leaves workers unprotected against the particulate fraction of the hazard.

OSHA 29 CFR 1910.134(d) requires that respirator selection address all identified hazards. Selecting a cartridge that covers only some workplace hazards violates OSHA 29 CFR 1910.134 and creates genuine health risk. The industrial hygienist or safety officer must identify all airborne hazards — chemical and particulate — before selecting cartridges.

When to Choose Each Option

Choose the N75001L when: your SDS lists organic vapor as the only inhalation hazard, no acid gases are generated by your process, and particulate generation is negligible or fully controlled by engineering. The N75001L is the lower-cost, lower-resistance option for clean OV-only environments.

Choose the N75002L when: your SDS lists both organic vapor and acid gas hazards (HCl, SO2, Cl2), no particulates are generated or particulates are controlled separately, and you need the broadest chemical-only vapor coverage in a single cartridge without P100 weight and resistance.

Choose the 7581P100L when: both organic vapor and particulates are present and no acid gas hazard exists.

Choose the 7583P100L when: organic vapor, acid gas, and particulates are all present — one cartridge covers all three hazard classes.

OSHA 29 CFR 1910.134 Requirements

Using the N75001L or N75002L in a mandatory respirator use program requires a written respiratory protection program per OSHA 29 CFR 1910.134, including: written program documentation, medical evaluation before initial use, annual fit testing, a documented cartridge change schedule, employee training, and written maintenance and inspection procedures. Voluntary use of chemical cartridge respirators (where exposure is below PEL and respirator use is employee choice) requires a less comprehensive program but still requires distributing OSHA 29 CFR 1910.134 Appendix D to employees.

Compatible Facepieces

Both the N75001L and N75002L use the North bayonet mount and are compatible with the Honeywell North 7700 series half-mask (small, medium, large) and the Honeywell North 5500 series half-mask. They are not cross-compatible with 3M, MSA, or Moldex facepieces.

Service Life and Change Schedules

Activated carbon OV cartridge service life is affected by contaminant concentration, relative humidity (high humidity degrades OV capacity significantly), temperature, breathing rate, and whether the cartridge was stored open. OSHA requires a written change schedule. Use modeling tools such as the NIOSH Carcinogen Safety Advisor or OSHA's Respirator Change Schedule resources to estimate service life under known conditions. Practical minimum: change at end of shift or upon any detectable odor breakthrough.

Related Products at WC Safety

• Honeywell North N75001L and N75002L cartridges
• 7581P100L and 7583P100L combination cartridges
• Honeywell North 7700 and 5500 half-mask respirators
• Full respiratory protection at WC Safety
• N95 and disposable respirator alternatives

Frequently Asked Questions