Honeywell North 75852P100L Review
WC Safety Editorial Verdict: 4.6/5
WC Safety Editorial Verdict: 4.6/5. The Honeywell North 75852P100L is the only NIOSH-approved cartridge in the entire North line that protects against elemental mercury vapor, so for dental amalgam work, mercury-cell chlor-alkali plants, and gold amalgamation it isn't really competing against anything — it's the single correct answer. The built-in chlorine (Cl₂) coverage and P100 particulate stage make it a genuine two-hazards-in-one cartridge, though the specialized iodinated-carbon sorbent means a shorter shelf life and a more conservative change-out discipline than a standard OV cartridge. We dock points only because it's a narrow-purpose part with no margin for substitution error — confirm your hazard against a proper how to choose a respirator cartridge assessment before buying.
Is the Honeywell North 75852P100L the Only Option for Mercury Vapor Protection in the North Line?
Published · Last updated
Yes — the Honeywell North 75852P100L is the sole Honeywell North cartridge carrying NIOSH approval for mercury vapor protection. It combines mercury vapor adsorption (via iodinated activated carbon), chlorine gas protection, and P100 particulate filtration (99.97%). For dental offices, chlor-alkali facilities, gold mining operations, and any environment with mercury vapor exposure, there is no alternative in the North cartridge ecosystem.
Editorial Verdict — 75852P100L: 4.6/5
Irreplaceable for mercury environments — no other North cartridge provides Hg vapor protection. Chlorine coverage is a bonus for chlor-alkali applications. If mercury is your hazard, this is the only NIOSH-approved North cartridge option.
Irreplaceable for mercury environments — no other North cartridge provides Hg vapor protection. Chlorine coverage is a bonus for chlor-alkali applications. If mercury is your hazard, this is the only NIOSH-approved North cartridge option.
Specifications
| Feature | Details |
|---|---|
| Model | 75852P100L |
| Mercury Protection | Mercury vapor (Hg) — iodinated carbon sorbent |
| Chlorine Protection | Cl₂ (chlorine gas) |
| Particle Protection | P100 — ≥99.97% |
| Sold As | Pair |
| NIOSH Approval | Yes — 42 CFR Part 84 |
Mercury Vapor: Why Specialized Sorbent Is Required
Standard activated carbon (used in OV cartridges) does not effectively adsorb elemental mercury vapor. The 75852P100L uses iodinated activated carbon — carbon impregnated with iodine — where mercury reacts chemically with the iodine to form mercury iodide, a solid retained in the carbon bed. This chemisorption process is highly effective for elemental mercury vapor but is not rated for organic mercury compounds (methylmercury, dimethylmercury) which have different chemistry.
Primary Applications
- Dental offices: amalgam placement, removal, and polishing — mercury vapor is released from dental amalgam during preparation and removal
- Chlor-alkali plants: mercury cell chlor-alkali process produces both Hg vapor and Cl₂
- Gold mining and processing: artisanal and small-scale gold mining often uses mercury amalgamation
- Thermometer / instrument manufacturing: facilities using mercury in gauges and scientific instruments
- Research laboratories: work with liquid mercury, mercury compounds, or equipment containing mercury
OSHA Mercury Exposure Limits
OSHA PEL for mercury vapor: 0.1 mg/m³ as a ceiling. ACGIH TLV: 0.025 mg/m³ TWA. NIOSH REL: 0.05 mg/m³ TWA. Mercury vapor IDLH: 10 mg/m³. A half-face respirator with 75852P100L (APF 10) protects up to 1 mg/m³; a full-face (APF 50) up to 5 mg/m³.
Compatible with all Honeywell North bayonet respirators including the North 5500 Series half-face, North 7600 and 5400 Series full-face respirators. Not compatible with 3M bayonet respirators — Honeywell North and 3M use different mounting systems.
Browse all Honeywell North respirator cartridges or see the full respirator cartridge and filter selection at WC Safety.
Frequently Asked Questions
Q: Is the 75852P100L the only Honeywell North cartridge approved for mercury vapor?
A: Yes — the 75852P100L is the only cartridge in the Honeywell North line with NIOSH approval for elemental mercury vapor. No other North cartridge provides mercury protection.
Q: What type of activated carbon is in the 75852P100L?
A: Iodinated activated carbon — activated carbon impregnated with iodine. Mercury vapor reacts with the iodine to form mercury iodide (HgI₂), a solid that is retained in the carbon bed. This chemisorption is specific to elemental mercury vapor.
Q: Does the 75852P100L protect against organic mercury compounds?
A: No — the 75852P100L is approved for elemental mercury vapor only, not organic mercury compounds such as methylmercury or dimethylmercury. Organic mercury compounds require specialized protection approaches and consultation with an industrial hygienist.
Q: What is the OSHA PEL for mercury vapor?
A: OSHA PEL for mercury vapor (as a ceiling) is 0.1 mg/m³. The ACGIH TLV-TWA is 0.025 mg/m³. NIOSH REL is 0.05 mg/m³ TWA. Mercury IDLH is 10 mg/m³.
Q: Can I use the 75852P100L for dental amalgam work?
A: Yes — the 75852P100L is the appropriate cartridge for dental amalgam placement and removal. Mercury vapor is released during amalgam manipulation; the iodinated carbon sorbent captures elemental Hg vapor while the P100 filter captures amalgam particles.
Q: Does the 75852P100L protect against chlorine gas?
A: Yes — chlorine (Cl₂) protection is included in the NIOSH approval for the 75852P100L. This makes it suitable for chlor-alkali facilities where both mercury vapor and chlorine are co-hazards.
Q: How do I know when to replace 75852P100L cartridges?
A: Mercury vapor has a sweet metallic taste at detectable concentrations — replace immediately on any detection. Use the most conservative change schedule in your written program. Unlike OV cartridges where odor threshold is near or below PEL for many solvents, mercury taste/odor may not occur until high concentrations. Base replacement on time and concentration data from your IH assessment.
Q: Does the 75852P100L cover organic vapors or acid gases?
A: No — the 75852P100L does not include OV or general acid gas protection. If organic vapors are also present alongside mercury, consult an industrial hygienist — combination cartridges for mercury + OV are limited options and the problem requires careful assessment.
Q: What respirators are compatible with the 75852P100L?
A: All Honeywell North bayonet respirators: 5500 Series half-face, 7600 Series full-face, 5400 Series full-face. Not compatible with 3M.
Q: Is the 75852P100L NIOSH-approved?
A: Yes — NIOSH-approved under 42 CFR Part 84 for mercury vapor + chlorine + P100.
Q: What is the shelf life of 75852P100L cartridges?
A: Iodinated carbon cartridges have a shorter shelf life than standard activated carbon cartridges because iodine can volatilize over time, reducing mercury adsorption capacity. Store in original sealed packaging, check expiration dates, and do not use expired mercury cartridges — the safety margin is too critical.
Q: Where can I buy the Honeywell North 75852P100L?
A: At WC Safety. Browse all Honeywell North cartridges.
OSHA Assigned Protection Factors: Respirator Type Determines Protection Level
A critical and frequently misunderstood principle: the protection factor (APF) is determined by the respirator type, not the cartridge. The cartridge determines which chemicals are protected against; the facepiece type determines how much protection is provided relative to the permissible exposure limit (PEL).
| Respirator Type | OSHA APF (29 CFR 1910.134 App A) |
|---|---|
| Half-face air-purifying (e.g., North 5500 Series) | APF 10 — protects up to 10× the PEL |
| Full-face air-purifying (e.g., North 7600/5400 Series) | APF 50 — protects up to 50× the PEL |
| Powered air-purifying (PAPR), half-face | APF 50 |
| Powered air-purifying (PAPR), full-face/hood | APF 1000 |
Example: if the OSHA PEL for a solvent is 100 ppm, a half-face respirator (APF 10) with the appropriate cartridge protects up to 1,000 ppm; a full-face (APF 50) protects up to 5,000 ppm. If your measured air concentration exceeds the APF × PEL product, you need a higher APF respirator or must implement engineering controls to reduce concentration.
OSHA 1910.134 Cartridge Change Schedule Requirements
OSHA 29 CFR 1910.134(d)(3)(iii)(B) requires that atmospheres immediately dangerous to life or health (IDLH), oxygen-deficient atmospheres, and environments with gas or vapor cartridges must have a cartridge change schedule based on objective information. Specifically, the standard requires:
- A written change schedule based on objective data — measured concentrations, published service life tables, or ESLI (end-of-service-life indicator) performance data
- The change schedule must address the specific chemicals present, their concentrations, temperature, humidity, and work rate
- Leave the area, then replace if the wearer detects any odor, taste, or irritation 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. Warning properties are not a permitted basis for the change schedule under OSHA 29 CFR 1910.134(d)(3)(iii)(B)
- Cartridges must be replaced before being stored and reused — carbon that has partially adsorbed contaminants may release them during storage and re-entry
- Written records of the change schedule must be made available to employees upon request
Failure to maintain a written cartridge change schedule is one of the most commonly cited OSHA violations in respiratory protection programs. If you are building or auditing a respiratory protection program, the OSHA Small Entity Compliance Guide for Respiratory Protection (OSHA 3384) provides a detailed walkthrough of change schedule requirements.
Mercury Exposure in the Workplace: Regulatory Framework
Mercury vapor exposure is addressed by multiple regulatory bodies:
- OSHA: PEL 0.1 mg/m³ as a ceiling (General Industry 29 CFR 1910.1000 Table Z-2)
- ACGIH: TLV-TWA 0.025 mg/m³ (7× more conservative than OSHA PEL)
- NIOSH: REL 0.05 mg/m³ TWA; IDLH 10 mg/m³
- ADA (dental): Occupational Safety Committee guidelines for dental amalgam handling include requirements for mercury vapor monitoring and appropriate respiratory protection
- EPA: National Emission Standards for Hazardous Air Pollutants (NESHAP) regulate mercury emissions from industrial sources — facilities with significant mercury use have additional compliance requirements
The ACGIH TLV of 0.025 mg/m³ is the most commonly used exposure guideline in industrial hygiene practice. A half-face respirator with 75852P100L (APF 10) provides protection up to 0.25 mg/m³ — 10× the TLV. A full-face (APF 50) protects up to 1.25 mg/m³. In most dental office and laboratory applications, this is more than adequate for routine amalgam work. For chlor-alkali and mining applications with potentially higher concentrations, full-face protection is more appropriate.
Dental Amalgam Considerations
Dental amalgam is approximately 50% elemental mercury by weight. Mercury vapor is released during:
- Amalgam preparation: trituration (mechanical mixing) in triturators may release mercury vapor if the device is not sealed
- Placement: condensation of amalgam into the cavity preparation releases vapor
- Removal: cutting existing amalgam restorations with high-speed handpieces generates the highest mercury vapor concentrations — this is the critical exposure event in dental offices
- Polishing: finishing and polishing amalgam restorations releases moderate vapor
The ADA and OSHA both recommend engineering controls (high-volume evacuation, room ventilation) as primary mercury control measures in dental settings, with respiratory protection as a supplementary measure for procedures known to generate high concentrations. The 75852P100L is the appropriate supplementary protection for amalgam removal procedures where significant vapor generation is expected.
Selecting the Right Honeywell North Respirator for Your Cartridge
North bayonet cartridges work with three respirator product lines. Selecting the correct respirator determines your protection level:
- North 5500 Series half-face: APF 10; available in S, M, L sizes; silicone facepiece; recommended for most industrial environments with exposures ≤10× PEL
- North 7600 Series full-face: APF 50; panoramic lens; appropriate for IDLH environments below IDLH concentration when combined with correct cartridges; also provides eye protection
- North 5400 Series full-face: APF 50; traditional lens design; often used in specialty industrial applications requiring specific optical characteristics
For all respirator-cartridge combinations, the facepiece must be NIOSH-approved as part of an approved assembly. Verify compatibility in the NIOSH NPPTL Certified Equipment List (CEL) before deploying a new combination in your respiratory protection program.
Additional Frequently Asked Questions
Q: Can the 75852P100L be used for gold prospecting with mercury amalgamation?
A: Artisanal gold mining using mercury amalgamation generates high mercury vapor concentrations — among the highest occupational exposures documented globally. The 75852P100L on a half-face provides APF 10; for amalgam burning (retorting) which generates very high concentrations, a full-face respirator with 75852P100L (APF 50) is more appropriate. Ideally, mercury amalgamation in gold mining should be replaced with alternative processes where possible.
Q: How quickly do iodinated carbon cartridges expire compared to standard OV cartridges?
A: Iodinated carbon cartridges typically have a shorter shelf life (often 2-3 years) versus standard activated carbon OV cartridges (typically 5 years). Iodine volatilizes over time from the carbon matrix, reducing mercury adsorption capacity. Check the expiration date printed on each cartridge package and discard expired cartridges — never use out-of-date mercury cartridges.
Q: Does the 75852P100L protect against mercury in thermometers and pressure gauges?
A: Yes — if mercury liquid is spilled from thermometers or pressure instruments, the volatile elemental mercury vapor is the inhalation hazard. The 75852P100L is appropriate for cleanup of mercury spills from instruments. Follow EPA guidance for mercury spill cleanup and avoid disturbing mercury in ways that increase vapor generation (no vacuum cleaners on mercury spills).
Q: What industries require the 75852P100L specifically?
A: Primary industries: dental offices (amalgam removal), chlor-alkali plants (mercury cell process), artisanal gold mining, scientific instrument manufacturing, fluorescent lamp recycling facilities, certain laboratory applications, thermometer calibration labs. Any facility where elemental mercury vapor exposure is a documented hazard.
Browse and Compare on WC Safety
- Browse All Respirators & Respiratory Protection on WCSafety.com
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Disclosures & editorial standards
WC Safety participates in the Amazon Services LLC Associates Program. Outbound Amazon links are affiliate links. We accept no manufacturer payment, sponsorship, or product samples. This content is not medical, legal, or regulatory advice. Safety equipment selection is governed by applicable OSHA standards and your facility's safety program.
WC Safety participates in the Amazon Services LLC Associates Program. Outbound Amazon links are affiliate links. We accept no manufacturer payment, sponsorship, or product samples. This content is not medical, legal, or regulatory advice. Safety equipment selection is governed by applicable OSHA standards and your facility's safety program.
Pros & Cons
Pros
- The only NIOSH-approved Honeywell North cartridge for elemental mercury (Hg) vapor — no in-line substitute exists
- Iodinated activated carbon chemisorbs mercury vapor into solid mercury iodide rather than relying on weak physical adsorption
- Adds chlorine (Cl₂) gas coverage, ideal for mercury-cell chlor-alkali plants where both hazards co-occur
- Integral P100 stage captures amalgam dust and mercury-bearing particulate at 99.97% with no separate filter or 501-style retainer needed
- Snaps onto the standard Honeywell North bayonet, fitting both 5500-series half-face and 7600/5400-series full-face facepieces
- Sold as a matched pair, so both bayonet ports are covered in one purchase
Cons
- Single-purpose: rated for elemental mercury vapor and chlorine only — not organic vapors, ammonia, or acid-gas blends
- Not approved for organic mercury compounds such as methylmercury or dimethylmercury
- Iodinated carbon ages faster than plain OV carbon, so shelf life and storage discipline matter more
- Honeywell North bayonet is not cross-compatible with 3M or Moldex facepieces
- Mercury's poor warning properties (no reliable odor at low levels) force a strictly time/IH-data-based change schedule rather than relying on breakthrough sensing
Who It's For
Buy it if:
- Dental practices managing mercury vapor released during amalgam placement, removal, and polishing
- Mercury-cell chlor-alkali plant workers facing simultaneous Hg vapor and Cl₂ exposure
- Artisanal and small-scale gold operations using mercury amalgamation
- Thermometer, gauge, and scientific-instrument facilities handling liquid mercury
- Safety managers standardized on Honeywell North bayonet facepieces who need a compliant mercury option
Look elsewhere if:
- Workers whose primary hazard is organic vapor, acid gas, or ammonia — a different North cartridge applies
- Anyone exposed to organic mercury compounds, which need an industrial-hygienist-directed approach
- Users on 3M or Moldex facepieces, since the North bayonet will not mount
Related Resources
- moldex respirator cartridges and filters
- respiratory protection
- how to choose a respirator cartridge
- respirator cartridge esli guide
- respiratory protection complete guide
- honeywell north 7580p100
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- honeywell north 7581p100l
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- honeywell north 75852p100l
Common questions
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
Related on this site: how to choose a respirator cartridge: complete selection guide, best honeywell north cartridge for mercury vapor, honeywell north 7583p100l vs 3m 60923: organic vapor, acid gas & p100, honeywell north n75002l vs 7582p100l: acid gas vs acid gas/p100 — when, best honeywell north cartridge for chlorine, and best respirator cartridge for mercury vapor.
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.
Affiliate disclosure: as an Amazon Associate, WC Safety earns from qualifying purchases. WC Safety is not a retailer and takes no orders — links go to the seller, and the price you pay is unchanged.
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