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Industrial Safety Equipment & PPE — ANSI/OSHA Compliant
Industrial Safety Equipment & PPE — ANSI/OSHA Compliant
May 12, 2026 Updated July 25, 2026 Steven Eaton

Honeywell North 75852P100L Mercury Vapor + Chlorine P100 Review: The Only North Mercury Cartridge

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?

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.

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Specifications

Feature Details
Model 75852P100L
Mercury Protection Mercury vapor (Hg) — iodinated carbon sorbent
Chlorine Protection Clâ‚‚ (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 Clâ‚‚
  • 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
  • Immediate replacement when the wearer detects any odor, taste, or irritation through the cartridge — this indicates breakthrough and potential saturation
  • 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.

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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.

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 (Clâ‚‚) 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 Clâ‚‚ 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

Frequently Asked Questions

Is the 75852P100L worth its price premium over a standard North OV/P100 cartridge?

For a mercury hazard, yes — price is essentially irrelevant because there is no cheaper North cartridge that is NIOSH-approved for mercury vapor. The iodinated-carbon chemistry and the chlorine approval justify the higher cost relative to a plain organic-vapor cartridge like the honeywell north 7581p100l. If you do not have a mercury or chlorine hazard, the premium is wasted and a general-purpose cartridge is the better value.

How does the 75852P100L compare to the multi-gas 75SCP100L?

The honeywell north 75scp100l is a broad multi-gas/P100 cartridge covering several organic-vapor and acid-gas categories, but it is not approved for elemental mercury. The 75852P100L is the narrower, mercury-specific tool. Choose the 75SCP100L for mixed organic and acid-gas environments; choose the 75852P100L only when mercury vapor (or mercury plus chlorine) is the defining hazard.

Should I pick the 75852P100L or the 7583P100L for an acid-gas job?

For acid gases without mercury, the honeywell north 7583p100l or the OV/acid-gas-class options are the correct, more economical fit. The 75852P100L only happens to include chlorine because chlor-alkali plants pair it with mercury — do not buy it as a general acid-gas cartridge when a purpose-built one costs less and lasts longer.

Is P100 the right particulate level for amalgam dust, or would P95 do?

P100 (99.97%) is the appropriate and only level offered here, and it is the right call for mercury-bearing amalgam particulate. Because mercury has such a low exposure limit, you want the highest particulate efficiency rather than settling for a P95. The integral P100 stage also handles fine dental dust without a separate filter.

Do I get meaningfully more protection by running this on a full-face North facepiece?

Yes. On a half-face North facepiece the assigned protection factor is 10, which covers mercury up to about 1 mg/m³; on a full-face the APF of 50 covers up to roughly 5 mg/m³. For higher airborne mercury, or where eye irritation from chlorine is a concern, the full-face 7600/5400-series pairing is the stronger choice. Confirm selection through the respiratory protection complete guide.

How should I set a change-out schedule when mercury has poor warning properties?

Because mercury vapor gives no reliable odor warning at low concentrations, you cannot rely on smell or taste to time replacement. Build a strictly time-based schedule from your industrial-hygiene exposure data under OSHA 1910.134, and replace on the most conservative interval. The respirator cartridge esli guide explains why end-of-service-life planning matters most for exactly this kind of low-warning sorbent.

Does the 75852P100L have an end-of-service-life indicator?

No mercury cartridge should be treated as if odor or taste is a dependable ESLI. Manage it on a documented time/concentration schedule rather than waiting for any sensory cue. Our respirator cartridge esli guide covers how to handle cartridges whose breakthrough cannot be sensed by the wearer.

How many pairs should a dental office or plant keep in stock?

Stock enough pairs to cover your scheduled change-out frequency for every respirator-wearing employee, plus a margin for spoiled or contaminated cartridges. Because iodinated carbon ages faster than plain OV carbon, avoid over-buying a multi-year supply that will expire on the shelf. Match purchase volume to realistic turnover and your written respiratory-protection program.

Is this cartridge a good fit for an artisanal gold-mining operation?

It is the correct sorbent for the mercury-vapor side of amalgamation and burning, and it captures mercury-bearing particulate via the P100 stage. However, respirators are the last line of defense — engineering controls and retorts should reduce vapor first. Use the 75852P100L within a complete program rather than as a substitute for ventilation.

Can I mix the 75852P100L on one side and a different North cartridge on the other?

No. NIOSH approvals require a matched pair of identical cartridges, and the 75852P100L is sold as a pair for that reason. Running a mercury cartridge on one port and an OV cartridge on the other voids the approval and leaves a protection gap. Always pair like with like.

How does this compare to the 7582P100L for my facility?

The honeywell north 7582p100l is a multi-contaminant organic-vapor/acid-gas cartridge with no mercury approval. If your hazard inventory includes elemental mercury, the 7582P100L cannot legally cover it and you must use the 75852P100L. If mercury is absent, the 7582P100L is the broader, lower-cost option.

Is the 75852P100L overkill if I only have a chlorine hazard?

Yes. For a chlorine-only exposure, a dedicated acid-gas cartridge is more economical and longer-lived. The 75852P100L's value is in covering mercury and chlorine together, which is the specific reality of mercury-cell chlor-alkali work — buying it solely for chlorine wastes the mercury chemistry you are paying for.

Where does the 75852P100L sit relative to the rest of the North cartridge family?

It is the specialty endpoint of the lineup. General-purpose options like the honeywell north 7580p100 and combination cartridges such as the honeywell north 7584p100l handle most organic-vapor and acid-gas jobs, while the 75852P100L exists purely to fill the mercury gap none of the others can. Browse the full respiratory protection range to map your hazards to the right part.

How do I confirm this is the right cartridge before committing to a facility-wide order?

Start from a written hazard assessment, match each airborne contaminant to a NIOSH approval, and verify mercury is genuinely present before standardizing on the 75852P100L. Walking through the how to choose a respirator cartridge framework prevents the costly mistake of buying a mercury-specific part for a non-mercury job — or worse, the reverse.

If my team uses Moldex facepieces, can I still standardize on this cartridge?

No. The 75852P100L uses the Honeywell North bayonet and will not mount on Moldex or 3M facepieces. If you are committed to another platform you would need that brand's equivalent — and for Moldex users there is a separate moldex respirator cartridges and filters range, though confirm mercury approval there independently rather than assuming parity.

Why trust WC Safety
Industrial PPE specialists. We do not accept manufacturer payment for placement.
Reviewed by
Steven Eaton, WC Safety Editorial — guidance reflects current OSHA, NIOSH and ANSI practice.
Our standards
Ratings combine published specs, hands-on familiarity, and verified customer data where available; we do not fabricate lab tests.
Affiliate disclosure
Some links are Amazon affiliate links (tag wcsafety04-20); purchases may earn us a commission at no cost to you.
Filed in: 75852P100L, chlor-alkali, chlorine, dental, gold mining, honeywell north, mercury vapor, NIOSH, P100, product review, respirator cartridges
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