beta-Chloroprene

CAS: 126-99-8

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RTECS: N/A

OSHA PEL (8-hr TWA) 25 ppm OSHA PEL: 25 ppm / 90 mg/m3

NIOSH REL 1 ppm NIOSH REL: Ca(C) 1 ppm [15-min]See Appendix A

IDLH Threshold 250 ppm Imm. Dangerous to Life/Health

Skin Hazard Notation No Dermal standard 29 CFR 1910

Interactive Engine

beta-Chloroprene Shift Exposure & PPE Compliance Calculator

Input your measured workplace air sample concentration and work shift schedule. The engine applies the Brief & Scala mathematical reduction model to determine legally defensible compliance.

Measured Air Concentration (ppm)

ppm

Work Schedule / Shift Duration

OSHA Compliance Determination Awaiting Sample Input

Adjusted PEL (Brief-Scala)

Hazard Ratio (HR)

Mandated APF Respirator

Enter an air sampling concentration above to evaluate whether your facility triggers the OSHA Action Level (0.5× PEL) or requires mandatory respiratory protection under 29 CFR 1910.134.

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Generates an instant 1-page OSHA 29 CFR 1910.1000 compliance record.

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NIOSH Respirator & Barrier Protection Specifications

Required Cartridge / Filter Acid Gas (Yellow/White)

Certified for concentrations within permissible limits.

Chemical Barrier Gloves Nitrile or Neoprene Chemical Barrier

Prevents transdermal permeation.

NIOSH Respiratory Protocol:

Mandatory NIOSH-approved Acid Gas (Yellow/White) required when airborne concentration exceeds action level under OSHA 29 CFR 1910.134.

Respirator Equipment Buy Acid Respirator

Dermal Barrier Chemical Barrier Gloves

B2B Industrial Supply Grainger Cartridge Catalog

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Frequently Asked Questions About beta-Chloroprene Exposure

What is the legal OSHA PEL for beta-Chloroprene?

Under OSHA 29 CFR 1910.1000 Table Z-1, the 8-hour Time-Weighted Average (TWA) Permissible Exposure Limit (PEL) for beta-Chloroprene (CAS 126-99-8) is 25 ppm. In addition, NIOSH recommends a Recommended Exposure Limit (REL) of 1 ppm.

How do extended 10-hour and 12-hour shifts affect beta-Chloroprene exposure limits?

Because OSHA PELs are formulated for 8-hour workdays, working 10-hour or 12-hour shifts reduces recovery time. Applying the standard Brief & Scala mathematical model reduces the allowable concentration by a Reduction Factor (RF = 0.700 for 10-hr, RF = 0.500 for 12-hr). For beta-Chloroprene, an 8-hr PEL of 25 ppm adjusts to half that value on a 12-hour shift.

What respirator and PPE is required when handling beta-Chloroprene?

When atmospheric concentrations exceed the permissible limit up to 10× PEL, OSHA 29 CFR 1910.134 mandates a half-mask elastomeric respirator equipped with Acid Gas (Yellow/White). For dermal exposure, Nitrile or Neoprene Chemical Barrier are recommended.

What is the IDLH threshold for beta-Chloroprene?

The Immediately Dangerous to Life or Health (IDLH) concentration established by NIOSH for beta-Chloroprene is 250 ppm. Any entry into atmospheres at or above this concentration requires positive-pressure supplied air or Self-Contained Breathing Apparatus (SCBA).

🔬 Related Chemicals Requiring Acid Gas (Yellow/White)

1,1,1,2-Tetrachloro-2,2-difluoroethane CAS 76-11-9 1,1,1-Trichloroethane; see Methyl chloroform CAS N/A 1,1,2,2-Tetrachloro-1,2-difluoroethane CAS 76-12-0 1,1,2,2-Tetrachloroethane CAS 79-34-5 1,1,2-Trichloro-1,2,2-trifluoroethane CAS 76-13-1 1,1,2-Trichloroethane CAS 79-00-5

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