Label abbreviations descriptions

β-CHLOROPRENE (2-CHLORO-1,3-BUTADIENE)†

Chemical Identification
CAS # 126-99-8
Formula

C₄H₅Cl
Synonyms

2-chloro-1,3-butadiene; chlorobutadiene; chloroprene

Physical Properties
Physical description Colorless liquid with a pungent, ether-like odor.
Boiling point 139°F Molecular weight 88.5
Freezing point/melting point -153°F Vapor pressure 188 mmHg
Flash point -4°F Vapor density
Specific gravity 0.96 Ionization potential 8.79 eV
Lower explosive limit (LEL) 4.0% Upper explosive limit (UEL) 20.0%
NFPA health rating 2 NFPA fire rating 3
NFPA reactivity rating 1 NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs

Monitoring Methods Used by OSHA
Analyte code (IMIS no.) 0680
Sampling group
Sampler/Sampling media Chromosorb® 106 (600/300 mg) [SKC 226-111A]
Sampling time*

120 min
Sampling volume (TWA)*

6 L
Sampling flow rate (TWA)*

0.05 L/min
Sampling volume (STEL/Peak/C)*

1.5 L
Sampling flow rate (STEL/Peak/C)*

0.1 L/min
Analytical method instruments GC-ECD
Method reference OSHA 112 (fully validated)
Notes
Special requirements

* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Bulk/Wipe Method
Wipe Sampler/Sampling media

Wipe with charcoal pad, seal in glass vial for shipment. [3M 3500]
Bulk Method

On-Site Screening Techniques
Device
Model/Type
Sampling information
(see manufacturer instructions)

Exposure Limits
OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
NIOSH REL
Up to 10-hour TWA
(ST) STEL
(C) Ceiling
ACGIH TLV©
8-hour TWA
(ST) STEL
(C) Ceiling
CAL/OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
PEL-TWA

25 ppm (90 mg/m³)

 REL-TWA TLV-TWA PEL-TWA

10 ppm (36 mg/m³)
PEL-STEL REL-STEL TLV-STEL PEL-STEL
PEL-C REL-C

1 ppm (3.6 mg/m³) [15 minute]

 TLV-C PEL-C
Skin notation

Y

 Skin notation

N

 Skin notation

Y

 Skin notation

NA
Notes:

See 29 CFR 1910.1000 Table Z-1.

 Notes:

CARCINOGEN (Ca); See Appendix A

 Notes:

Visit the ACGIH TLV site for specific data

 Notes:
Health factors:  See NIH-NLM PubChem. IDLH

300 ppm
Carcinogenic classifications: EPA-L, IARC-2B, NIOSH-Ca, NTP-R; TLV-A2 Notes:

Ca
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:

Additional Resources and Literature References

Last Updated Date : 04/30/2024