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beta-Chloroprene																				Related Pages
Synonyms & Trade Names
			Chlorobutadiene, 2-Chloro-1,3-butadiene, Chloroprene
CAS No.
			126-99-8
	RTECS No.
			EI9625000
	DOT ID & Guide
			1991 131P(inhibited)

FormulaCH2=CClCH=CH2
	Conversion
			1 ppm = 3.62 mg/m3
	IDLH
			Ca [300 ppm]See: 126998

Exposure Limits
			NIOSH RELCa C 1 ppm (3.6 mg/m3) [15-minute] See Appendix A
					OSHA PEL TWA 25 ppm (90 mg/m3) [skin] See Appendix G
	Measurement Methods
			**NIOSH** 1002;**OSHA** 112
					
					See: NMAM or OSHA Methods
										
Physical Description
			Colorless liquid with a pungent, ether-like odor.													
										
Molecular Weight88.5	
	Boiling Point139°F
	Freezing Point-153°F
	SolubilitySlight
	Vapor Pressure188 mmHg
	Ionization Potential8.79 eV											
Specific Gravity0.96	
	Flash Point-4°F
	Upper Explosive Limit11.3%
	Lower Explosive Limit1.9%
Class IB Flammable Liquid: Fl.P. below 73°F and BP at or above 100°F.
Incompatibilities & Reactivities
			Peroxides & other oxidizers
					[Note: Polymerizes at room temperature unless inhibited with antioxidants.]
Exposure Routes
			inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms
			irritation eyes, skin, respiratory system; anxiety, irritability; dermatitis; alopecia; reproductive effects; [potential occupational carcinogen]
Target Organs
			Eyes, skin, respiratory system, reproductive system
Cancer Site[lung & skin cancer]										
Personal Protection/Sanitation
			(See protection codes) **Skin:**Prevent skin contact
							**Eyes:**Prevent eye contact
							**Wash skin:**When contaminated
							**Remove:**When wet (flammable)
							**Change:**No recommendation
							**Provide:**Eyewash, Quick drench
	First Aid
			(See procedures)**Eye:**Irrigate immediately
							**Skin:**Soap wash immediately
							**Breathing:**Respiratory support
							**Swallow:**Medical attention immediately
Respirator Recommendations
			**NIOSH****At concentrations above the NIOSH REL, or where there is no REL, at any detectable concentration:** (APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus**Escape:** (APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canisterAny appropriate escape-type, self-contained breathing apparatus
				Important additional information about respirator selection
See also
			INTRODUCTION
					  ICSC CARD: 0133
					  MEDICAL TESTS: 0050

			
							

			Page last reviewed:  October 30, 2019						Content
							source: 	National Institute for Occupational Safety and Health NIOSH Pocket Guide to Chemical Hazards
Introduction
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Chemical Names, Synonyms and Trade Names
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
CAS Numbers
RTECS Numbers
Appendices
A – NIOSH Potential Occupational Carcinogens
B – Thirteen OSHA-Regulated Carcinogens
C – Supplementary Exposure Limits
D – Substances with No Established RELs
E – OSHA Respirator Requirements for Selected Chemicals
F – Miscellaneous Notes
G – 1989 Air Contaminants Update Project: Exposure Limits NOT in Effect
Type C & CE – Definitions for Type C and Type CE Respirators
Personal Protection and Sanitation Codes
First Aid Procedures Follow NIOSH Facebook
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