NIOSH Pocket Guide to Chemical Hazards


CAS 126-98-7


RTECS UD1400000
Synonyms & Trade Names
2-Cyanopropene-1, 2-Cyano-1-propene, Isoprene cyanide, Isopropenylnitrile, Methacrylonitrile, alpha-Methylacrylonitrile, 2-Methylpropenenitrile
DOT ID & Guide
3079 131P (inhibited)


NIOSH REL: TWA 1 ppm (3 mg/m3) [skin]
OSHA PEL: none
IDLH N.D. See: IDLH INDEX Conversion 1 ppm = 2.74 mg/m3
Physical Description
Colorless liquid with an odor like bitter almonds.
MW: 67.1
BP: 195°F
FRZ: -32°F
Sol: 3%
VP(77°F): 71 mmHg
IP: ?

Sp.Gr: 0.80
Fl.P: 34°F
UEL: 6.8%
LEL: 2%

Class IB Flammable Liquid: Fl.P. below 73F and BP at or above 100F.
Incompatibilities & Reactivities
Strong acids, strong oxidizers, alkali, light [Note: Polymerization may occur due to elevated temperature, visible light, or contact with a concentrated alkali.]
Measurement Methods
None available
See: NMAM or OSHA Methods
Personal Protection & Sanitation (See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet (flammable)
Change: No recommendation

First Aid (See procedures)
Eye: Irrigate immediately
Skin: Soap wash immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
Important additional information about respirator selection
Respirator Recommendations Not available.
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin; lacrimation (discharge of tears); in animals: convulsions, loss of motor control in hind limbs
Target Organs Eyes, skin, central nervous system
See also: INTRODUCTION   See ICSC CARD: 0652