# NIOSH Pocket Guide to Chemical Hazards
Methylacrylonitrile | CAS 126-98-7
CH2=C(CH3)CN | 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)
Exposure Limits | NIOSH REL: TWA 1 ppm (3 mg/m3) [skin]
OSHA PEL†: none
IDLH N.D. | 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 73°F and BP at or above 100°F.
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
Personal Protection & Sanitation 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
Respirator Recommendations To be added later
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