# NIOSH Pocket Guide to Chemical Hazards
Malononitrile | CAS 109-77-3
NCCH2CN | RTECS OO3150000
Synonyms & Trade Names Cyanoacetonitrile, Dicyanomethane, Malonic dinitrile | DOT ID & Guide 2647 153
Exposure Limits | NIOSH REL: TWA 3 ppm (8 mg/m3)
OSHA PEL: none
IDLH N.D. | Conversion 1 ppm = 2.70 mg/m3
Physical Description White powder or colorless crystals. [Note: Melts above 90°F. Forms cyanide in the body.]
MW: 66.1 | BP: 426°F | MLT: 90°F | Sol: 13%
VP: ? | IP: 12.88 eV |  | Sp.Gr: 1.19
Fl.P(oc): 266°F | UEL: ? | LEL: ? |
Combustible Solid
Incompatibilities & Reactivities Strong bases [Note: May polymerize violently on prolonged heating at 265°F, or in contact with strong bases at lower temperatures.]
Measurement Methods NIOSH Nitriles Crit. Doc.
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet or contaminated Change: Daily Provide: Eyewash, Quick drench | First Aid (See procedures) Eye: Irrigate immediately Skin: Water wash immediately Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH Up to 80 mg/m3: (APF = 10) Any supplied-air respirator Up to 200 mg/m3: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode Up to 400 mg/m3: (APF = 50) Any self-contained breathing apparatus with a full facepiece/(APF = 50) Any supplied-air respirator with a full facepiece Up to 667 mg/m3: (APF = 2000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode Emergency or planned entry into unknown concentrations or IDLH conditions: (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 canister/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, nose, throat; headache, dizziness, lassitude (weakness, exhaustion), confusion, convulsions; dyspnea (breathing difficulty); abdominal pain, nausea, vomiting
Target Organs Eyes, skin, respiratory system, central nervous system, cardiovascular system
See also: INTRODUCTION