NIOSH Pocket Guide to Chemical Hazards

Cyanogen chloride CAS 506-77-4
ClCN RTECS GT2275000
Synonyms & Trade Names
Chlorcyan, Chlorine cyanide, Chlorocyanide, Chlorocyanogen
DOT ID & Guide
1589 125 (inhibited)
NIOSH REL: C 0.3 ppm (0.6 mg/m3)
OSHA PEL†: none
IDLH N.D. Conversion 1 ppm = 2.52 mg/m3
Physical Description
Colorless gas or liquid (below 55°F) with an irritating odor. [Note: Shipped as a liquefied gas. A solid below 20°F. Forms cyanide in the body.]
MW: 61.5
BP: 55°F
FRZ: 20°F
Sol: 7%
VP: 1010 mmHg
IP: 12.49 eV
RGasD: 2.16
Sp.Gr: 1.22 (Liquid at 32°F)
Fl.P: NA

Nonflammable Gas
Incompatibilities & Reactivities
Water, acids, alkalis, ammonia, alcohols [Note: Can react very slowly with water to form hydrogen cyanide. May be stabilized to prevent polymerization.]
Measurement Methods
None available
Personal Protection & Sanitation
Skin: Prevent skin contact (liquid)
Eyes: Prevent eye contact (liquid)
Wash skin: When contaminated (liquid)
Remove: When wet or contaminated (liquid)
Change: No recommendation
Provide: Eyewash (liquid), Quick drench (liquid)
First Aid (See procedures)
Eye: Irrigate immediately
Skin: Water wash immediately (liquid)
Breathing: Respiratory support
Swallow: Medical attention immediately (liquid)
Respirator Recommendations To be added later
Exposure Routes inhalation, skin absorption (liquid), ingestion (liquid), skin and/or eye contact (liquid)
Symptoms Irritation eyes, upper respiratory system; cough, delayed pulmonary edema; lassitude (weakness, exhaustion), headache, dizziness, confusion, nausea, vomiting; irregular heartbeat; irritation skin (liquid)
Target Organs Eyes, skin, respiratory system, central nervous system, cardiovascular system