NIOSH Pocket Guide to Chemical Hazards

Thionyl chloride CAS 7719-09-7
SOCl2 RTECS XM5150000
Synonyms & Trade Names
Sulfinyl chloride, Sulfur chloride oxide, Sulfurous dichloride, Sulfurous oxychloride, Thionyl dichloride
DOT ID & Guide
1836 137
NIOSH REL: C 1 ppm (5 mg/m3)
OSHA PEL†: none
IDLH N.D. Conversion 1 ppm = 4.87 mg/m3
Physical Description
Colorless to yellow to reddish liquid with a pungent odor like sulfur dioxide. [Note: Fumes form when exposed to moist air.]
MW: 119.0
BP: 169°F
FRZ: -156°F
Sol: Reacts
VP(70°F): 100 mmHg
IP: ?

Sp.Gr: 1.64
Fl.P: NA

Noncombustible Liquid
Incompatibilities & Reactivities
Water, acids, alkalis, ammonia, chloryl perchlorate [Note: Reacts violently with water to form sulfur dioxide & hydrogen chloride.]
Measurement Methods
None available
Personal Protection & Sanitation
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: No recommendation
Provide: Eyewash, Quick drench
First Aid (See procedures)
Eye: Irrigate immediately
Skin: Water flush immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations To be added later
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, mucous membrane; eye, skin burns
Target Organs Eyes, skin, respiratory system