# 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
Exposure Limits | 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 | UEL: NA | LEL: 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
See also: INTRODUCTION