# NIOSH Pocket Guide to Chemical Hazards
Sulfur monochloride | CAS 10025-67-9
S2Cl2 | RTECS WS4300000
Synonyms & Trade Names Sulfur chloride, Sulfur subchloride, Thiosulfurous dichloride | DOT ID & Guide 1828 137
Exposure Limits | NIOSH REL: C 1 ppm (6 mg/m3)
OSHA PEL†: TWA 1 ppm (6 mg/m3)
IDLH 5 ppm | Conversion 1 ppm = 5.52 mg/m3
Physical Description Light-amber to yellow-red, oily liquid with a pungent, nauseating, irritating odor.
MW: 135.0 | BP: 280°F | FRZ: -107°F | Sol: Decomposes
VP: 7 mmHg | IP: 9.40 eV |  | Sp.Gr: 1.68
Fl.P: 245°F | UEL: ? | LEL: ? |
Class IIIB Combustible Liquid: Fl.P. at or above 200°F.
Incompatibilities & Reactivities Peroxides, oxides of phosphorous, organics, water [Note: Decomposes violently in water to form hydrochloric acid, sulfur dioxide, sulfur, sulfite, thiosulfate, and hydrogen sulfide. Corrosive to metals.]
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 NIOSH/OSHA Up to 5 ppm: (APF = 50) Any chemical cartridge respirator with a full facepiece and cartridge(s) providing protection against the compound of concern/(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted canister providing protection against the compound of concern/(APF = 25) Any powered, air-purifying respirator with cartridge(s) providing protection against the compound of concern£/(APF = 50) Any self-contained breathing apparatus with a full facepiece/(APF = 50) Any supplied-air respirator with a full facepiece 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 canister providing protection against the compound of concern/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, mucous membrane; lacrimation (discharge of tears); cough; eye, skin burns; pulmonary edema
Target Organs Eyes, skin, respiratory system
See also: INTRODUCTION