# NIOSH Pocket Guide to Chemical Hazards
Benzenethiol | CAS 108-98-5
C6H5SH | RTECS DC0525000
Synonyms & Trade Names Mercaptobenzene, Phenyl mercaptan, Thiophenol | DOT ID & Guide 2337 131
Exposure Limits | NIOSH REL: C 0.1 ppm (0.5 mg/m3) [15-minute]
OSHA PEL†: none
IDLH N.D. | Conversion 1 ppm = 4.51 mg/m3
Physical Description Water-white liquid with an offensive, garlic-like odor. [Note: A solid below 5°F.]
MW: 110.2 | BP: 336°F | FRZ: 5°F | Sol(77°F): 0.08%
VP(65°F): 1 mmHg | IP: 8.33 eV |  | Sp.Gr: 1.08
Fl.P: 132°F | UEL: ? | LEL: ? |
Class II Combustible Liquid: Fl.P. at or above 100°F and below 140°F.
Incompatibilities & Reactivities Strong acids & bases, calcium hypochlorite, alkali metals [Note: Oxidizes on exposure to air.]
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: Soap wash immediately Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH Up to 1 ppm: (APF = 10) Any chemical cartridge respirator with organic vapor cartridge(s)/(APF = 10) Any supplied-air respirator Up to 2.5 ppm: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode/(APF = 25) Any powered, air-purifying respirator with organic vapor cartridge(s) Up to 5 ppm: (APF = 50) Any chemical cartridge respirator with a full facepiece and organic vapor cartridge(s)/(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister/(APF = 50) Any powered, air-purifying respirator with a tight-fitting facepiece and organic vapor cartridge(s)/(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 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, respiratory system; dermatitis; cyanosis; cough, wheezing, dyspnea (breathing difficulty), pulmonary edema, pneumonitis; headache, dizziness, central nervous system depression; nausea, vomiting; kidney, liver, spleen damage
Target Organs Eyes, skin, respiratory system, central nervous system, kidneys, liver, spleen
See also: INTRODUCTION