NIOSH logo and tagline

Benzenethiol

Related Pages
Synonyms & Trade Names
Mercaptobenzene, Phenyl mercaptan, Thiophenol
CAS No.
108-98-5
RTECS No.
DC0525000
DOT ID & Guide
2337 131
Formula
C₆H₅SH
Conversion
1 ppm = 4.51 mg/m3
IDLH
N.D.
See: IDLH INDEX
Exposure Limits
NIOSH REL
C 0.1 ppm (0.5 mg/m3) [15-minute]
OSHA PEL
none See Appendix G
Measurement Methods
OSHA PV2075
See: NMAM or OSHA Methods
Physical Description
Water-white liquid with an offensive, garlic-like odor. [Note: A solid below 5°F.]
Molecular Weight
110.2
Boiling Point
336°F
Freezing Point
5°F
Solubility
(77°F): 0.08%
Vapor Pressure
(65°F): 1 mmHg
Ionization Potential
8.33 eV
Specific Gravity
1.08
Flash Point
132°F
Upper Explosive Limit
?
Lower Explosive Limit
?
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.]
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
Personal Protection/Sanitation
(See protection codes)
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

Important additional information about respirator selection

See also
INTRODUCTION   ICSC CARD: 0463
Page last reviewed: October 30, 2019
Content source: National Institute for Occupational Safety and Health