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n-Butyl mercaptan

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Synonyms & Trade Names
Butanethiol, 1-Butanethiol, n-Butanethiol, 1-Mercaptobutane
CAS No.
109-79-5
RTECS No.
EK6300000
DOT ID & Guide
2347 130
Formula
CH₃CH₂CH₂CH₂SH
Conversion
1 ppm = 3.69 mg/m3
IDLH
500 ppm
See: 109795
Exposure Limits
NIOSH REL
C 0.5 ppm (1.8 mg/m3) [15-minute]
OSHA PEL
TWA 10 ppm (35 mg/m3) See Appendix G
Measurement Methods
NIOSH 2525 , 2542
See: NMAM or OSHA Methods
Physical Description
Colorless liquid with a strong, garlic-, cabbage-, or skunk-like odor.
Molecular Weight
90.2
Boiling Point
209°F
Freezing Point
-176°F
Solubility
0.06%
Vapor Pressure
35 mmHg
Ionization Potential
9.15 eV
Specific Gravity
0.83
Flash Point
35°F
Upper Explosive Limit
?
Lower Explosive Limit
?
Class IB Flammable Liquid: Fl.P. below 73°F and BP at or above 100°F.
Incompatibilities & Reactivities
Strong oxidizers (such as dry bleaches), acids
Exposure Routes
inhalation, ingestion, skin and/or eye contact
Symptoms
irritation eyes, skin; muscle weak, malaise (vague feeling of discomfort), sweating, nausea, vomiting, headache, confusion; In Animals: narcosis, incoordination, lassitude (weakness, exhaustion); cyanosis, pulmonary irritation; liver, kidney damage
Target Organs
Eyes, skin, respiratory system, central nervous system, liver, kidneys
Personal Protection/Sanitation
(See protection codes)
Skin:Prevent skin contact
Eyes:Prevent eye contact
Wash skin:When contaminated
Remove:When wet (flammable)
Change:No recommendation
First Aid
(See procedures)
Eye:Irrigate immediately
Skin:Soap wash promptly
Breathing:Respiratory support
Swallow:Medical attention immediately
Respirator Recommendations

NIOSH

Up to 5 ppm:
(APF = 10) Any chemical cartridge respirator with organic vapor cartridge(s)
(APF = 10) Any supplied-air respirator

Up to 12.5 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 25 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

Up to 500 ppm:
(APF = 1000) Any supplied-air respirator operated in a pressure-demand or other positive-pressure mode*

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: 0018   MEDICAL TESTS: 0033
Page last reviewed: October 30, 2019
Content source: National Institute for Occupational Safety and Health