n-Butyl mercaptan
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CAS
109-79-5
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CH3CH2CH2CH2SH
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RTECS
EK6300000
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Synonyms & Trade Names
Butanethiol, 1-Butanethiol, n-Butanethiol, 1-Mercaptobutane
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DOT ID & Guide
2347 / 130
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Exposure
Limits
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NIOSH REL: C 0.5 ppm (1.8 mg/m3) [15-minute]
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OSHA PEL†: TWA 10 ppm (35 mg/m3)
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IDLH
500 ppm
See: 109795
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Conversion
1 ppm = 3.69 mg/m3
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Physical Description
Colorless liquid with a strong, garlic-, cabbage-, or skunk-like odor.
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MW: 90.2
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BP: 209°F
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FRZ: -176°F
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Sol: 0.06%
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VP: 35 mmHg
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IP: 9.15 eV
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Sp.Gr: 0.83
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Fl.P: 35°F
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UEL: ?
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LEL: ?
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Class IB Flammable Liquid: Fl.P. below 73°F and BP at or above 100°F.
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Incompatibilities & Reactivities
Strong oxidizers (such as dry bleaches), acids
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Measurement Methods
NIOSH 2525, 2542
See: NMAM or OSHA Methods |
Personal Protection & Sanitation (See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet (flammable)
Change: No recommendation
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First Aid (See procedures)
Eye: Irrigate immediately
Skin: Soap wash promptly
Breathing: Respiratory support
Swallow: Medical attention immediately
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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
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Exposure Routes
inhalation, ingestion, skin and/or eye contact
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Symptoms
Irritation eyes, skin; muscle weakness, malaise (vague feeling of discomfort), sweating, nausea, vomiting, headache, confusion; in animals: narcosis, incoordination, lassitude (weakness, exhaustion); cyanosis, pulmonary irritation; liver, kidney damage
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Target Organs
Eyes, skin, respiratory system, central nervous system, liver, kidneys
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See also: INTRODUCTION
See ICSC CARD: 0018 See MEDICAL TESTS: 0033
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