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n-Butyl mercaptan																				Related Pages
Synonyms & Trade Names
			Butanethiol, 1-Butanethiol, n-Butanethiol, 1-Mercaptobutane
CAS No.
			109-79-5
	RTECS No.
			EK6300000
	DOT ID & Guide
			2347 130

FormulaCH3CH2CH2CH2SH
	Conversion
			1 ppm = 3.69 mg/m3
	IDLH
			500 ppmSee: 109795

Exposure Limits
			NIOSH RELC 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 Weight90.2	
	Boiling Point209°F
	Freezing Point-176°F
	Solubility0.06%
	Vapor Pressure35 mmHg
	Ionization Potential9.15 eV											
Specific Gravity0.83	
	Flash Point35°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 canisterAny 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 NIOSH Pocket Guide to Chemical Hazards
Introduction
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Appendices
A – NIOSH Potential Occupational Carcinogens
B – Thirteen OSHA-Regulated Carcinogens
C – Supplementary Exposure Limits
D – Substances with No Established RELs
E – OSHA Respirator Requirements for Selected Chemicals
F – Miscellaneous Notes
G – 1989 Air Contaminants Update Project: Exposure Limits NOT in Effect
Type C & CE – Definitions for Type C and Type CE Respirators
Personal Protection and Sanitation Codes
First Aid Procedures Follow NIOSH Facebook
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