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1-Octadecanethiol																				Related Pages
Synonyms & Trade Names
			1-Mercaptooctadecane, Octadecyl mercaptan, Stearyl mercaptan
CAS No.
			2885-00-9
	RTECS No.
	DOT ID & Guide
			1228 131(liquid)

FormulaCH3(CH2)17SH
	Conversion
			1 ppm = 11.72 mg/m3
	IDLH
			N.D.See: IDLH INDEX

Exposure Limits
			NIOSH RELC 0.5 ppm (5.9 mg/m3) [15-minute]
					OSHA PEL none
	Measurement Methods
			None available 
					
					See: NMAM or OSHA Methods
										
Physical Description
			Solid or liquid (above 77°F).													
										
Molecular Weight286.6	
	Boiling Point?
	Melting Point77°F
	SolubilityInsoluble
	Vapor Pressure?
	Ionization Potential?											
Specific Gravity0.85	
	Flash Point?
	Upper Explosive Limit?
	Lower Explosive Limit?
Combustible SolidCombustible Liquid
Incompatibilities & Reactivities
			Oxidizers, reducing agents, strong acids & bases, alkali metals
Exposure Routes
			inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms
			irritation eyes, skin, respiratory system; headache, dizziness, lassitude (weakness, exhaustion), cyanosis, nausea, convulsions
Target Organs
			Eyes, skin, respiratory system, central nervous system, blood
										
Personal Protection/Sanitation
			(See protection codes) **Skin:**Prevent skin contact
							**Eyes:**Prevent eye contact
							**Wash skin:**When contaminated
							**Remove:**When wet or contaminated
							**Change:**Daily
	First Aid
			(See procedures)**Eye:**Irrigate immediately
							**Skin:**Soap wash immediately
							**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**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: 1622

			
							

			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
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