# NIOSH Pocket Guide to Chemical Hazards
1-Octadecanethiol | CAS 2885-00-9
CH3(CH2)17SH | RTECS
Synonyms & Trade Names 1-Mercaptooctadecane, Octadecyl mercaptan, Stearyl mercaptan | DOT ID & Guide 1228 131 (liquid)
Exposure Limits | NIOSH REL: C 0.5 ppm (5.9 mg/m3) [15-minute]
OSHA PEL: none
IDLH N.D. | Conversion 1 ppm = 11.72 mg/m3
Physical Description Solid or liquid (above 77°F).
MW: 286.6 | BP: ? | MLT: 77°F | Sol: Insoluble
VP: ? | IP: ? |  | Sp.Gr: 0.85
Fl.P: ? | UEL: ? | LEL: ? |
Combustible Solid Combustible Liquid
Incompatibilities & Reactivities Oxidizers, reducing agents, strong acids & bases, alkali metals
Measurement Methods None available
Personal Protection & Sanitation 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 canister/Any appropriate escape-type, self-contained breathing apparatus
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
See also: INTRODUCTION