1-Octadecanethiol

Synonyms & Trade Names

1-Mercaptooctadecane, Octadecyl mercaptan, Stearyl mercaptan

CAS No.

2885-00-9

RTECS No.

DOT ID & Guide

1228 131(liquid)

Formula

CH₃(CH₂)₁₇SH

Conversion

1 ppm = 11.72 mg/m³

IDLH

N.D.
See: IDLH INDEX

Exposure Limits

NIOSH REL

C 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 Weight

286.6

Boiling Point

Melting Point

77°F

Solubility

Insoluble

Vapor Pressure

Ionization Potential

Specific Gravity

0.85

Flash Point

Upper Explosive Limit

Lower Explosive Limit

Combustible Solid
Combustible 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 canister
Any appropriate escape-type, self-contained breathing apparatus

Important additional information about respirator selection

1-Octadecanethiol

NIOSH REL

OSHA PEL

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