1-Octadecanethiol

  • 1-Mercaptooctadecane
  • Octadecyl mercaptan
  • Stearyl mercaptan
  • Octadecane-1-thiol
Formula
CH3-(CH2)16-CH2-SH
Structure
Description
White powder, disagreeable, offensive odor.
Uses
Used as a polymerization conditioner. Used in chemical organic synthesis and tarnish-preventing agents.

Registry Numbers and Inventories.
CAS
2885-00-9
EC (EINECS/ELINCS)
220-744-1
EC Class
irritant
R 36/37/38
UN (DOT)
1228
Beilstein/Gmelin
1811934
Beilstein Reference
4-01-00-01894
Swiss Giftliste 1
G-4519
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C18H38S
Formula mass
286.57
Melting point, °C
28 - 31
Boiling point, °C
204
Vapor pressure, mmHg
3.8 (20 C)
Vapor density (air=1)
9.88
Density
0.8475 g/cm3 (20 C)
Solubility in water
Insoluble
Refractive index
1.4645 (20 C)

Hazards and Protection.
Storage
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
Insufficient information
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Clean up spills immediately, using the appropriate protective equipment. Sweep up or absorb material, then place into a suitable clean, dry, closed container for disposal. Avoid generating dusty conditions. Provide ventilation.
Disposal code
6
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Oxidizing agents.
Decomposition
Carbon monoxide, oxides of sulfur, carbon dioxide, hydrogen sulfide.

Fire.
Flash Point,°C
>150
Autoignition, °C
> 200
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. To extinguish fire use water spray, dry chemical, carbon dioxide, or appropriate foam.
Fire potential
HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
Hazards
Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion and poison hazard indoors, outdoors or in sewers.
Combustion products
During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion.

Health.
Exposure limit(s)
NIOSH REL: C 0.5 ppm (5.9 mg/m3) [15-minute]
Poison_Class
4
Exposure effects
   Ingestion
May cause digestive tract disturbances. The toxicological properties of this substance have not been fully investigated.
   Inhalation
May cause respiratory tract irritation. The toxicological properties of this substance have not been fully investigated.
   Skin
May cause skin irritation. The toxicological properties of this material have not been fully investigated.
   Eyes
May cause eye irritation. The toxicological properties of this material have not been fully investigated.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Transport.
UN number
1228
Response guide
Hazard class
3
Packing Group
II; III
 
HS Code
2930 90 70