Isobutyl mercaptan

  • 1-Isobutanethiol
  • 2-Methyl-1-propanethiol
  • sobutyl thiol
Formula
C4H10S
Structure

Registry Numbers and Inventories.
CAS
513-44-0
EC (EINECS/ELINCS)
208-162-6
RTECS
TZ7630000
RTECS class
Primary Irritant
UN (DOT)
2347
Merck
12,5161
Beilstein/Gmelin
1730890
Beilstein Reference
4-01-00-01605
Swiss Giftliste 1
G-2525
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
C4H10S
Formula mass
90.18
Boiling point, °C
88
Vapor pressure, mmHg
74 (25 C)
Density
0.8338 g/cm3 (25 C)
Solubility in water
Slightly soluble
Refractive index
1.43859 (20 C)
pKa/pKb
10.47 (pKa)
Partition coefficient, pKow
2.13
Heat of fusion
5.0 kJ/mol
Heat of vaporization
31.0 kJ/mol

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear skin protection and self-contained breathing apparatus.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Make no contact with the spilled material. ELIMINATE all ignition sources and ground all equipment. Stop leak if you can do it without risk. A vapor suppressing foam may be used to reduce vapors. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. Use clean non-sparking tools to collect absorbed material.
Stability
Can react vigorously with oxidizing materials. Highly reactive.

Fire.
Flash Point,°C
-9
Lower exp. limit, %
1.4
Fire fighting
Use of water spray when fighting fire may be inefficient. Small Fires: Dry chemical, carbon dioxide, water spray or regular foam. Large Fires: Water spray, fog or regular foam. Do not use straight streams.
Fire potential
Moderate when exposed to heat or flame.
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 hazard indoors, outdoors or in sewers.
Combustion products
Fire will produce irritating, corrosive and/or toxic gases.

Health.
Poison_Class
-
Exposure effects
The toxological properties of this substance have not been fully investigated.
   Inhalation
Vapors may cause dizziness or suffocation. May cause toxic effects. May irritate or burn.
   Skin
May irritate or burn. May cause toxic effects if absorbed through the skin.
   Eyes
See Skin.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Administer oxygen if breathing is difficult.
   Skin
Remove and isolate contaminated clothing and shoes. In case of contact with substance, immediately flush with running water for at least 20 minutes. Wash skin with soap and water.
   Eyes
In case of contact with substance, immediately flush with running water for at least 20 minutes.

Transport.
UN number
2347
Response guide
Hazard class
3
Packing Group
II