Isopentane

  • 2-Methylbutane
  • Ethyldimethylmethane
Formula
C5H12
Structure
Description
Clear, colorless to yellow liquid with a mild gasoline odor.
Uses
Solvent, manufacture of chlorinated derivatives, blowing agent for polystyrene.

Registry Numbers and Inventories.
CAS
78-78-4
EC (EINECS/ELINCS)
201-142-8
EC Index Number
601-006-00-1
EC Class
Extremely flammable; Harmful; Repeated exposure may cause skin dryness or cracking; Vapours may cause drowsiness and dizziness; Dangerous for the Environment
R 12 51/53 65 66 67
S 9 16 29 33 61 62
RTECS
EK4430000
RTECS class
Other
UN (DOT)
1265
Beilstein/Gmelin
1730723
Beilstein Reference
4-01-00-00329
Swiss Giftliste 1
G-4404
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C5H12
Formula mass
72.15
Melting point, °C
-160
Boiling point, °C
28
Vapor pressure, mmHg
727 (25 C)
Vapor density (air=1)
2.48
Saturation Concentration
0.8 % (21 C)
Evaporization number
1 (butyl acetate=1)
Odor Threshold Odor threshold 10 ppm
Critical temperature
187.8
Critical pressure
32.9
Density
0.620 g/cm3 (20 C)
Solubility in water
Insoluble
Viscosity
0.233 cp at 20C
Surface tension
13.72 g/s2 at 20 C
Refractive index
1.3537 (20C)
Dipole moment
0.29 D
Dielectric constant
1.84 (20 C)
Partition coefficient, pKow
2.30
Thermal expansion
0.001/K
Heat of fusion
5.1 kJ/mol
Heat of vaporization
26.1 kJ/mol
Heat of combustion
-3506 kJ/mol

Hazards and Protection.
Storage
Keep away from sources of ignition. Store in a tightly closed container. Store in a dry area. Refrigerator/flammables.
B2
Handling
Remove contaminated clothing and wash before reuse. Use spark-proof tools and explosion proof equipment. Do not get in eyes, on skin, or on clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Take precautionary measures against static discharges. Do not ingest or inhale. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.
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
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Avoid runoff into storm sewers and ditches which lead to waterways. Remove all sources of ignition. Provide ventilation.
Disposal code
1
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents.
Decomposition
Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.

Fire.
Flash Point,°C
-57
Autoignition, °C
420
Upper exp. limit, %
8.3
Lower exp. limit, %
1.4
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Extinguishing media: Use water spray to cool fire-exposed containers. Use foam, dry chemical, or carbon dioxide. Water may be ineffective.
Fire potential
Very flammable liquid. Highly dangerous when exposed to heat or flame or oxidizers.
Hazards
Highly volatile liquid. Vapors may explode when mixed with air. Vapors can travel to a source of ignition and flash back.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.
Health
1
 
Flammability
4
 
 
Reactivity
0
 

Health.
Exposure limit(s)
600 ppm ACGIH TWA
Poison_Class
5
Exposure effects
Mild central nervous system depression or excitation may occur after ingestion or vapor inhalation.
   Ingestion
Material is a gas so ingestion is an ulikely route of exposure. Ingestion of large amounts may lead to a gas embolism.
   Inhalation
May cause headache, nausea, vomiting dizziness, narcosis, suffocation, lower blood pressure, CNS depression.
   Skin
May cause skin irritation.
   Eyes
May cause eye irritation.

First aid
 
   Ingestion
Get medical aid immediately.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   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
1265
Response guide
Hazard class
3
Packing Group
I; II
 
USCG CHRIS Code
IPT
 
HS Code
2901 10 90
 
IMO Chemical Code
17
IMO Pollution Category
C
IMO Hazard code
P