NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

n-Butane

CAS
106-97-8

CH3CH2CH2CH3

RTECS
EJ4200000
Synonyms & Trade Names

normal-Butane, Butyl hydride, Diethyl, Methylethylmethane [Note: Also see specific listing for Isobutane.]
DOT ID & Guide
1011 / 115
1075 / 115

Exposure
Limits

NIOSH REL: TWA 800 ppm (1900 mg/m3)
OSHA PEL: none
IDLH
N.D. See: IDLH INDEX
Conversion
1 ppm = 2.38 mg/m3
Physical Description
Colorless gas with a gasoline-like or natural gas odor. [Note: Shipped as a liquefied compressed gas. A liquid below 31°F.]
MW: 58.1
BP: 31°F
FRZ: -217°F
Sol: Slight
VP: 2.05 atm
IP: 10.63 eV
RGasD: 2.11
Sp.Gr: 0.6 (Liquid at 31°F)
Fl.P: NA (Gas)
UEL: 8.4%
LEL: 1.6%

Flammable Gas
Incompatibilities & Reactivities

Strong oxidizers (e.g., nitrates & perchlorates), chlorine, fluorine, (nickel carbonyl + oxygen)
Measurement Methods
OSHA PV2010
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
Skin: Frostbite
Eyes: Frostbite
Wash skin: No recommendation
Remove: When wet (flammable)
Change: No recommendation
Provide: Frostbite wash
First Aid
(See procedures)
Eye: Frostbite
Skin: Frostbite
Breathing: Respiratory support

Respirator Recommendations
Not available.
Important additional information about respirator selection
Exposure Routes
inhalation, skin and/or eye contact (liquid)
Symptoms
Drowsiness, narcosis, asphyxia; liquid: frostbite
Target Organs
central nervous system
See also: INTRODUCTION   See ICSC CARD: 0232