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n-Butane Structure

n-Butane

Chemical Properties

Melting point −138 °C(lit.)
Boiling point −0.5 °C(lit.)
Density  0.579 g/mL at 20 °C(lit.)
vapor density  2.11 (vs air)
vapor pressure  3.21, 1.26, and 0.66 mM at 4, 25, and 50 °C, respectively (Kresheck et al., 1965)
refractive index  1.3326
Flash point 45
form  gas
Odor faint disagreeable odor
Odor Threshold 1200ppm
Water Solubility  73.24mg/L(25 ºC)
Merck  1515
BRN  969129
Henry's Law Constant (atm?m3/mol): 0.356 at 5 °C, 0.454 at 10 °C, 0.568 at 15 °C, 0.695 at 20 °C, 0.835 at 25 °C (Ben-Naim et al., 1973)
Exposure limits TLV-TWA 800 ppm (~1920 mg/m3) (ACGIH), 500 ppm (1200 mg/m3) (MSHA).
Dielectric constant 1.4(-1℃)
Stability Stable. Extremely flammable. Readily forms explosive mixtures with air. Note low flash point. Incompatible with strong oxidizing agents, strong acids, strong alkalies.
LogP 2.890
CAS DataBase Reference 106-97-8(CAS DataBase Reference)
EPA Substance Registry System Butane (106-97-8)

Safety Information

Hazard Codes  F+,F,T
Risk Statements  12-46-45
Safety Statements  9-16-45-53
RIDADR  UN 2037 2.1
WGK Germany  -
RTECS  EJ4200000
4.5-31
Hazard Note  Extremely Flammable
DOT Classification 2.1 (Flammable gas)
HazardClass  2.1
HS Code  2901100000
Hazardous Substances Data 106-97-8(Hazardous Substances Data)
Toxicity LC50 (inhalation) for mice 680 gm/m3/2-h, rats 658 gm/m3/4-h (quoted, RTECS, 1985).
IDLA 1,600 ppm (>10% LEL)

MSDS

Usage And Synthesis

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