Home Categories Flavors and fragrances 1-Butanethiol
A1227812

1-Butanethiol , standardforGC,≥99%(GC) , 109-79-5

Synonym(s):
1-Butanethiol;Butyl mercaptan;Mercaptan C4

CAS NO.:109-79-5

Empirical Formula: C4H10S

Molecular Weight: 90.19

MDL number: MFCD00004905

EINECS: 203-705-3

Update time: 2022-07-08

PRODUCT Properties

Melting point: −116 °C(lit.)
Boiling point: 98 °C(lit.)
Density  0.842 g/mL at 25 °C(lit.)
vapor density  3.1 (vs air)
vapor pressure  83 mm Hg ( 37.7 °C)
refractive index  n20/D 1.443(lit.)
FEMA  3478 | 1-BUTANETHIOL
Flash point: 55 °F
storage temp.  Store below +30°C.
solubility  Slightly soluble in water, soluble in alcohol and oils.
pka 11.51 at 25 °C (23.0% aqueous tert-butyl alcohol, Friedman et al., 1965)
form  Liquid
color  Colorless
Specific Gravity 0.842
Odor Strong skunk-like.
explosive limit 1.4-11.3%(V)
Odor Threshold 0.0000028ppm
Odor Type sulfurous
Water Solubility  0.60 g/100 mL. Slightly soluble
Sensitive  Air Sensitive
Merck  14,1577
JECFA Number 511
BRN  1730908
Henry's Law Constant (x 10-3 atm?m3/mol): 7.04 at 20 °C (approximate - calculated from water solubility and vapor pressure)
Exposure limits NIOSH REL: 15-min ceiling 0.5 ppm (1.8 mg/m3), IDLH 500 ppm; OSHA PEL: TWA 10 ppm (35 mg/m3); ACGIH TLV: TWA 0.5 ppm (adopted).
Dielectric constant 4.9500000000000002
Stability: Stable. Incompatible with oxidizing agents, bases, alkali metals. Highly flammable. May discolour on exposure to air.
LogP 2.28

Description and Uses

Butane thiol, also known as butyl mercaptan, is a volatile, clear to yellowish liquid with a fetid (extremely foul-smelling) odor, commonly described as "skunk" odor. In fact, butanethiol is structurally similar to several major constituents of a skunk's defensive spray but is not actually present in the spray. The scent of butanethiol is so strong that the human nose can easily detect it in the air at concentrations as low as 10 parts per billion. The threshold level for 1-butane thiol is reported as 1.4 ppb.

Intermediate, solvent.

Safety

Symbol(GHS) 
GHS02,GHS07
Signal word  Danger
Hazard statements  H225-H302+H332-H315-H317-H319-H335
Precautionary statements  P210-P280-P301+P312-P303+P361+P353-P304+P340+P312-P305+P351+P338
Hazard Codes  F,Xn
Risk Statements  11-20/22-36/37/38-21/22-43
Safety Statements  16-23-26-36-9-36/37-33-37-37/39
RIDADR  UN 2347 3/PG 2
OEL Ceiling: 0.5 ppm (1.8 mg/m3) [15-minute]
WGK Germany  3
RTECS  EK6300000
10-13-23
TSCA  Yes
HS Code  2930 90 98
HazardClass  3
PackingGroup  II
Toxicity LD50 orally in Rabbit: 1500 mg/kg
IDLA 500 ppm

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