BUTYL MERCAPTAN (BUTANETHIOL)†

Chemical Identification
Chemical Identification
CAS # 109-79-5
Formula

C₄H₁₀S

Synonyms

butanethiol; 1-butanethiol; n-butanethiol; 1-mercaptobutane

Physical Properties
Physical Properties
Physical description Colorless liquid with a strong, garlic-, cabbage-, or skunk-like odor.
Boiling point 209°F Molecular weight 90.2
Freezing point/melting point 176.2°F Vapor pressure 35 mmHg
Flash point 55°F Vapor density
Specific gravity 0.83 Ionization potential 9.15 eV
Lower explosive limit (LEL) Upper explosive limit (UEL)
NFPA health rating 1 NFPA fire rating 3
NFPA reactivity rating 0 NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs
Monitoring Methods Used by OSHA
Monitoring Methods Used by OSHA
Analyte code (IMIS no.) 0480
Sampling group
Sampler/Sampling media GFF (37 mm Gelman Type A) coated with mercuric acetate [SKC 225-9007]
Sampling time*
Sampling volume (TWA)*

10-150 L

Sampling flow rate (TWA)*

0.1-0.2 L/min

Sampling volume (STEL/Peak/C)*
Sampling flow rate (STEL/Peak/C)*
Analytical method instruments GC-FPD
Method reference NIOSH 2542 (partially validated)
Notes

Protect samples from light.

Special requirements

* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Wipe Method
Wipe Method
Sampler/Sampling media
Bulk Method
Bulk Method
On-Site Screening Techniques
On-Site Screening Techniques
Device
Model/Type
Sampling information
(see manufacturer instructions)
Exposure Limits
Exposure Limits
OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
NIOSH REL
Up to 10-hour TWA
(ST) STEL
(C) Ceiling
ACGIH TLV©
8-hour TWA
(ST) STEL
(C) Ceiling
CAL/OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
PEL-TWA

10 ppm (35 mg/m³)

REL-TWA TLV-TWA

0.5 ppm [1968]

PEL-TWA

0.5 ppm (1.5 mg/m³)

PEL-STEL REL-STEL TLV-STEL PEL-STEL
PEL-C REL-C

0.5 ppm (1.8 mg/m³) [15 minutes]

TLV-C PEL-C
Skin notation

N

Skin notation

N

Skin notation

N

Skin notation

N

Notes:

See 29 CFR 1910.1000 Table Z-1.

The Construction and Maritime Industries PEL is 0.5 ppm (1.5 mg/m³) for an 8 hr TWA. See 29 CFR 1926.55 Table 1 and 29 CFR 1915.1000 Table Z-Shipyards.

Notes: Notes: Notes:
Health factors:  See NIH-NLM PubChem. IDLH

500 ppm

Carcinogenic classifications: Not listed Notes:
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
Additional Resources and Literature References
Additional Resources and Literature References

NOAA: CAMEO Chemicals - Butyl mercaptan

NIOSH: Pocket Guide to Chemical Hazards - n-Butyl mercaptan

Literature References

  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - n-Butyl mercaptan. See annual publication for most recent information.
  • No authors listed: butyl mercaptan. The Good Scents Company.
  • Ames, R.G. and Gregson, J.: Mortality following cotton defoliation: San Juaquin Valley, California, 1970-1990. J. Occup. Environ. Med. 37(7): 812-819, 1995.
  • Pohanish, R.P. (editor): Butyl Mercaptan. In, Sittig's Handbook of Toxic and Hazardous Chemicals and Carcinogens, Fourth Ed., Vol. 1. Norwich, NY: Noyes Publications, William Andrew Publishing, 2002, pp. 418-419.

Last Updated Date : 06/06/2022