ETHYL MERCAPTAN (ETHANETHIOL)†

Chemical Identification
Chemical Identification
CAS # 75-08-1
Formula

C₂H₆S

Synonyms

ethanethiol; ethyl sulfhydrate; mercaptoethane

Physical Properties
Physical Properties
Physical description Colorless liquid with a strong, skunk-like odor.
Boiling point 93.9°F Molecular weight 62.1
Freezing point/melting point -234°F Vapor pressure 442 mmHg
Flash point -55°F Vapor density
Specific gravity 0.826 Ionization potential 9.29 eV
Lower explosive limit (LEL) 2.8% Upper explosive limit (UEL) 18%
NFPA health rating 2 NFPA fire rating 4
NFPA reactivity rating 1 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.) 1220
Sampling group
Sampler/Sampling media
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
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 Detector tube Detector tube Infrared spectrophotometer Organic vapor analyzer
Model/Type Gastec 72 Matheson-Kitagawa 8014-165SA Miran 1A & 1B
Sampling information
(see manufacturer instructions)
1-120 ppm range 1-160 ppm range 0.8 ppm@3.3 µm
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
 

 

REL-TWA
 

 

TLV-TWA
 

0.5 ppm [2003]

PEL-TWA
 

0.5 ppm (1 mg/m³)

PEL-STEL
 

 

REL-STEL
 

 

TLV-STEL
 

 

PEL-STEL
 

 

PEL-C
 

10 ppm (25 mg/m³)

REL-C
 

0.5 ppm (1.3 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

Notes:
 

 

Notes:
 

 

Notes:
 

 

Health factors:  See NIH-NLM PubChem. IDLH
Carcinogenic classifications: 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 - Ethyl mercaptan

NIOSH: Pocket Guide to Chemical Hazards - Ethyl mercaptan

Literature References

 
  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Ethyl mercaptan. See annual publication for most recent information.

Last Updated Date : 11/30/2018