METHYL CHLOROFORM (1,1,1-TRICHLOROETHANE)†

Chemical Identification
Chemical Identification
CAS # 71-55-6
Formula

C₂H₃Cl₃

Synonyms

chlorothene; 1,1,1-trichloroethane; 1,1,1-trichloroethane (stabilized)

Physical Properties
Physical Properties
Physical description Colorless liquid with a sweet, chloroform-like odor.
Boiling point 165°F Molecular weight 133.4
Freezing point/melting point -26.5°F Vapor pressure 100 mmHg
Flash point >200°F Vapor density 4.6
Specific gravity 1.31 Ionization potential 11.00 eV
Lower explosive limit (LEL) 7.5% Upper explosive limit (UEL) 12.5%
NFPA health rating 2 NFPA fire rating 1
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.) 1720
Sampling group
Sampler/Sampling media CSC tube (100/50 mg) [SKC 226-01]
Sampling time*
 

 

Sampling volume (TWA)*
 

3 L

Sampling flow rate (TWA)*
 

0.2 L/min

Sampling volume (STEL/Peak/C)*
 
 

 

Sampling flow rate (STEL/Peak/C)*
 

 

Analytical method instruments GC-FID
Method reference OSHA 14 (fully validated)
Notes
 
 

 

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
 
 

350 ppm (1900 mg/m³)

REL-TWA
 
 

 

TLV-TWA
 
 

350 ppm [1992]

PEL-TWA
 
 

350 ppm (1900 mg/m³)

PEL-STEL
 
 

 

REL-STEL
 
 

 

TLV-STEL
 
 

450 ppm [1992]

PEL-STEL
 
 

450 ppm (2450 mg/m³)

PEL-C
 
 

 

REL-C
 
 

350 ppm (1900 mg/m³) [15 minutes]

TLV-C
 
 

 

PEL-C
 
 

800 ppm

Skin notation
 
 

N

Skin notation
 
 

N

Skin notation
 
 

N

Skin notation
 
 

N

Notes:
 
 

See 29 CFR 1910.1000 Table Z-1.

Notes:
 
 

 

Notes:
 
 

BEI®

Notes:
 
 

 

Health factors:  See NIH-NLM PubChem. IDLH
 
 

700 ppm

Carcinogenic classifications: IARC-3, TLV-A4, EPA-II Notes:
 
 

 

AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
 
 

350 ppm/700 ppm/3500 ppm

Additional Resources and Literature References
Additional Resources and Literature References

NOAA: CAMEO Chemicals - 1,1,1-Trichloroethane

NIOSH: Pocket Guide to Chemical Hazards - Methyl chloroform

Literature References

 
 
  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Methyl chloroform. See annual publication for most recent information.
  • EPA Air Toxics Website: Methyl chloroform (1,1,1-Trichloroethane). U.S. Environmental Protection Agency Technology Transfer Network.
  • Cohen, C. and Frank, A.L.: Liver disease following occupational exposure to 1,1,1-trichloroethane: A case study. Am. J. Ind. Med. 26(2):237-241, 1994.
  • House, R.A., Liss, G.M., Wills, M.C. and Holness, D.L.: Paresthesias and sensory neuropathy due to 1,1,1-trichloroethane. J. Occup. Environ. Med. 38(2): 123-124, 1996.
  • Pohanish, R.P. (editor): 1,1,1-Trichloroethane. In, Sittig's Handbook of Toxic and Hazardous Chemicals and Carcinogens, Fourth Ed., Vol. 2. Norwich, NY: Noyes Publications, William Andrew Publishing, 2002, pp. 2245-2248.
  • Tay, P., Pinnagoda, J., Sam, C.T., Ho, S.F., Tan, K.T. and Ong, C.N.: Environmental and biological monitoring of occupational exposure to 1,1,1-trichloroethane. Occup. Med. (Lond.) 45(3): 147-150, 1995.

Last Updated Date : 01/05/2021