NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

Methyl chloroform



Synonyms & Trade Names

Chlorothene; 1,1,1-Trichloroethane; 1,1,1-Trichloroethane (stabilized)
DOT ID & Guide
2831 / 160


NIOSH REL: C 350 ppm (1900 mg/m3) [15-minute] See Appendix C (Chloroethanes)
OSHA PEL: TWA 350 ppm (1900 mg/m3)
700 ppm See: 71556
1 ppm = 5.46 mg/m3
Physical Description
Colorless liquid with a mild, chloroform-like odor.
MW: 133.4
BP: 165°F
FRZ: -23°F
Sol: 0.4%
VP: 100 mmHg
IP: 11.00 eV

Sp.Gr: 1.34
Fl.P: ?
UEL: 12.5%
LEL: 7.5%

Combustible Liquid, but burns with difficulty.
Incompatibilities & Reactivities

Strong caustics; strong oxidizers; chemically-active metals such as zinc, aluminum, magnesium powders, sodium & potassium; water [Note: Reacts slowly with water to form hydrochloric acid.]
Measurement Methods
NIOSH 1003
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: No recommendation

First Aid
(See procedures)
Eye: Irrigate immediately
Skin: Soap wash promptly
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations
Up to 700 ppm:
(APF = 10) Any supplied-air respirator*
(APF = 50) Any self-contained breathing apparatus with a full facepiece
Emergency or planned entry into unknown concentrations or IDLH conditions:
(APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister/Any appropriate escape-type, self-contained breathing apparatus
Important additional information about respirator selection
Exposure Routes
inhalation, ingestion, skin and/or eye contact
Irritation eyes, skin; headache, lassitude (weakness, exhaustion), central nervous system depression, poor equilibrium; dermatitis; cardiac arrhythmias; liver damage
Target Organs
Eyes, skin, central nervous system, cardiovascular system, liver
See also: INTRODUCTION   See ICSC CARD: 0079   See MEDICAL TESTS: 0141