# NIOSH Pocket Guide to Chemical Hazards
Methyl chloroform | CAS 71-55-6
CH3CCl3 | RTECS KJ2975000
Synonyms & Trade Names Chlorothene; 1,1,1-Trichloroethane; 1,1,1-Trichloroethane (stabilized) | DOT ID & Guide 2831 160
Exposure Limits | NIOSH REL: C 350 ppm (1900 mg/m3) [15-minute] See Appendix C (Chloroethanes)
OSHA PEL†: TWA 350 ppm (1900 mg/m3)
IDLH 700 ppm | Conversion 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
Personal Protection & Sanitation 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 NIOSH/OSHA 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 Escape: (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
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms 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