# NIOSH Pocket Guide to Chemical Hazards
Carbon tetrachloride | CAS 56-23-5
CCl4 | RTECS FG4900000
Synonyms & Trade Names Carbon chloride, Carbon tet, Freon® 10, Halon® 104, Tetrachloromethane | DOT ID & Guide 1846 151
Exposure Limits | NIOSH REL: Ca ST 2 ppm (12.6 mg/m3) [60-minute] See Appendix A
OSHA PEL†: TWA 10 ppm C 25 ppm 200 ppm (5-minute maximum peak in any 4 hours)
IDLH Ca [200 ppm] | Conversion 1 ppm = 6.29 mg/m3
Physical Description Colorless liquid with a characteristic ether-like odor.
MW: 153.8 | BP: 170°F | FRZ: -9°F | Sol: 0.05%
VP: 91 mmHg | IP: 11.47 eV |  | Sp.Gr: 1.59
Fl.P: NA | UEL: NA | LEL: NA |
Noncombustible Liquid
Incompatibilities & Reactivities Chemically-active metals such as sodium, potassium & magnesium; fluorine; aluminum [Note: Forms highly toxic phosgene gas when exposed to flames or welding arcs.]
Measurement Methods NIOSH 1003; OSHA 7
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet or contaminated Change: No recommendation Provide: Eyewash, Quick drench | First Aid (See procedures) Eye: Irrigate immediately Skin: Soap wash immediately Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH At concentrations above the NIOSH REL, or where there is no REL, at any detectable concentration: (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, skin absorption, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin; central nervous system depression; nausea, vomiting; liver, kidney injury; drowsiness, dizziness, incoordination; [potential occupational carcinogen]
Target Organs central nervous system, eyes, lungs, liver, kidneys, skin Cancer Site [in animals: liver cancer]
See also: INTRODUCTION