# NIOSH Pocket Guide to Chemical Hazards
Acetylene tetrabromide | CAS 79-27-6
CHBr2CHBr2 | RTECS KI8225000
Synonyms & Trade Names Symmetrical tetrabromoethane; TBE; Tetrabromoacetylene; Tetrabromoethane; 1,1,2,2-Tetrabromoethane | DOT ID & Guide 2504 159
Exposure Limits | NIOSH REL: See Appendix D
OSHA PEL: TWA 1 ppm (14 mg/m3)
IDLH 8 ppm | Conversion 1 ppm = 14.14 mg/m3
Physical Description Pale-yellow liquid with a pungent odor similar to camphor or iodoform. [Note: A solid below 32°F.]
MW: 345.7 | BP: 474°F (Decomposes) | FRZ: 32°F | Sol: 0.07%
VP: 0.02 mmHg | IP: ? |  | Sp.Gr: 2.97
Fl.P: NA | UEL: NA | LEL: NA |
Noncombustible Liquid
Incompatibilities & Reactivities Strong caustics; hot iron; reducing metals such as aluminum, magnesium & zinc
Measurement Methods NIOSH 2003
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: Water flush promptly Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations OSHA Up to 8 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, nose; anorexia, nausea; headache; abdominal pain; jaundice; leukocytosis (increased blood leukocytes); central nervous system depression
Target Organs Eyes, respiratory system, liver, central nervous system
See also: INTRODUCTION