# NIOSH Pocket Guide to Chemical Hazards
Dichloroacetylene | CAS 7572-29-4
C2Cl2 | RTECS AP1080000
Synonyms & Trade Names DCA, Dichloroethyne [Note: DCA is a possible decomposition product of trichloroethylene or trichloroethane.] | DOT ID & Guide
Exposure Limits | NIOSH REL: Ca C 0.1 ppm (0.4 mg/m3) See Appendix A
OSHA PEL†: none
IDLH Ca [N.D.] | Conversion 1 ppm = 3.88 mg/m3
Physical Description Volatile oil with a disagreeable, sweetish odor. [Note: A gas above 90°F. DCA is not produced commercially.]
MW: 94.9 | BP: 90°F (Explodes) | FRZ: -58 to -87°F | Sol: ?
VP: ? | IP: ? |  | Sp.Gr: 1.26
Fl.P: ? | UEL: ? | LEL: ? |
Combustible Liquid
Incompatibilities & Reactivities Oxidizers, heat, shock
Measurement Methods None available
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet (flammable) Change: No recommendation Provide: Eyewash, Quick drench | First Aid (See procedures) Eye: Irrigate immediately Skin: Soap flush 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 Headache, loss of appetite, nausea, vomiting, intense jaw pain, cranial nerve palsy; in animals: kidney, liver, brain injury; weight loss; [potential occupational carcinogen]
Target Organs central nervous system Cancer Site [in animals: kidney tumors]
See also: INTRODUCTION