NIOSH Pocket Guide to Chemical Hazards

Hexachlorocyclopentadiene CAS 77-47-4
C5Cl6 RTECS GY1225000
Synonyms & Trade Names
HCCPD; Hexachloro-1,3-cyclopentadiene; 1,2,3,4,5,5-Hexachloro-1,3-cyclopentadiene; Perchlorocyclopentadiene
DOT ID & Guide
2646 151
NIOSH REL: TWA 0.01 ppm (0.1 mg/m3)
OSHA PEL†: none
IDLH N.D. Conversion 1 ppm = 11.16 mg/m3
Physical Description
Pale-yellow to amber-colored liquid with a pungent, unpleasant odor. [Note: A solid below 16°F.]
MW: 272.8
BP: 462°F
FRZ: 16°F
Sol(77°F): 0.0002% (Reacts)
VP(77°F): 0.08 mmHg
IP: ?

Sp.Gr: 1.71
Fl.P: NA

Noncombustible Liquid
Incompatibilities & Reactivities
Water, light [Note: Reacts slowly with water to form hydrochloric acid; will corrode iron & most metals in presence of moisture. Explosive hydrogen gas may collect in enclosed spaces in the presence of moisture.]
Measurement Methods
NIOSH 2518
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 flush immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations To be added later
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, respiratory system; eye, skin burns; lacrimation (discharge of tears); sneezing, cough, dyspnea (breathing difficulty), salivation, pulmonary edema; nausea, vomiting, diarrhea; in animals: liver, kidney injury
Target Organs Eyes, skin, respiratory system, liver, kidneys