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3,3',4,4'-TCB

CAS Number

32598-13-3

Synonym

PCB congener, PCB 77; 1,1'-biphenyl, 3,3',4,4'-tetrachloro-

Occurrence/Use

Used as dielectric fluids in transformers and capacitors. PCB manufacture in the US was discontinued in 1977, and importation banned in 1979.

Cancer Potency Information

Inhalation Unit Risk (μg/cubic meter)-1: 
3.8 E-3
Inhalation Slope Factor (mg/kg-day)-1: 
1.3 E+1
Oral Slope Factor (mg/kg-day)-1: 
1.3 E+1
Comments/References: 

OEHHA 2009. Air Toxics Hot Spots Program Technical Support Document for Cancer Potencies. Appendix B. Chemical-specific summaries of the information used to derive unit risk and cancer potency values. Updated 2011.