As referenced in the Hazard Warning Signage System under Category B Pictograms, here is a list of the current OSHA known or suspected carcinogens.

  • 4-Nitrobiphenyl, Chemical Abstracts Service Register Number (CAS No.) 92933;
  • alpha-Naphthylamine, CAS No. 134327;
  • methyl chloromethyl ether, CAS No. 107302;
  • 3,3'-Dichlorobenzidine (and its salts) CAS No. 91941;
  • bis-Chloromethyl ether, CAS No. 542881;
  • beta-Naphthylamine, CAS No. 91598;
  • Benzidine, CAS No. 92875;
  • 4-Aminodiphenyl, CAS No. 92671;
  • Ethyleneimine, CAS No. 151564;
  • beta-Propiolactone, CAS No. 57578;
  • 2-Acetylaminofluorene, CAS No. 53963;
  • 4-Dimethylaminoazo-benzene, CAS No. 60117; and
  • N-Nitrosodimethylamine, CAS No. 62759