CAS 55702-46-0 appears in our catalog under these names: PCB No. 21, PCB No. 21 10 µg/mL in Isooctane, PCB 21, ROTI®Star, 10 mg, glass, PCB 21, Concentration: 100 µg/ml Solvent: Isooctane. Offered by: Dr. Ehrenstorfer, Roth, HPC Standards. Available pack sizes: 10mg, 10ml, 1x5ml.