CAS 11104-28-2 appears in our catalog under these names: Aroclor 1221, Aroclor 1221 1000 µg/mL in Cyclohexane, Aroclor 1221 1000 µg/mL in Methanol, ASTM Method D4059 Aroclor 1221 50 µg/g in Transformer Oil. Offered by: Dr. Ehrenstorfer. Available pack sizes: 50mg, 1ml, 5x1ml.