CAS: 7789-09-5 EC No: 232-143-1 MDL No: MFCD00010879 RTECS: HX7650000 UN No: UN1439; Haz Class: 5.1; Packing Group: II Crystalline Linear Formula: (NH₄)₂Cr₂O₇ MW: 252.06 Melting Point: 170° (decomposes)