Description CAS#: 13770-18-8 | Formula: Cu(ClO4)2.4H2O | Specifications: Chloride 0.01 % Max, Copper content (%) 19.0 - 22.0 %, Insoluble matter 0.01 % Max, pH of 5% solution 4 - 7 pH, Sulfate 0.005 % Max