Description CAS#: 5785-44-4 | Formula: Ca3(C6H5O7)2.4H2O | Specifications: Arsenic 3 ppm Max, Assay 97.5 - 100.5 %, Heavy metals (as Pb) 0.002 % Max, Insoluble matter (in dilute acid) (%) 0.2 % Max, Loss on drying 10.0 - 13.3 %