... for various grade the Zinc Carbonate 57.5, 57, 56.5. Welcome your enquiries. Specialty supply ZINC CARBONATEThe Zinc ... Carbonate 57.5%, 57.0%, 56.5%, etc.Molecular Formula: ZnCO3•2Zn(OH)2•H2OMolecular ... content(Zn dry basis) % ≥ 57.5 57.0 56.5 Ignition loss %25.0-28.0 25.0-30 ... the 75um mesh % ≥ 95.0 94.0 93.0 Cadmium(Cd) % ≤ 0.10 --0.003 Note: Special requirements should ...