1,zinc carbonate basic 56.5%,57%,57.5% 2,free sample available 3,SGS certificate zinc carbonate basic 56.5%,57%,57.5% 1. Product features This product is white slight amorphous ... and other chemical products. 3,Specification ItemsIndex (%)IIIIIIZn content ≥57.55756.5Loss on ignition25.0— 28.025.0--30.025 ... Sieve Residue (75microns mesh): ≥959493Cd ≤0.00040.0010.005 zinc carbonate basic 56.5%,57%,57.5%