... % use in rubber, oil and pharmaceutical... ZnCO3 57.5%,57%,55% TESTING CONTENTS ANALYSISITEMACTOR GRADEUPTO GRADERESULTSAPPEARANCEWHITE POWDERWHITE POWDERWHITE POWDERMAIN COMPONENT ... (Zn) CONTENT≥57.5≥56.658.0BURN LOSS25.0 – 28.025.0 – 32 ... 93.097.0Cd Content≤1.0- -0.0015 Zinc Carbonate 57.5%