... and in the tannery. CompositionSpecification(Tech grade)(Purity),wt. % ,min98(Ca content),wt. % ,min30.1(Heavy metals),(Pb)---(Water insoluble),.---(Dry weight ... (Feed grade)(Purity),wt. % ,min98(Ca content),wt. % ,min30.1(Heavy metals),(Pb)0.001(Water insoluble),.0.3(Dry weight ... (%) ≤0.0005Pb(%)≤0.0002AppearanceWhite crystalline powder 98% Feed Grade and Tech Grade Calcium formate