... content),wt. % ,min30.1(Heavy metals),(Pb)---(Water insoluble),.---(Dry weight loss),wt. % ,max0.5 ... (PH of 10% water solution)6.5-7.5 CompositionSpecification(Feed grade)(Purity),wt. ... % ,min98(Ca content),wt. % ,min30.1(Heavy metals),(Pb)0.001(Water ... ,max0.5(PH of 10% water solution)6.5-7.5As(%) ≤0.0005Pb(%)≤0.0002AppearanceWhite ...