?maximum limit of impurities: Soluble matter in H2O: 0.2 % Soluble matter in HCl: 2.0 % Loss on ignition 980°C: 2.0 % Loss on drying at 105°C: 0.5% Chloride (Cl): 0.01% Non siliceous substances: 25 % Residual solvents (Ph.Eur/USP): passes test Leachable As: 0.001% Leachable Pb: 0.001% Leachable Fe: 0.04 % Heavy metals (as Pb): 0.005% Residual metals (according to EMEA/CHMP/SWP/4446/2000): No metal catalysts are used in the manufacturing process. :
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Siliceous Earth purified and calcined (USP-NF) pure, pharma grade