Hydrophilic Fumed Silica A.Characteristic: It is a white and colloidal micro-particle with its primary micro-particle from 5-40 nm and has obvious properties such as thixotropy, reinforcing, thickening and filling etc. and is insoluble in all kinds of solvents and liquids except hydrofluoric acid and concentrated bases. It is used widely in silicon rubber, construction sealant, coating, electron and electric, aerospace, medicine and medical material, resin processing, printing ink, pesticide and other industries. F-150: used widely in silicone acid rubber, sulfurized silicone rubber in ambient temperature (low water content), silicone neutral rubber. F-200: used widely in sealing ring, sealing gasket, petroleum pipeline, insulator, tablet powdered preparation, artificial viscera, infusion tube, latex nipple and high quality oil ink. F-380: used widely in reinforcing agent for silicone rubber, medical silicone rubber for transparent artificial organs and artificial heart etc. Packing: packed with multi-layer paper plastic compound bag with net weight of 5 kg or 10 kg, or packed by whole plastic seal for users having special demand on water content. 10kg per bag