Hydrophilic Fumed Silica 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. B. Specification:Q/SHG19-2008 Item Specification F-150 F-200 Apperance White powder Specific surface area m2/g 150±20 200±20 PH Value 3.6～4.3 Loss On Heating105℃ 2h% 1.0 1.0 Ignition Loss 1000℃% ≤ 1.0 1.0 Apparent density g/L 30-60 Sieve Residue 325 mesh ≤, % <0.02 <0.02 HCl Wt.% <0.025 <0.025 SiO2 Wt.% ≥99.99 ≥99.99 Al2O3 Wt.% 〈0.05 〈0.05 Fe2O3 Wt.% 〈0.003 〈0.003 Tio2 Wt.% 〈0.03 〈0.03 Application: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.