... , sealants, silica gels and epoxy resins and and more.TYPICAL PHYSICAL PROPERTIES-45 microns % 99Brightness92Median Size, microns 11Hardness7.0-7.5+325 ... +K2O0.03Loss on ignition0.2 As a paradigm, the above physical property and the chemical data are based on the mean ... datum. Please do not directly apply in the analysis of physical and the chemical composition under precise request. Silica Powder