This product can be used in soles, tire, silicon rubber, plastic, ... not dissolve in other acids, water and other kind of melting agents. This product can be used in soles, tire, silicon rubber ... /gPHOil absorption cm3/gSiO2 (Dried) %Average particle umLoss on Drying (105oC)Loss on Ignition (1000oC)Residue 45 um %Una-18020powderCTAB 100-2405 ... -3.5≥98≤54.0-8.0≤7.0 silica(the best price)