The main material of oil refining catalyst, silica gel and white carbon black.Low price and good quality. ... absorbent, catalyst and its carrier, desalt agent of brine, hydrated silica and absorbent. Specification: ITEMIndexOne Sort 12345Density35.0-37.039.0 ... .0Sodium oxide (Na2O),% >7.08.210.29.512.8Silicon dioxide (SiO2),% > 24.626.025.722.129.2Modulus M3.5-3.73 ...