This standard specifies the requirements, test methods, inspection rules, signs, labels, packaging, transportation, and storage of Type C silica gel. This standard applies to coarse-pore spherical silica gel and coarse-pore block silica gel made from sodium silicate and sulfuric acid. The above products are collectively called C-type silica gel. Coarse-pore spherical silica gel is mainly used as gas purifier, desiccant and acid scavenger for insulating oil, etc.; coarse-pore block silica gel is mainly used as catalyst carrier, desiccant, gas and liquid purifier, etc. Molecular formula: SiO