CPC Subgroup
C01B 33/152 Preparation of hydrogels
Full Title
Silicon; Compounds thereof ( C01B21/00, C01B23/00 take precedence; persilicates C01B15/14; carbides C01B32/956) > Silicon oxides; Hydrates thereof > Silica; Hydrates thereof, e.g. lepidoic silicic acid > Colloidal silica, e.g. dispersions, gels, sols > Preparation of hydrogels
2 direct subcodes
Child Classifications
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- C01B 33/154 by acidic treatment of aqueous silicate solutions