CPC Subgroup
C01B 33/12 Silica; Hydrates thereof, e.g. lepidoic silicic acid
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
6 direct subcodes
Child Classifications
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- C01B 33/14 Colloidal silica, e.g. dispersions, gels, sols
- C01B 33/16 Preparation of silica xerogels
- C01B 33/18 Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof (preparation of aerogels by dehydrating gels C01B33/158; treatment to enhance the pigmenting or filling properties C09C)