IPC Subgroup
C01B 33/12 Silica; Hydrates thereof, e.g. lepidoic silicic acid
Introduced: September 1968
Last revised: January 2006
Full Title
Silicon; Compounds thereof > Silicon oxides; Hydrates thereof > Silica; Hydrates thereof, e.g. lepidoic silicic acid
Classification Context
- Section:
- CHEMISTRY; METALLURGY
- Class:
- INORGANIC CHEMISTRY
- Subclass:
- NON-METALLIC ELEMENTS; COMPOUNDS THEREOF
Related Keywords
SILICA
3 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