TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES

**Definition:** This place covers:

The treatment of inorganic compounds other than fibrous fillers, to enhance their pigmenting or filling properties.

Preparation of carbon black.

Preparation of inorganic materials being no single chemical compounds and used as pigments or fillers.

**Limiting references (this place does not cover):** - Treatment of materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone -> C04B14/00 , C04B18/00 , C04B20/00