Chemical formula : Al2Si2O5(OH)4
Colour : White or yellowish white, earthy� mass or white powder
Structure : Dry powder semi-dry noodle, or liquid slurry
Hardness on (on Moh's scale) : 2-2.5
Specific gravity : 2.7-2.8
Bulk density(tapped) gms/cc : 0.65-0.75
Ph balance : 5.5-6.5
Refractive index : 1.565
Mesh : 300/400/500
Relative density : 1.8-2.6
Oil absorbtion ml/ 100 gm : 25-30
Brightness : 77-83%

PHYSICAL PROPERTIES:
China clay is primary clay and generally found in white colour.
Casting rate : high casting rate in slip casting compared to ball clay
Particle size: large particles as compared to ball clay.
Green MOR: Modulus of rupture is low compared to ball clay
Plasticity: Low plasticity compared to ball clay
Refractoriness: High refractoriness

USES OF CHINA CLAY POWDER :

China clay is used as a filter in paper and textile industry.
Used as a coating pigment
China clay is used in the manufacturing of porcelain, crockery and paint industry.
China clay is used in pharmaceutical and cosmetic industry.
It is used in varieties of papers, carboards and hardboards.
China clay must be free from silica and feldspar is used for electrical insulators.
China clay is used in soap , toothpaste, and cosmetic industry.