China Clay: China Clay is Hydrated Alluminium Silicate containing Al203, Sio2 and H2O. China Clay Technical and Physical Properties. Sr. No. : Parameters : Percentage 1. Lol : 13+-2 2. Mg0 : Less than 0.5 3. Sio2 : 45-48 4. Fe2o3 : Less Than 1.0 5. Al2o3 : 30-38 6. Cao : Less Than 1.0 7. Na2O : 0.1 8. K2O : 0.1 9. Whiteness : 78 - 82 10. Particle Size/Mesh Size : 200, 300, 400 And 500 11. Appearance : Free Flowing White Powder Application : Paint, Rubber, Ceramic, Electrode Etc.