a).paper grade talc powder b).authentication Certificates:ISO9001; CCA; E315 c).owning talc ore mine d).free from metal Features: high brightness, transparency, uniform size, high temperature does not change color.This product specification:Average size: 5Maximum size: 7Whiteness : 94PH value : 8.7Water : 0.3SiO2 : 53~60% MgO : 30% Talc used in pottery industry 1500 mesh China