... . size: 20~100,325,400,800,1000mesh 2. shape: powder 3. color: black 4. usage: rubber,coating,paint,decorate Packaging & Delivery:1 ... 7-15 days after receipt of prepayment Specifications:mica biotite powder black powder size:20~100,325,400,800,1000mesh usage: rubber,coating ... 55-75%1,280 degree3. Particle Standard of Primary Mica Powder: Specs Content20 mesh40 mesh60 mesh100 meshmesh%mesh%mesh%mesh%Size ...