http://www.mayjoy-abrasives.com/brown-fused-alumina-bfa/ Brown fused alumina - BFA usually has three kinds of crushed ways, they are Roll milling, Ball milling and Barmac. Roller milling: grits are angular, sharp; Ball milling: grits are roundness, with high bulk density, durable; Barmac: grits are more roundness, higher bulk density, more durable, so Barmac production cost and selling price is high too. Refractories sizes: 0-1mm, 1-3mm, 3-5mm, 200mesh, 325mesh, etc Applications: Refractory bricks, Kiln furniture, Metallurgy Sieve standard: GB/FEPA/JIS/ANSI Brown fused alumina data sheet: (Typical size 0-1mm) Al2O3 (%)Fe2O3 (%)SiO2 (%)TiO2 (%) 95.680.071.752.44Brown Fused Alumina- BFA factory website:http://www.mayjoy-abrasives.com/brown-fused-alumina-bfa/