We are supplying high quality silica from vietnam - sio2 : 99.70% min. - fe2o3 : 0.015% max. - al2o3 : 0.1% max. - tio2 : 0.05% max. - cao : 0.01% max. - mgo : 0, 08% max. - na2o + k2o : 0 % - igloss : 0.05% max. * ( astm ) : + 25 mesh : 0.10% max. + 30 mesh : 0.40% max. - 140 mesh : 3.00% max. Regards,