High Alu Refractory brick manufactory ISO9000 Certificate Al2O3:55-75% Refractoriness: SK36,SK37,SK38 Size:230x114x65/75mm Refractory brick SK36, is high alumina brick with Al2O3 55%. The package is wooden pallet with shrinkage film, and paper protect angle.DOUBLE EGRET is the specialized manufacturer and exporter of insulation and refractory material in north of China with more than 10 years' ...