http://www.sd-alumina.com/mole....cular-sieve/Molecula Sieve for sale Sintered plate corundum is a pure and thoroughly burnt without adding any additives such as MgO, B2O3, with a large crystalline, well-developed 伪- Al2O3 crystal structure with a content of over 99%. Plate crystal structure, small air holes and more closed air holes and the air pore rate is roughly equivalent to that of electro molten corundum, high purity, good volume stability, small refiring shrinkage, after high temperature treatment of material resistance or pouring materials has good thermal shock stability and bending strength, but the price is higher than othe