According to different customers'needs,raw materias of the prodcuts are strictly controlled in order to ensure that the product not only tades on good wear-resistant,corrosion-resistant, but also rich size. the service life can be extended at least five years, which is 15% more efficient than a rubber liner.

 al2o3 >=90%                       sio2<= 7%            cao+mgo+fe2o3+other=2%                      true density = 3.55g/cm2                               water absorption< 0.01%   

    hardness >= 9