... -15%K2O:4-6%1.Specification%A-20 mesh+100mesh+20 mesh≤2%,-100 mesh≤5%A1Fe2O3≤0.20,SiO238-42Al2O328-32CaO5-7K2O4 ... ,SiO238-42Al2O328-32CaO5-7K2O4 -6Na2O12-15MgO0.1-0.4 B-80 mesh+80 mesh<3%-180mesh>32%)B1Fe2O3≤0.25,SiO238-42Al2O328-32CaO5-7K2O4 ...