According to its occurrence, the pores can be classified into intergranular, intragranular pores, pores in filler and seam - like pores, and this can further be divided into 12 sub - types.

• 按孔隙的产状分布将孔隙类型分为粒间孔、粒内孔、填隙物内孔和缝状孔隙四类,并细分为十二个亚类;