... the features of thin wall, heat resistant, high free volume, high capacity, low resistance, high separation efficiency and so ... d×h×δ (mm)Specific surface area (m2/m3)Void volume(m3/m3)Dry packing factor ( m-1 )Heaping number ... n/m3)Heaping weight (kg/m3)5/8 "16×16×0.33620.9494232140003965/8 "16×16×0.43710.9334572140005271 "25×25 ... 100×2.0350.955531200371 Metal pall ring (Dia.5/8", 1", 1.5", 2", 3", 4")