... /8", 1", 1.5", 2", 3", 4" Application: Use as tower packing Size customized Metal pall ring is an industry standard design ... )Specific surface area (m2/m3)Void volume(m3/m3)Dry packing factor ( m-1 )Heaping number (n/m3)Heaping weight (kg ... .9655012003704 "100×100×2.0350.955531200371 Metal pall ring for tower packing