... : PE, PP, RPP, PVC, CPVC, PVDF, PTFE, HDPE. Use as tower packing. Plastic pall ring:PE pall ring, PP pall ring, RPP ... 150°C. Plastic Pall Ring is widely used in the packing towers in petroleum industry, chemical industry, alkali-Chloride industry, coal ... )Specific surface area (m2/m3)Void volume(m3/m3)Dry packing factor ( m-1 )Heaping number (n/m3)Heaping weight (kg ...