... : PE, PP, RPP, PVC, CPVC, PVDF, PTFE, HDPE Size: 5/8", 1", 1.5", 2", 3" Use as tower packing Plastic ... surface area (m2/m3)Void volume(m3/m3)Dry packing factor ( m-1 )Heaping number (n/m3)Heaping weight (kg/m3)5/8 "16×16×11880 ... "76×76×2.6730.9294193060 Plastic pall ring (Dia.5/8", 1", 1.5", 2", 3")