... , CPVC, PVDF, PTFE, and HDPE.Size: 5/8" (16mm); 1" (25mm); 1.1/2" (38mm); 2" (50mm); 3" (76mm).Technical data of Plastic pall ring ... (m2/m3)Void volume(m3/m3)Dry packing factor ( m-1 )Heaping number (n/m3)Heaping weight (kg/m3)Φ1616×16 ... ×25×1.21750.902395350091Φ3838×38×1.41150.892201580071Φ5050×50×1.5930.90127650056Φ7676×76×2.6730.9294193060 Dia.5/8", 1", 1.5", 2", 3 ...