https://www.laiko.net/products/plastic-pall-ring.html NAIKE Plastic Pall Ring is versatile. This product was advanced on the basis of Plastic Rasching Ring, and compared with it, both of them have similar cylindrical dimensions but the Plastic Pall Ring has two rows of punched out holes, with fingers or webs turned into the centre of the cylinder, which significantly increases the performance of the packing, in terms of throughput, efficiency and pressure drop. PP Pall Ring Packing Specification Technical Parameter D×H×δ mm Specific area m2/m3 Void Rate % Bulk Number g/m3 Package Density (kg/m3) F factor m-1 16*16*1 188 91 170000 85 275 25*25*1.2 175 90 53500 69 239 38*38*1.4 115 89 15800 63 220 50*50*1.5 93 90 6500 52 127 76*76*2.6 73.2 92 1927 41 94 100*100*3 52.8 94 1000 32 82 Physical & Chemical Properties Performance/Material PE PP RPP PVC CPVC PVDF Density(g/cm3) 0.94-0.96 0.89-0.91 0.93-0.94 1.32-1.44 1.50-1.54 1.75-1.78 Operation Temp(℃) 90 >100 >120 >60 >90 >150 Chemical Corrosion resistance Good Good Good Good Good Good Compression Strength(MPa) >6.0 >6.5 >7.0 >6.0 >8.0 >10.0