The choice of material—Plastic (PP, RPP, PVDF), Metal (Stainless Steel 304/316L, Carbon Steel), or Ceramic—is the most critical factor. You must evaluate the operating temperature and chemical corrosiveness of your process. For example, Ceramic packing is ideal for high-temperature acid services, while Plastic packing offers excellent corrosion resistance at lower temperatures (typically <120°C). Metal packing provides superior mechanical strength and heat resistance for high-pressure distillation.