1) Plastic chemical packingmaterials mainly include polypropylene (PP), polyethylene (PE) and polyvinyl chloride (PVC). Polypropylene is generally used in China. Plastic fillers have good corrosion resistance and can withstand corrosion from general inorganic acids, alkalis and organic solvents. It has good temperature resistance and can be used below 100°C for a long time.

Plastic tower packing are lightweight, cheap, have good toughness, impact resistance, not fragile, and can be made into thin-walled structures. It has large flux and low pressure, and is mostly used in absorption, desorption, extraction, dust removal and other devices. The disadvantage of plastic fillers is poor surface wetting properties, but their surface wetting properties can be improved through appropriate surface treatment.

(2) Ceramic packing have good corrosion resistance and heat resistance. Ceramic chemical fi are cheap and have good surface wetting properties. Their biggest shortcomings are brittleness and brittleness. It is widely used in gas absorption, gas scrubbing, liquid extraction and other processes.

(3) Metal packing can be made of a variety of materials, and corrosion issues are mainly considered when selecting. Carbon steel fillers are low in cost and have good surface wetting properties. They should be given priority for non-corrosive or low-corrosive systems. Stainless steel fillers have strong corrosion resistance and are generally resistant to corrosion from common systems except Cl–, but they are The cost is high, and the surface wetting performance is poor. In some special occasions (such as the vacuum distillation process under extremely low spray density), its surface needs to be treated to achieve good results; titanium, Fillers made of special alloy steel and other materials are very expensive and are generally only used in certain highly corrosive systems.

Generally speaking, metal tower packing can be made into thin-walled structures, which have large flux, small gas resistance, and high impact resistance. They can be used under high temperature, high pressure, and high impact strength, and have a wide range of applications.