Consultation regarding aluminum packing

Selection of filler material: Filler materials are divided into three main categories: ceramics, metals, and plastics. (1) Ceramic fillers: Ceramic fillers possess excellent corrosion resistance and heat resistance. They are inexpensive, and have good surface wettability; however, their greatest drawback is that they are brittle and prone to breaking. It is widely used in processes such as gas absorption, gas washing, and liquid extraction. (2) Metal fillers: Metal fillers can be made from various materials, and corrosion is the main factor to consider when making a choice. Carbon steel packing is inexpensive and has good surface wetting properties; it should be given priority for use in systems with no corrosion or low corrosion potential ； Stainless steel packing has strong corrosion resistance and can generally withstand the corrosion of common substances other than Cl–. However, it is more expensive, and its surface wettability is poor; in certain special applications (such as vacuum distillation processes with extremely low spray densities), its surface must be treated to achieve good performance ； Packers made of materials such as titanium and special alloy steels are very expensive, and are generally used only in environments with extremely high corrosivity. Generally, metal fillers can be made into thin-walled structures; they have a high flow rate, low gas resistance, and excellent impact resistance, allowing them to be used under conditions of high temperature, high pressure, and high impact stress, which makes them the most widely used type. (3) Plastic fillers: The materials used for plastic fillers mainly include polypropylene (PP), polyethylene (PE), and polyvinyl chloride (PVC), among others; in China, polypropylene is commonly used. Plastic fillers have good corrosion resistance and can withstand the corrosion of common inorganic acids, bases, and organic solvents. It has good heat resistance and can be used for a long time at temperatures below 100°C. Plastic fillers are lightweight and inexpensive, possess good toughness, are impact-resistant and not easy to break, allowing them to be used in thin-walled structures. It features high throughput and low pressure, and is widely used in devices for absorption, desorption, extraction, dust removal, etc. The disadvantage of plastic fillers is their poor surface wettability, but this can be improved through appropriate surface treatment.