First, a high packing yield, i.e., "the size of the packing volume or packing area per unit mass", can be obtained by having a low density and high specific strength.
　　Second, most plastics have good chemical resistance, good acid resistance, alkali resistance, resistance to all kinds of organic hibiscus agents, long-term placement, no oxidation.
　　Thirdly, it is easy to form and requires less energy to form than metal materials such as steel.
　　Fourth, it has good transparency and easy colorability.
　　Fifth, it has good strength, high strength performance per unit weight, impact resistance and easy modification.
　　Sixth, low processing costs.
　　Seventh, excellent insulation.

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