The membrane material used for the membrane structure is composed of a base fabric and a coating. The base fabric is mainly composed of polyester fiber and glass fiber material; the coating material is mainly polyvinyl chloride and polytetrafluoroethylene. Commonly used membranes are polyester fiber coated polyvinyl chloride (PVC) and glass fiber coated polytetrafluoroethylene (Teflon). The main features of PVC materials are low strength, high elasticity, easy aging, large creep, and poor self-cleaning, but they are cheap, easy to process, rich in color, and good in folding resistance. In order to improve its performance, it can be coated with a layer of Teflon to improve its anti-aging and self-cleaning ability, and its life span can reach 15 years. Teflon has high strength, large modulus of elasticity, self-cleaning and durable fire resistance. However, it is expensive and difficult to fold. It has high precision for cutting production and its life span is generally more than 30 years. It is suitable for permanent buildings.
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