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Is the material of the Kubota plate-type MBR membrane chlorinated polyethylene (CPE) or polyvinyl chloride (PVC)? Appendix: Chlorinated polyethylene (abbreviated as CPE) is a non-crystalline or semi-crystalline white granular elastomer obtained by replacing hydrogen atoms in special high-density polyethylene with chlorine atoms. It has good flexibility and a low embrittlement temperature. It possesses excellent properties such as weather resistance, aging resistance, chemical resistance, ozone resistance, and flame retardancy. It is compatible with various plastics and rubbers, and exhibits good filling properties. Depending on its performance characteristics, CPE can be used as an impact modifier, a plastic modification compatibilizer, and in the synthesis of specialty rubbers. Chlorinated polyethylene possesses excellent weather resistance, heat resistance, ozone resistance, flame retardancy, and chemical resistance. Moreover, due to the presence of both polar and non-polar segments in its molecular chain, it can be blended with PVC, PS, PC, and rubber with good compatibility; hence it can be used to manufacture plastic alloys that improve the overall properties of these materials. Polyvinyl chloride (PVC) is an amorphous plastic with poor thermal stability and is prone to thermal decomposition. PVC is difficult to burn (it has good flame-retardant properties), has high viscosity, and poor flowability. There are many types of PVC, which are divided into soft, semi-rigid, and rigid PVC. Its density ranges from 1.1 to 1.3 g/cm3 (it is heavier than water), and its shrinkage rate is high (1.5–2.5%). PVC products also have poor surface gloss.