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Plastic ziplock bags Polyurethane thermo-elastics have a high tear strength, usually up to 10 times that of natural rubber. However, the high temperature performance of the hinge is poor, and the ambient temperature is lower than the energy. In terms of electrical properties, since the polyurethane thermal elastomer has a certain hydrophilic property, it absorbs small moisture and the insulation is decreased. The use of a restricted thermoplastic elastomer in the case of high insulation is used in addition to the external diene. In most cases, raw materials for injection molding use new materials. However, for some products that are not very demanding, people often use recycled raw materials for injection molding. This aspect can reduce costs; on the other hand, recycling of plastic materials can be achieved.