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PET, also known as a thermoplastic elastomer, is a polymer or polymer alloy material with the structure of a rubber soft chain segment (or rubber phase) and a plastic hard chain segment (or continuous plastic phase). The most common PET is a polymer alloy material synthesized by mixing SEBS and SBS.

PET and silicone have many similar properties, such as soft touch, elastic rubber, environmentally friendly and non-toxic. Silicone is a traditional material, PET only appeared in the rubber and plastics industry for nearly a decade. PET and silica gel have similar characteristics, and each has its advantages and disadvantages. In recent years, PET has replaced silicone in many fields by virtue of its advantages, and there is a way to use silicone to make it unusable.