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Rubber and its products in the process of processing, storage and use, due to the combined effect of internal and external factors caused by the gradual deterioration of rubber physical and chemical properties and mechanical properties, and finally lose the use value, this change is called rubber aging. On the surface, it is cracked, sticky, hardened, softened, powdered, discolored, and mildew.

Rigid PVC is one of the most widely used plastic materials. PVC material is an amorphous material.
PVC materials are often added to the actual use of stabilizers, lubricants, auxiliary processing agents, colors, impact agents and other additives.
PVC material has non-flammability, high strength, climate resistance and excellent geometric stability.
PVC has a strong resistance to oxidants, reducing agents and strong acids. However, it can be corroded by concentrated oxidizing acids such as concentrated sulfuric acid, concentrated nitric acid and is not suitable for contact with aromatic hydrocarbons and chlorinated hydrocarbons.