PVC is not rubber, it should belong to the plastic category. Plastics are generally hard and rubber is generally soft, but this is not absolute. Because PVC soft rubber is a special case, this is because PVC soft rubber feels like rubber, in fact, it is not rubber at all. Rubber is divided into natural rubber, styrene-butadiene rubber, chloroprene rubber, cis-butadiene rubber, nitrile-butadiene rubber, silicone rubber and so on, nearly 20 kinds.
Rubber is a kind of polymer material. High elasticity at room temperature is the unique characteristic of rubber material, which is not available in any other material, so rubber is also called elastomer. The performance of high elastic material is that it has large elastic deformation under external force, up to 1000%. After removing external force, the deformation recovers quickly, while the deformation of metal material with general elasticity is only about 1%. Rubber is a kind of material, which can quickly and forcefully restore its deformation under large deformation and can be modified.