Rubber, plastic and fiber are polymer compounds! Molecular weight is not the difference between them!

Difference: rubber, also known as elastomer, has high elasticity at room temperature, which is a characteristic that all other chemicals do not have. Plastic does not have high elasticity at room temperature.

There are many kinds of rubber and plastics. Different types of functional groups and properties are different. This is not the difference between the two. Some rubber and plastics have common functional groups and similar properties.

Polyurethane is a kind of material between rubber and plastic. Both of them can be regarded as having shorter molecular chains and better elasticity. It can be used as rubber, but it is generally harder. If the molecular chain is longer, the performance is close to that of plastic.