What is polyurethane made of?

Polyurethane consists mainly of two types of raw materials: isocyanate and polyol, which are obtained from crude oil. The properties of polyurethanes vary very widely and depend on the nature and length of the sections of the chain between the urethane groups, the structure of the chains (linear or mesh), the molecular weight and the degree of crystallinity. Depending on the formulation and the ratio of components, with the appropriate technology, you can adjust the range of properties of the resulting polyurethane and get a hard, soft, integral, cellular (foamed) or monolithic polyurethane. Polyurethanes may be viscous liquids or may be solid substances in an amorphous or crystalline state. Their properties range from highly elastic soft rubbers (Shore hardness from 15 on a scale, A) to hard plastics (hardness on Shore 70 on a scale of D).