What are polyurethanes? (Chinese & English subtitles)

We use polyurethane plastics in one form or another every day - at home, in our offices and cars, for sport and leisure activities and on holiday.
Polyurethanes are versatile, modern and safe. They are used in a wide variety of applications to create all manner of consumer and industrial products that play a crucial role in making our lives more convenient, comfortable and environmentally friendly.