Difference between Polyurethanes and Urethanes?

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Polyurethane was actually invented in the mid-20th century. Resins such as plastic resins in their liquid form are mainly used for things like protecting wood surfaces like woodwork. Some of the main ingredients in Polyurethane are things like mineral spirits, nitrogen based chemicals, vegetable oil, amalgams and isocyanates. The Nitrogen in Polyurethane actually helps keep …