PUR (Polyurethanes, aka Urethanes, Polyurethane Rubber)
The unique thing about plastics is that, having such vastly differing properties, they can be applied to every conceivable type of product. Unlike a carpenter or ceramicist, who works directly with their materials, the problem for a product- or industrial designer who works with plastics is that to really understand the different grades, they will have to go through the entire process of specifying, using and applying these materials. I will try to simplify this large family.
Urethanes are one of the five major groups of polymer classifications; the others are ethylenes, styrenes, vinyl chlorides and esters. Part of the reason they can be converted into so many different forms is that, like ...
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