Polyurethane (PM-780 Dry)

This amber-coloured transparent polymer is an industrial-strength urethane rubber. Its toughness allows it to be reused again and again, for example as a mould for decorative cast concrete pieces. Regardless of the end-product or even type of polyurethane you are using, the way in which you use polyurethane resins is always the same: the raw materials come in two parts, a liquid isocyanate (a very reactive chemical derived from petroleum) and a polyol (a long-chain alcohol), which are mixed to a specified ratio to create a reacting liquid, which is then poured into a mould or onto a surface and left until it cures to form a solid object. This relatively low-tech process makes it a useful material for the making of prototypes.