Polyurethane: resin, foam & rubber for casting, coating, laminating, moulding, shaping, filling & supporting

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Polyurethane is a versatile material: large and stable objects can be cast very quickly from casting resin. Polyurethane foam comes in soft and hard, it is very light and therefore well suited for fillings and to build light substructure moulds e.g. for heavy plaster moulds. Of course, you can also mould directly with the PU foam. From polyurethane rubber (flexible) casting moulds can be made, which are particularly well suited for casting e.g. gypsum and concrete. Since high temperatures can arise during the curing of the PUR rubber, the material is also particularly suitable for moulding plaster, concrete and other temperature-insensitive master models.

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Polyurethane casting resins

Polyurethane casting resins have the advantage (which can also become a disadvantage) that you can and must cast very quickly with them. The pot life is only a few minutes, the demoulding time can be an hour, depending on the casting resin. Because the material hardens so quickly, any work with the fast casting resin should be well prepared and all tools and vessels should be handy.

Polyurethane has several advantages: It iseasy to mix and process, even with fillers and pigments. Polyurethane has low shrinkageg when cured and has high heat resistance after curing. It can be used to work thin-walled, small parts and still be stable. One disadvantage is that the material reacts slightly with moisture before curing and undesirable foaming can occur. If polyurethane is used as a casting compound, it is essential to use a suitable release agent!

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