RIM stands for Reaction Injection Moulding, a process for the rapid production of complex plastic parts, obtained by mixing and reaction of polyol and isocyanate.

These components are measured, mixed and then injected into a hollow mould where a chemical reaction gives rise to a solid or foam form.

RIM polyurethane processes are replacing many conventional materials because of better performance:
 • they combine an excellent resistance to a minimum weight
 • dimensional stability
 • they provide thermal insulation
 • demonstrate sufficient resistance to inorganic acids and chemicals damaging
 • withstand aging the tests with the weather and do not release styrene
 • they may have encapsulated or moulded metal inserts
 • have the ability to have a thickness large range to select
 • They have a surface finish of class regularly used in automotive