In-mould Foil Foaming with PU. In-mould foil foaming technology is in the process of entering the field of vehicle bodies. In agricultural vehicles and construction machines moulded parts made of PU strengthened thermoplastic foils are convincing because of their high stability, their extraordinary bearing strength and their especially good economy. Glass fibre reinforced variants have already become generally accepted in some cases as the easier, more versatile and more economical alternative to SMC.