The present invention relates to a method for deforming a plastic plate comprising a core of resin-treated fibers, wherein the plate is obtained by-compression under elevated pressure and temperature conditions and the plate thus obtained is deformed in a mold (1, 2, 3), characterized in that the plastic plate must have a temperature in the range of (Tg+15″C)-(Tg+115″C) prior to being deformed in the mold, wherein Tg (″C) is the deformation or glass transition temperature of the plastic plate.