An apparatus for manufacturing products from material which is thermoplastically deformable, as from plastic, comprising:—a mold (2) with at least one mold cavity (3);—in the or each mold cavity (3) at least one slide (8);—movement means for moving each slide (8);—closing means for opening and closing the mold (2);—feed means for introducing, with the mold cavity (3) closed, said material in at least substantially plastic condition into the or each mold cavity; wherein the movement means (9) for moving the slide (3) are arranged for moving said slide forward at a relatively high speed relative to the movement speed of the mold parts upon opening and closing thereof, from a position at least partly retracted from the mold cavity, such that said material, as a result, is displaced in the mold cavity for obtaining the filling thereof, preferably at a speed high such that adiabatic heat development occurs in the or each mold cavity.