prophylactic devices are made in an inert atmosphere by cooling mandrels on which the devices are to be deposited , dipping the mandrels into a polymeric material in a solvent / carrier and a mold release agent , rotating the mandrels during and after the dipping , and evaporating the solvent after dipping . the apparatus includes an air lock between a section in which these functions are performed and a section located in an air atmosphere for removing the devices from the mandrels , followed by cleaning the mandrels for use in a subsequent production run for making devices .