Vacuum forming is a thermoforming process that involves heating a plastic sheet until it's pliable, then shaping it over a mold using vacuum pressure. At Gobelovac, we specialize in custom vacuum forming machines designed for durability, precision, and efficiency. Drainpipe Anti Dripfi ttings Roof Lights, Internal Door Liners, PVC Door Panels Producing Moulds for Concrete Paving Stones and Special Bricks Moulded Features for Ceilings, Fireplaces, Porch-es and other items. The sheets are heated and then sucked down by applying a vacuum to the underside of the mould, atmospheric air pressure then forces the heated plastic surface of the plastic sheet.