... forming? Vacuum forming is a process in which a thermoplastic sheet is heated to the appropriate temperature, stretched around or into ... FINISHED ITEM GOOD QUALITY FITTING. II. Vacuum Forming Machined process: 1. Plastic sheet board:ABS, HIPS, PP, PE, PC, PMMA resin granules ... are extruded or co-extruded into thermoplastic sheet or plate that textured, smooth, gloss or matt, fire ...