This Rio Grande aluminum mold frame holds two molds at the same time and a vented design allows excess rubber to escape, preventing model deformation when using natural rubber. Pre-drilled frame ends hold the sprue rod and formers perfectly centered during vulcanization so your model stays centered, ensuring a precision line-up with wax injector nozzles. The frame accommodates 1/8" sprue rods.
Rio Grande mold frames are made from solid aluminum bar stock that resists warping even after repeated heating and cooling. Carefully machined within tight tolerances, these frames feature precision milled openings with smooth, parallel walls.