Isostatic Molding

Isostatic Molding

Isostatic molding is a unique process where molding pressures are applied evenly in all directions around the part being made. This differs from compression molding, which has pressure applied in only one direction. Isostatic molding lends itself nicely to making odd shapes such as cups and buckets. An isostatically molded part is made to near net shape. Because the part is molded to near net shape, significantly less material would be used as opposed to the more standard use of blocks and cylinders. After molding, the part would be suitable for final machining.

Tapered sleeves and closed end cylinders are common shapes that are often molded isostatically. Unlike extruded and compression-molded parts, materials isostatically molded will have highly consistent material properties.

Wet- and dry-bag are two techniques for isostatic molding, which are principally identical but operationally different. The wet-bag process is similar to the basic molding procedure in which the mold is submerged in the pressurization fluid. In the dry-bag technique, the mold and the bag are fixed in place and the functions of the mold and the pressurization vessel are combined. 

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