WESTLAKE, OHIO (July 3, 12:40 p.m. ET) — Liquid silicone rubber has provided a profitable growth path for GW Silicones, a unit of injection molder GW Plastics Inc. of Bethel, Vt.
At the recent Plastics in Medical Devices conference in Westlake, GW Silicones General Manager Mark Hammond, along with officials of Engel Machinery Inc. and Roembke Manufacturing & Design Inc., offered tips for plastics firms that might be considering LSR work.
GW Silicones, based in Royalton, Vt., has put its money behind its intentions, recently adding at least a dozen molding machines dedicated to LSR work, and spending $3 million on a clean room for LSR applications.
LSR also provides very low variation. Recent Engel test molds for a four-cavity umbrella mold showed variation of only around 0.04 percent. LSR also offers “a better material mix” for micromolding in color dispersion and other areas, according to Broadbent.
Greg Roembke, president of Ossian, Wis.-based Roembke, pointed out that LSR is expandable and requires higher mold temperatures than typical plastics. Plastic mold temperatures typically range from 70°-150° F, while typical LSR ranges are 320°-450° F.