FRP is commonly used in mass transit part manufacturing due to its excellent strength to weight ratio, impact and corrosion resistance, relatively low tooling cost and ability to be molded into complex shapes with color throughout the part, often eliminating secondary operations such as painting.
The 6-0" long protective shield shown at the right for the third rail pick-up (power rail) on a high speed car is one of more than 1500 produced via Resin Transfer Molding (RTM) for the Chicago Transit Authority. The parts were produced from a single light weight tool. Resin Transfer Molding was chosen for the process due to its excellent economics and part to part reproducibility.
The air handling system damper blades shown at the left were also resin transfer molded, this time for a rail car system sold to Westcode/ Kawasaki for use in China. The resin is a low flame/ low smoke polyester, with color molded in. The blade shafts are stainless steel, and are integrally molded with the blade itself, eliminating secondary operations. Use of RTM resulted in economic processing for the over 1000 pieces required, as well as resulting in a mold finish on both sides of the part, allowing maintenance of tight tolerances and damper seal properties.
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