WEB EXCLUSIVE: Rilsan HT, a polyphthalamide (PPA) high-temperature thermoplastic, exhibits a flexibility previously unknown in this material family. PPA injection molding resins have been replacing metal in automotive under-hood parts, but up to now, their inherent brittleness has prevented them from replacing metal tubing. Now, Rilsan HT, introduced last year by Arkema Inc., Philadelphia, is being used for engine-compartment tubing by several automakers. It is reportedly the first PPA extrusion resin with enough flexibility for such uses. It has also been selected for powertrain applications such as oil transport, exhaust-gas recirculation, and blow-by lines. Besides high heat resistance, it has long-term chemical and thermo-oxidation resistance, very low moisture uptake for high dimensional stability, and low creep. Rilsan HT can be extruded on standard equipment into smooth or corrugated tubing and is easily thermoformed and assembled, according to Arkema. Rilsan HT also comes in ductile injection molding grades.
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