A new coating developed for polyphthalamide (PPA) resins (also known as nylon 6T) provides a thermal barrier of up to 200 F to give the plastic added resistance to high-heat applications.
A new coating developed for polyphthalamide (PPA) resins (also known as nylon 6T) provides a thermal barrier of up to 200 F to give the plastic added resistance to high-heat applications. Test plaques of Amodel PPA from Solvay Advanced Polymers, Alpharetta, Ga., were coated with a 4-mil layer of new IC-105 from Tech Line Coatings Inc., Murrieta, Calif., and then exposed to 600 F. After an extended time, the temperature of the plastic substrate was measured at only 400 F. This differential of 200° is said to add significant capability for PPA in auto under-hood applications such as turbocharger air-cooler housings. The proprietary coating reportedly eliminated oxidation of the PPA parts, which is expected to prevent degradation of properties such as tensile strength, elongation, and stiffness. This opens up opportunities for PPA to replace aluminum or more costly polymers like PEEK. PPA parts can be coated by spraying or dipping and then air dried. Tech Line is exploring the use of its coatings with other plastics.