Engineers: Source Heat Resistant Parts in China Without Tooling Rework ! Engineer inspecting heat-resistant polymer samples The recommended path is straightforward: pick a high-performance polymer, PPS, PEEK, TPI, or a heat-stabilized polyamide like Ultramid® Endure, matched to your process and part volume, then demand continuous use temperature (CUT) and heat deflection temperature (HDT) data plus a physical sample before tooling starts.