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It is Long Fiber Composites Nylon 66,LFT is a long fiber-reinforced composite material, which is an injection molded material that has better electrical, thermal and mechanical properties than short fiber materials due to the fact that the fiber is a long fiber composite structure part. The longer the fiber, the more effectively the polymer "seizes" and transmits the stress to the fiber.
link:http://www.lfrt-plastic.com/long-glass-fiber-polyamide-66/long-fiber-composites-nylon-66.html
Long Fiber Composites Nylon 66