Bespel RSP, a polyimide resin, is a general term for parts molded from powdered all-aromatic polyimide resin developed by DuPont using advanced technology. Bespel RSP exhibits excellent heat resistance and wear resistance among high-performance resins. Additionally, there are grades with superior sliding properties under non-lubricated conditions, as well as antistatic grades. Due to material constraints, the diameter ranges from approximately Φ1mm to 90mm. Custom processing to meet customer specifications, such as holes, is also possible. Bespel R is a trademark or registered trademark of DuPont in the United States.

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Ball bearings, thrust bearings, casters, ball valves, ball seals, and ball joints in load-bearing areas such as high temperatures and oil-free environments. They are also excellent as components used for transporting wafers and FPDs in semiconductor and FPD manufacturing equipment, due to their high purity and low particle generation. They have a proven track record in reducing maintenance costs due to their excellent wear resistance.