A number of SKF bearings are now available with cages made of the high-tech engineering PEEK polymer. PEEK stands for polyetheretherketon and is a partially crystalline thermoplastic. The most important benefits from using PEEK cages is the materials combination of strength and flexibility, high fatigue strength and high temperature limit of more than 160 degrees Celsius at constant level and more than 200 degrees Celsius as peak temperature. PEEK also offers high wear-resistance, low friction and good electrical and insulating properties. Bearings equipped with PEEK cages can be found in the angular contact ball bearing and cylindrical roller bearing assortments.