PEEK outperforms steel in molded roller bearing application
Published: February 6th, 2013
Polyetheretherketone's (PEEK) chemical resistance, high heat deflection temperature, low creep, and exceptional dimensional stability made it the material of choice for a new line of roller bearings. Taiwan's Link Upon Advanced Material Corp. is utilizing KetaSpire PEEK from Solvay Specialty Polymers for a roller bearing applied in conjunction with ceramic balls to drive an automatic shaft. As the roller bearing rotates, it causes the ceramic balls to rotate as well with very little stiffness and minimal friction.
Solvay noted that Ketaspire's low coefficient of linear thermal expansion (CLTE) helps ensure dimensional stability and allows tight tolerances, adding that PEEK roller bearings are more durable than those made of competing materials like stainless steel.
The use of PEEK allows the roller bearing to be used in environments up to 240°C (464°F) relative thermal index (RTI), while its corrosion resistance allows for smooth rotation in moderate acid-alkali environments. The PEEK roller bearings come in a range of sizes from 26 mm/1.0 in. (inner diam. 10 mm/0.39 in.) by 8 mm/0.31 in. to 72 mm/2.83 in. (inner diam. 35 mm/1.38 in.) by 17 mm/0.67 in.
Beyond chemical resistance, Solvay says KetaSpire provides a heat deflection temperature (HDT) up to 315°C (599°F), as well as long-term thermal oxidative stability, continuous use temperature up to 240°C (464°F), and chemical resistance to organics, acids, bases, and steam/hot water. Link Upon injection molds the part and then machines the final product.