PEEK 30% Carbon Filled Rod

Thirty percent carbon fibre gives PEEK the best stiffness-to-weight in the range and, unlike glass, improves rather than spoils its wear behaviour. Tensile strength is 19,000 psi on a 1,100,000 psi modulus, flexural strength 25,750 psi on a 1,250,000 psi flexural modulus, compressive strength 29,000 psi at 10% strain and hardness Rockwell M102. The dynamic coefficient of friction against steel is 0.20 and the published limiting PV is 25,000 psi-ft/min, about three times unfilled PEEK on the same test basis. Carbon also conducts heat three to four times better than unfilled PEEK, so frictional heat leaves the contact instead of building in it, and it cuts thermal expansion.

It is machined into bearings, bushings, wear rings, seal faces, pump and compressor components and structural parts where weight matters. Heat deflection temperature at 264 psi is 518F, continuous service 482F and the melting point 644F, with moisture pickup of only 0.06% in 24 hours. Know the trade-offs: elongation at break is about 5%, so it is notch sensitive; it does not insulate electrically, unlike unfilled PEEK; and fibre orientation means a machined part keeps well under the datasheet figures - testing on 30% carbon PEEK found about 62% of rated strength along the flow direction and 43% across it, so tell us how the part sits in the blank.