PEEK 30% Glass Filled Plate

Thirty percent glass fibre turns PEEK from a tough material into a rigid one. Tensile modulus reaches 1,000,000 psi and flexural modulus 1,000,000 psi against 650,000 and 600,000 for unfilled, compressive strength rises to 25,000 psi at 10% strain and hardness to Rockwell M103. The headline is thermal: heat deflection temperature at 264 psi is 600F against 320F unfilled, and continuous service is 500F with short excursions to 572F. Creep resistance and dimensional stability improve with it.

It is machined into structural brackets, housings, pump and valve bodies, manifolds and fixturing that must carry static load at temperature rather than slide against steel. Melting point is 633F and moisture pickup is 0.2% in 24 hours. Two limitations are worth stating plainly. Elongation at break falls to about 2%, so it is notch-sensitive and cracks rather than yields - avoid sharp internal corners. And the glass fibres are abrasive to the mating surface, which is why the manufacturer calls it less suitable for bearing and wear duty despite the strength. Published stiffness and heat deflection vary noticeably between makers of this grade, so match the figure to the brand being shipped.