Flexural Properties of PEEK

The relationship between flexural strength ("pressure stability") and temperature is shown in the figure below. PEEK 381G and 450G, which we use for our PEEK parts and capillaries, have an exceptionally high strength which is maintained over a wide temperature range.

The burst pressure and the maximum pressure figures we refer to in our tables are obtained at room temperature. Be aware that elevated temperatures reduce the flexural strength of PEEK. Using PEEK at a temperature of about 130°C reduces the stability to approximately half of the stability at room temperature. At 200°C the burst pressure is reduced to about 1/10 of the standard burst pressure. The flexural strength of PEEK does not change at temperatures below the freezing point and on down to -50°C.