The material we are discussing goes by many names - PAEK, AF825, Cryogenic PEEK and Low temperature PAEK, however, for the purpose of this blog it will be known as PAEK AF825.

In the face of the ongoing global PCTFE resin shortfall, the need for alternative materials has become imperative for valve and cryogenic equipment manufacturers worldwide. As leading processors of advanced fluoropolymer solutions, we rose to the challenge and recommended PAEK AF825 as a viable substitute for PCTFE. This remarkable material, which is an alternative for many applications suited to PCTFE but offers several performance improvements, especially coefficient of friction at cryogenic temperature, proves to be a game-changer for low-temperature PAEK valves. In this blog post, we will delve into the advantages of PAEK AF825, including enhanced strength, thermal conductivity, dimensional stability, and friction coefficient. Join us as we explore how PAEK AF825 works as an incredible alternative to PCTFE in cryogenic applications and dynamic scenarios, ensuring leakproof performance.

  • Higher Tensile Strength and Improved Ductility: PAEK AF825 boasts higher tensile strength and lower modulus, providing increased ductility across a broader temperature range. This combination ensures optimal performance even in extreme low-temperature environments, delivering robust and reliable valve solutions.
  • Faster Reaction to Temperature Changes and Consistent Sealing: With higher thermal conductivity, PAEK AF825 facilitates a faster response to temperature fluctuations, contributing to more consistent and reliable sealing performance. This property is crucial in applications where precise and rapid sealing is required.
  • Dimensional Stability and Minimised Shrinkage: The lower and constant coefficient of thermal expansion in PAEK AF825 guarantees exceptional dimensional stability, reducing the risk of shrinkage at lower temperatures. This advantage ensures precise and reliable valve operation even under extreme cryogenic conditions.
  • Reduced Static and Dynamic Coefficient of Friction: PAEK AF825 demonstrates a lower static and dynamic coefficient of friction compared to PCTFE, especially at cryogenic temperatures. This characteristic minimises resistance and allows for smoother movement, resulting in improved operational efficiency and reduced wear in dynamic valve applications.
  • Outstanding Chemical Resistance and Strength: PAEK AF825 inherits the exceptional properties of PEEK, including high chemical resistance and strength. This makes it an ideal choice for demanding cryogenic applications involving aggressive chemicals such as LNG and nitrogen, ensuring reliable and durable valve performance.


As the global PCTFE resin shortage continues, the emergence of PAEK AF825 as an outstanding alternative offers new possibilities for low-temperature PAEK valves. With its enhanced tensile strength, thermal conductivity, dimensional stability, friction coefficient, and chemical resistance, it could be said that PAEK AF825 outperforms PCTFE in cryogenic applications and dynamic scenarios where leakproof performance is essential. Our innovative solution provides valve manufacturers with a reliable and high-performance material during these challenging times.

For detailed information on PAEK AF825 and its various applications, please visit our dedicated materials page.