The Advantages of PEEK Labyrinth Seals for High-Temperature Applications

PEEK labyrinth seals are designed to perform effectively in high-temperature applications, but there are critical thermal properties to consider that influence their performance.

Thermal Properties of PEEK Labyrinth Seals

Glass Transition Temperature (Tg): PEEK has a Tg of approximately 289°F (143°C). Operating temperatures near or above this threshold can lead to a significant softening of the material, which may compromise its mechanical properties and sealing effectiveness. Therefore, it is advisable to avoid operating conditions that approach this temperature to maintain optimal performance.

Continuous Use Temperature (CUT): The CUT for PEEK is around 480°F (249°C), indicating the maximum temperature at which the material can be used continuously without losing more than half of its strength over an extended period (100,000 hours). This makes PEEK suitable for high-temperature environments, but prolonged exposure to temperatures above its Tg can still affect its integrity.

Heat Deflection Temperature (HDT): For bearing-grade PEEK, the HDT is about 383°F (195°C), which defines the temperature at which the material can withstand a specified load without deforming. This property is crucial for applications involving fluctuating temperatures and mechanical stress.

Coefficient of Linear Thermal Expansion (CLTE): PEEK has a CLTE of approximately 2.6×10−52.6×10⁻⁵ in./in./°F for unfilled grades, meaning it expands with temperature changes. This expansion must be accounted for in designs where precise tolerances are required.

Performance in High-Temperature Applications

Durability: PEEK labyrinth seals are engineered to withstand high temperatures while maintaining their structural integrity. They exhibit excellent wear resistance and can tolerate minor contact with rotating components without incurring damage, thanks to their ability to deflect and rebound upon contact.

Corrosion Resistance: In addition to thermal stability, PEEK offers superior resistance to corrosion compared to traditional metal seals, making it ideal for use in aggressive environments often encountered in high-temperature applications like gas turbines and compressors.

Efficiency: The design of labyrinth seals allows for tighter clearances compared to metal counterparts, which enhances sealing efficiency and reduces leakage, contributing to improved operational performance in high-temperature settings.

Conclusion

While PEEK labyrinth seals demonstrate strong performance characteristics in high-temperature applications, careful consideration of their thermal properties—especially Tg and CUT—is essential for ensuring reliability and longevity. Properly managed operating conditions will allow these seals to function effectively in demanding environments.

For product details, please visit LINK, or CONTACT US.