Operating Temperature Range for Galden® PFPE

Galden® HT heat transfer fluids are widely recognized for their excellent thermal stability and broad operating temperature range, making them suitable for demanding industrial heat transfer applications. One of the key advantages of Galden® HT fluids is their wide range of boiling points, which extend approximately 55°C to 270°C (131°F to 518°F). This range is significantly broader than that of many other commercially available fluorinated heat transfer fluids, allowing Galden® HT products to be used across a variety of thermal management systems that require reliable performance under different temperature conditions.

Within the Galden® HT series, the High Boiler (HB) grades are specifically designed for high-temperature applications. These grades have boiling points ranging 170°C to 270°C (338°F to 518°F), which enables them to operate effectively in systems with end-use temperatures of up to 290°C (554°F). This high thermal tolerance makes Galden® PFPE fluids particularly suitable for processes that demand stable heat transfer at elevated temperatures, such as semiconductor manufacturing, electronics cooling, and specialized industrial heating systems.

The recommended operating temperature range for each Galden® HT fluid is determined by both its physical properties and system requirements. The lower limit of the operating range is defined by the fluid’s viscosity. Specifically, the minimum recommended temperature is the point at which the fluid viscosity reaches approximately 20 cP (11–12 cSt). This viscosity level corresponds to the typical operating range of many commercially available pumps, ensuring that the fluid can circulate efficiently within the system without causing excessive strain on pumping equipment.

On the other hand, the upper limit of the operating temperature range is determined by the boiling point of the fluid. To maintain safe and stable operation, it is generally recommended that the maximum operating temperature remain at least 10°C (18°F) below the fluid’s boiling point. This safety margin helps prevent excessive vapor formation, ensures consistent heat transfer performance, and extends the service life of the fluid within the system. By following these guidelines, users can optimize the performance, reliability, and longevity of Galden® PFPE heat transfer fluids in a wide range of industrial applications.