Therminol 55 Heat Transfer Fluids

Thermal Fluid heating is a type of indirect heating in which a liquid phase heat transfer medium is heated and circulated to one or more heat energy users within a closed loop system. Thermal oil, glycol, and water are common heat transfer mediums.

Therminol 55 is a synthetic heat transfer fluid used in moderate temperature applications. Therminol 55 fluids is designed for use in non-pressurized /low-pressure, indirect heating systems. It delivers efficient, dependable, uniform process heat with no need for high pressures.


  • Long Life : You will get years of reliable, cost effective performance, even when operating your system continuously at 290°C (550°F). This means you do not have to over specify your fluid.
  • Excellent resistance to fouling : Because Therminol 55 is a synthetic fluid, it resists the effects of oxidation 10 times better than mineral oils. Less oxidation and solids formation. For systems without nitrogen inerting, the performance advantages are significant.
  • Excellent Low Temperature Pumpability : Therminol 55 is still pumpable at -28°C (-18°F ), compared to some mineral oils that will not pump at temperatures below -7°C (20°F ). With Therminol 55, your heat transfer fluid system can start-up quickly and easily.

Therminol FF Flush Fluid

Therminol FF is the first synthetic flushing fluid for liquid phase heat transfer systems. Deposits from oxidized, thermally degraded or contaminated fluid can foul interior surfaces, making it necessary to clean the system prior to charging with new fluid.


  • Fast and Easy : Using Therminol FF to flush your fouled system is faster than chemical cleaning and requires less downtime. This is because you simply drain the old fluid, add Therminol FF and circulate, drain and re-fill with your new heat transfer fluid.
  • Less Costly : Therminol FF is a key component of a low cost alternative to chemically cleaning a heat transfer system containing severely degraded or contaminated organic heat transfer fluid.
  • Compatible With New Fluid : Therminol FF is compatible and miscible with most organic heat transfer fluids, which means less downtime is required for system cleaning.
  • Safety : Therminol FF is a synthetic hydrocarbon with a high flash point and high initial boiling point, making it much safer to use than other cleaning solvents.
  • Effective : To help you decide on the correct clean-out procedure, your Therminol specialist can help you develop the necessary parameters required to maximize the effectiveness of the flushing process.