Thermal oil solutions you can rely on.
Therminol® 59: a heat transfer fluid with excellent low-temperature pumping characteristics and thermal stability
The synthetic heat transfer fluid Therminol® 59 provides superior pumpability at low temperatures (pumpable at -49°C), ensuring trouble-free starts in cold climates while maintaining thermal stability at a recommended operating temperature of 315°C. Therminol® 59 is available worldwide.
Temperature range
-49° to 315°C
Recommended bulk temp °C
315
Max. film temp °C
345
Boiling point °C @ 1013 mbar
289
Pumpability °C @ 300 mm²/s (cSt)
-37
Pour Point °C
-68
Flash Point °C (ASTM D93)
132
Flash Point °C (ASTM D92)
146
Autoignition Temp °C (DIN 51794)
404
Density @ 20°C (kg/m³)
974
Kinematic viscosity @ 40°C (mm²/s)
4,04
Water Class
WGK 3

Your advantages of using Therminol® 59 in your thermal oil systems
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Heating or cooling operations – Therminol® 59 has a surprisingly low viscosity for a high-temperature heat transfer fluid. It's ideal for combined heating and cooling applications, delivering excellent heat transfer rates even at 20°C. For batch processes, Therminol® 59's exceptional cooling performance is a key advantage.
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Superior low-temperature pumpability – the low viscosity at extremely low temperatures makes it an ideal fluid for northern climates. In fact, Therminol® 59 was originally developed for use in Alaska's North Slope, providing an exceptional test of its low-temperature pumpability.
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Long life means low costs – operators of thermal oil systems can count on years of reliable, trouble-free operation, even when Therminol® 59 is continuously operated at its recommended maximum temperature of 315°C. A long service life means fewer fluid changes, translating into lower operating costs – a critical advantage in today's competitive business environment.
Discover a wide range of the most common applications for Therminol® 59:
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Oil and gas processing
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Natural gas purification
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Gas-to-liquid (GTL) applications
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Plastics and polymer manufacturing
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Plastic injection molding
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Specialty chemical production
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Organic rankine cycle (ORC)
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Biofuel production
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Water desalination
Increase your Therminol® 59 knowledge with our comprehensive resources:
- Therminol 59 Safety Data Sheet (DE)
- Therminol 59 Safety Data Sheet (EN)
- Therminol 59 Safety Data Sheet (IT)
- Therminol 59 Safety Data Sheet (PL)
- Therminol 59 Technical Data Sheet (EN)
- Therminol 59 Product Information (EN)
- Therminol Medium Temperature heat transfer fluids (EN)
- Therminol Wärmeträgeröle Produktübersicht (DE)
- Therminol Heat Transfer Fluids selection guide (EN)
- Heat Transfer Fluids – Mehr als 50 Jahre erfolgreiches Temperaturmanagement (DE)
- Heat Transfer Fluids – More than 50 Years of Experience in Managing Temperature (EN)
- Thermoölanlagen sicher und effizient betreiben – White Paper (DE)
- Operating Thermal Oil Plants safely and reliably – White Paper (EN)