Therminol® 66 Heat Transfer Fluid
Description
Therminol 66 is the world’s most popular high-temperature, liquid-phase heat transfer fluid. Therminol 66 is pumpable at low temperatures, and offers high temperature thermal stability.
Performance Benefits
- Experience—Therminol 66 is the most popular high-temperature, liquid-phase heat transfer fluid.
- Proven Fluid—In a wide variety of applications and thousands of systems around the world, Therminol 66 delivers excellent performance.
- True 650° F (345° C) Performance—Therminol 66 sets the performance standard for high-temperature, liquid-phase fluids. Users can expect many years of reliable, trouble-free operation even when operating continuously at the recommended bulk temperature.
- Fouling Resistant—Therminol 66 is specifically engineered to resist solids formation and system fouling, providing more reliable operation and potential cost savings.
Typical Properties
| Property | Test Method | Typical Value, Units |
| Appearance | Clear, pale yellow liquid | |
| Composition | Modified terphenyl | |
| Recommended Bulk Temperature | 345 °C (650 °F) | |
| Maximum Film Temperature | 375 °C (705 °F) | |
| Normal Boiling Point | 359 °C (678 °F) | |
| Pumpability @300 mm2/s (cSt) @ 2000 mm2/s (cSt) | 11 °C (52 °F) -3 °C (27 °F) | |
| Flash Point COC PMCC | ASTM D92 ASTM D93 | 184 °C (363 °F) 170 °C (338 °F) |
| Autoignition Temperature | ASTM E659 DIN 51794 | 374 °C (705 °F) 399 °C (750 °F) |
| Pour Point | ISO 3016 | -32 °C (-25 °F) |
| Minimum liquid temperatures for fully developed turbulent flow (NRe > 10000) 10 ft/s, 1-in. tube (3.048 m/s, 2.54-cm tube) 20 ft/s, 1-in. tube (6.096 m/s, 2.54-cm tube) | 35 °C (96 °F) 26 °C (78 °F) | |
| Coefficient of thermal expansion @ 200°C | 0.000819 /°C (0.000455 /°F) | |
| Viscosity, Kinematic @ 100°C @ 40°C | ASTM D 445 ASTM D 445 | 3.80 cSt, mm2/s 29.6 cSt, mm2/s |
| Liquid Density @ 15°C @ 25°C | ASTM D 4052 ASTM D 4052 | 1012 kg/m3 (8.44 lb/gal) 1005 kg/m3 (8.4 lb/gal) |
| Acidity | ASTM D 664 | <0.2 mg KOH/g |
| Molecular Weight (Average) | 252 | |
| Pseudocritical temperature | 569 °C (1056 °F) | |
| Pseudocritical pressure | 24.3 bar (353 psia) | |
| Pseudocritical density | 317 kg/m3 (19.8 lb/ft3) | |
| Copper Corrosion | ASTM D 130 | <<1a |
| Moisture Content, maximum | ASTM E-203 | 150 ppm |
| Dielectric Constant @ 23°C | ASTM D-924 | 2.61 |
Key Attributes
- Experience
- Fouling Resistant
- Proven Fluid
- True 650ºF (345º C) Performance
Applications
- htf – aluminum foil printing
- htf – bakery
- htf – detergent
- htf – fine chemicals
- htf – food/feed/beverage processing
- htf – production of bioalcohol
- htf – production of biodiesel
- Abs
- Adhesives
- Biomass – orc
- Cement – waste heat recovery + orc
- Chemicals & petrochemicals
- Desalination
- Fibers
- Glass – waste heat recovery + orc
- Hybrid solar + orc
- Oil or gas processing
- Oil recycling
- Polyester (pet)
- Polyethylene
- Polymer & plastic
- Polypropylene
- Refining
- Resins
- Silicone
- Solar csp
- Specialty chemicals
- Styrene
- Tall oil