Therminol® LT Heat Transfer Fluid
Description
Therminol LT is a synthetic aromatic heat transfer fluid. It can be used in both liquid phase and vapour phase, and has excellent heat transfer and fluid properties for low temperature applications.
Performance Benefits
- Vapour Phase Operation—Therminol LT can be used in the liquid phase between -75°C (-100°F) and 315°C (600°F). With a boiling point of 181°C (358°F) at ambient pressure, Therminol LT can be used in the vapour-phase above 181°C (358°F).
- Excellent Low-Temperature Performance—Therminol LT has the best low-temperature heat transfer coefficient of all coolant fluids. Therminol LT has excellent heat transfer properties to -75°C (-100°F).
- Low Viscosity—Low viscosity at exceptionally low temperatures makes Therminol LT excellent for pumping extreme cooling applications.
Typical Properties
| Property | Test Method | Typical Value, Units |
| Appearance | Clear, light yellow liquid | |
| Composition | Alkyl substituted aromatic | |
| Recommended Bulk Temperature | 315 °C (600 °F) | |
| Maximum Film Temperature | 345 °C (650 °F) | |
| Normal Boiling Point | 181 °C (358 °F) | |
| Pumpability @300 mm2/s (cSt) | -75 °C (-103 °F) | |
| Crystallization Point | 75 °C (-103 °F) | |
| Autoignition Temperature | ASTM E659 DIN 51794 | 412 °C (774 °F) 429 °C (804 °F) |
| Coefficient of thermal expansion @ 100°C | 0.001080 /°C (0.000600 /°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) | -66 °C (-87 °F) <-73 °C (-100 °F) | |
| Minimum vapor 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) | 139 °C (283 °F) 116 °C (241 °F) | |
| Heat of Vaporisationa | 223 kJ/kg (95.7 Btu/lb) | |
| Viscosity, Kinematic @100ºC @ 40°C | ASTM D 445 ASTM D 445 | 0.48 cSt, mm2/s 0.81 cSt, mm2/s |
| Molecular Weight (Average) | 134 | |
| Pseudocritical temperature | 377 °C (710 °F) | |
| Pseudocritical pressure | 34.5 bar (500 psia) | |
| Pseudocritical density | 298 kg/m3 (2.49 lb/ft3) | |
| Dielectric Constant @ 23°C | ASTM D-924 | 2.3 |
| Moisture Content, maximum | ASTM E-203 | 80 ppm |
| Surface Tensionb @ 25°C | 28.0 dynes/cm |
Key Attributes
- Vapour Phase Operation
- Low Viscosity
- Excellent Low Temperature Performance
Applications
- htf – active pharmaceutical ingredients
- htf – fine chemicals
- htf – pharmaceutical processing
- Environmental test chambers
- Fibers
- Formaldehyde
- Specialty and batch chemical production
- Specialty chemicals