HR Synthetic-aromatic Thermal Fluid
HR synthetic-aromatic heat transfer fluid is an alkylated-aromatic based heat transfer fluid formulated for closed-loop liquid phase heating to 650°F in fired heaters and 675°F in waste heat recovery and full convection heaters. HR synthetic-aromatic thermal fluid offers greater thermal stability than competitive aromatic based fluids that cover similar temperature ranges. Testing (ASTM D6743) shows that, compared to its closest competitor, HR synthetic-aromatic heat transfer fluid experiences 1/2 the amount of fluid degradation when maintained at 700°F for 500 hours. Less degradation means less maintenance and a longer fluid life. Centrifugal pumps are generally specified around the fluid viscosity at the desired operating temperature (usually less than 2 cps). Capacity falls off significantly above 300 cps. So the actual minimum start-up temperature of a fluid is where the viscosity curve crosses the 300 cps line. HR Synthetic-Aromatic Heat Transfer Fluid’s lower cold start-up temperature of 13°F (-11°C) offers a significant advantage over other high-temperature fluids.
OPERATING RANGE
| Minimum Startup Temp (300cSt) | Maximum Operating Temp |
|---|---|
| 11°F / -12°C | 675°F / 357°C |
FEATURES
- Best in class thermal stability and heat transfer efficiency
- Widest operating range
- Unique formulation resists thermal decomposition at high temps
APPLICATIONS INCLUDE
Note: If you are experiencing short supply, or long lead times for your currently specified synthetic/aromatic 650°F (terphenyl or alkylated aromatic) heat transfer fluid, call Paratherm for a point-by-point comparison of physical properties. We have product available, and may have just the fluid for your application. +1 (610) 860-6323. Or, use the links on the left side of this page to compare properties with Therminol 66.
COMPARISON OF PARATHERM HR WITH THERMINOL 66*
| Property | Paratherm HR | Therminol 66 |
|---|---|---|
| Chemical Composition | Alkylated Aromatic | Modified Terphenyl |
| Maximum Operating Temperature | 650°F (343ºC) | 650°F (343°C) |
| Maximum Film Temperature | 700°F (371 C) | 705°F (374°C) |
| Minimum Start-up Temp (300 cSt) | 11.0°F (-12°C) | 52.0°F (11°C) |
| Kinematic Viscosity @ 40 C | 11.0 cSt | 29.6 cSt |
| Kinematic Viscosity @ 100 C | 2.4 cSt | 3.8 cSt |
| Density @ 25 C | 7.98 lb/gal (956 kg/m3) | 8.39 lb/gal (1005 kg/m3) |
| **Degree of Decomposition (ASTM D6743) | 0.15 | 0.56 |
*Therminol 66 is a trademark of Solutia Inc.
**The Degree of Decomposition, measured through ASTM D6743, reflects the overall thermal degradation of a thermally stressed fluid at a specific test temperature. It is determined by adding the total mass percentage of all decomposed products found in a thermally stressed sample. These values were found after both fluids were tested side-by-side at 370ºC (698ºF) for 500 continuous hours. A lower Degree of Decomposition reflects superior relative Thermal Stability of a fluid.
Paratherm™ HR Synthetic-Aromatic HTF
TYPICAL PROPERTIES*
| Chemical Name | Alkylated Aromatic |
| Appearance | Colorless |
| Odor | Slight Odor |
| Maximum Recommended FilmTemperature | 700°F / 371°C |
| Maximum Recommended Oper. Temperature-Fired Heaters | 650°F / 343°C |
| Maximum Recommended Oper. Temperature-All Others | 675°F / 357°C |
| Minimum OperatingTemperature 20cPs (20 mPa-s) | 78°F / 26°C |
| Minimum Start-upTemperature 300cPs (300 mPa-s) | 11°F / -12°C |
| Viscosity @ 60°F / 15.5°C cSt (mm2//sec) | 36 |
| Density @ 60°F / 15.5°Clb/gal (kg/m3) | 8 (964) |
| Flash Point Pensky-Martens Closed Cup (D-93) | >300°F (149°C) |
| Autoignition Temperature (Maximum 10 second ignition delay) | >780°F/416°C) |
| Boiling Point (14.7 psia/101 kPa) | 638°F/337°C |
| Vapor Pressure @ Maximum operating temp psia (kPa) | 28.8/195 |
| % Volume expansion over recommended operating temperature per 100°F (°C) | 5.5 (9.9) |
| Average Molecular Weight | 240 |
