| Appearance | Clear, water white liquid |
| Composition | Biphenyl/diphenyl oxide (DPO), Eutectic Mixture |
| Maximum bulk temperature | 400°C /750°F |
| Maximum film temperature | 430°C / 800°F |
| Normal Boiling Point | 257°C / 495°F |
| Crystallization Point | 12°C / 54°F |
| Flash Point | |
| COC (ASTM D92) | 124°C / 255°F |
| PMCC (ASTM D93) | 110°C / 230 °F |
| Autoignition Temperature (ASTM E659) | 601°C /1114 °F |
| Autoignition Temperature (DIN 51794) | 621°C/1150 °F |
| Coefficient of thermal expansion @200°C | 0.000979 /°C (0.000544 /°F) |
| Heat of Vaporization* | 206 kJ/kg (88.7 Btu/lb) |
| Kinematic Viscosity | |
| at 100°C/ 212°F (ASTM D 445) | 0.99 cSt, mm2/s |
| at 40°C/ 104°F (ASTM D 445) | 2.48 cSt, mm2/s |
| Liquid Density | |
| at 15°C (ASTM D 4052) | 1068 kg/m3 (8.91 lb/gal) |
| at 25°C (ASTM D 4052) | 1060 kg/m3 (8.85 lb/gal) |
| Acidity, ASTM D 664 | <0.2 mg KOH/g |
| Average Molecular Weight | 166 |
| Pseudocritical temperature | 499°C / 930 °F |
| Pseudocritical pressure | 33.1 bar (480 psia) |
| Pseudocritical density | 327 kg/m3 (20.4 lb/ft3) |
| Sulfur Content (ASTM D-7691) | <10 ppm |
| Copper Corrosion (ASTM D 130) | <<1a |
| Max. Moisture Content (ASTM E-203) | 300 ppm |
| Volume contraction upon freezing | 6.27% |
| Volume expansion upon melting | 6.69% |
| Surface Tension (25°C)** | 36.6 dynes/cm |
| Dielectric Constant (23°C), ASTM D-924 | 3.35 |
RELATHERM UHT Ultra-High Temperature Heat Transfer Fluid
Well proven synthetic thermal fluid chemically equivalent to Therminol® VP-1 and Dowtherm® A. It is a eutectic mixture of Diphenyl Oxide (DPO) and Biphenyl. A liquid-gas phase heat transfer fluid designed for ultra-high temperature applications, it maintains excellent thermal stability and pumpability over its specified bandwidth . It is a cost-effective alternative to name-brand aromatic fluids of the same chemistry.
PRODUCT SUMMARY
- Maximum use temperature: 400ºC / 750°F
- Flash Point: 124ºC / 255°F
- Resistant to fouling and solids/coke formation
- Excellent thermal stability
- Top-off compatible with Therminol® VP-1 and Dowtherm® A. No flush required.
Technical Documents
Physical Properties
Additional Information
WHY RELATHERM UHT?
Relatherm UHT is one of the most stable heat transfer fluids in the industry. It maintains excellent thermal properties at ultra-high process temperatures, providing dependable and trouble-free equipment operation. It can be used as a liquid heat transfer fluid or as a boiling-condensing heat transfer fluid up to 400ºC / 750°F in applications requiring very precise temperature control.
COMPREHENSIVE PRODUCT PORTFOLIO
If Relatherm UHT does not meet your application requirements, there is a very good chance that we will be able to offer a better suited solution from our comprehensive portfolio of thermal fluids and system cleaners. Contact us to discuss your application with a Thermal Fluids Expert.
MAXIMUM OXIDATION RESISTANCE
Relatherm UHT provides a very high level of resistance to oxidation and greatly minimizes sludge format and the fouling of heat transfer surfaces.
For this reason, Relatherm UHT provides lower maintenance costs, longer uptime and less frequent fluid changeouts.
EXTENDED FLUID LIFE
Relatherm UHT is well known for it extended service life, even in oxidation-prone systems. Its superior base chemistry extends its usability under operating conditions at which other industry fluids would typically degrade.