Servo DUOTHERM S is an amalgamation of two compounds, Diphenyl Oxide and Biphenyl. The oil is used as a liquid medium in various heat transfer systems for secondary heating in different industries. The product can be used in vapor and liquid phases. It is also utilized in linear Fresnel units, solar energy generation, trough-based systems, and mainly in parabolic concentrators. It has attained Abengoa specifications, so the product is recommended to be used in solar power plants. It is applicable for usage in heat transfer systems up to a maximum temperature of 400 degrees Celsius.
| Kinematic Viscosity cSt @ 40°C | 2.4-2.6 |
| Atmospheric Boiling Point, deg C | 255-259 |
| Specific Gravity @ 25 deg C | 1.050-1.070 |
| Pour Point, °C, max. | 12 |
| Moisture, ppm, max | 300 |