Lubricants and Heat Transfer FluidsSolutions for Applications
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Heat Transfer Fluids

Phone: +49 (0)208-300 02-50
Fax: +49 (0)208-300 02-33


Phone: +49 (0)208-300 02-40
Fax: +49 (0)208-300 02-77


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Ready-to-use special heat transfer fluid for solar plants based on 1,2-propylene glycol

FRAGOLTHERM® W-VR is an aqueous heat transfer fluid based on propylene glycol that is used in a range of -28 °C to 200 °C.

Application Area


The content of corrosion inhibitors in FRAGOLTHERM® W-VR protects all metal materials conventionally used in solar technology and mixing installations on a long-term and reliable basis against corrosion, ageing and incrustation. FRAGOLTHERM® W-VR keeps the heat transfer surfaces clean and in this way guarantees a consistently high degree of efficiency of the plant to be protected.

If the following conditions are observed, FRAGOLTHERM® W-VR can be used in solar plants that reach standstill temperatures of up to 320 °C:

  • Prior to reaching the maximum standstill temperature, it must be possible to fully discharge the FRAGOLTHERM® W-VR present in the collectors at the start of the stagnation state by means of evaporation, and capture this in the expansion tank.
  • FRAGOLTHERM® W-VR must not be exposed to constant temperatures of more than 170 °C.

Temperatures above 200 °C lead to a slow thermal decomposition of the 1.2 propylene glycol that can be detected by dark colouration of the heat transfer fluid. This can severely reduce the service life of the medium.

Technical Data

Heat transfer fluids business unit

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