An inhibited heat transfer fluid which is designed to protect all solar thermal heating systems at elevated temperatures. This product is effective both in the gaseous and liquid state at temperatures in excess of 180° C.

  • An inhibited heat transfer fluid for all solar thermal applications
  • Frost protection to -28°C
  • Volatile corrosion inhibitor for protection in gas and liquid phases
  • Stable pH across the range of operational temperatures
  • Compatible with all makes and models of solar panels
  • Benchmarked against market leading products


An aqueous solution of monopropylene glycol, and specifically formulated high temperature inhibitors
Appearance: Clear, orange liquid
SG @ 20°C: 1.035
Refractive Index: 1.381-1.385
pH: 9.4 – 10.3
Alkalinity: 6,300 – 6,500 ppm as CaCO3
Viscosity (20°C): 8.5 – 8.7 cPs (Brookfield 100 rpm)
Boiling point: 102 – 105oC
Flash point: None
Water content: 55 – 58%
Freezing point: < -28°C


Packaging, Handling and Storage

Fernox Protector Solar S1 is supplied as a ready-to-use premix in 10, 20 and 25 litre sizes. The formulation should not be diluted prior to use.

Fernox Solar S1 is classified as non-hazardous and non-irritant, but as with all chemicals, keep out of the reach of children. Do not take internally. In case of contact with eyes or skin, rinse immediately with plenty of water.

Refer to Fernox Solar S1 Safety Data Sheet (SDS) for further information.

Please contact the supplier to check availability of stock