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A ready-to-use solution for solar heating systems based on higher boiling glycols

Antifrogen® SOL HT

Antifrogen® SOL HT is a physiologically harmless, yellowish, clear liquid based on an aqueous solution of higher boiling glycols, which is used as a heat transfer medium in solar heating systems, also those exposed to high thermal loads. The product is inhibited without the use of nitrites-, borates-, silicates- and phosphates. It meets the requirements of DIN 4757, part 3, for solar heating systems. The optimization of the corrosion inhibition system was performed without the use of CMR-substances (cancerogenic, mutagenic, reprotoxic).

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  • Based on higher boiling glycols plus anti-corrosion additives
  • Permanent usage temperatures: approx. -23 to +200 °C
  • Premixed with deionized water (frost resistance: approx. -23 °C)
  • Typical applications: Solar heating systems, even highly stressed collectors with vacuum tubes resp. solar heating systems exposed to high thermal loads
  • Water hazard class WGK 1 (slightly water-polluting)
Product details
Product Function
  • Corrosion inhibitor
  • Heat transfer fluids
  • Heating & Cooling

Antifrogen® SOL HT was developed especially for use as a heat transfer medium in solar systems. The product is physiologically harmless.

Service & Monitoring
According to our experience Antifrogen® SOL HT can be used in installations for many years. However, the Antifrogen® SOL HT concentration in the installation should be checked annually. This check is also advisable when the installation is topped up with liquid. The reference source for Brix refractometer and Antifrogen data slider can be provided upon request.
The performance of the Antifrogen® SOL HT should also be checked at intervals of two years. If a 250 ml sample is provided, the distributors can also perform this service. 
Find more information under: Antifrogen Analyse Service (

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Antifrogen® SOL HT

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