Glycols for cooling, air conditioning, and heating technology

Glysofor Solar AF


Glysofor Solar AF is an environmentally friendly solar fluid based on propylene glycol in combination with corrosion inhibitors and stabilisers.

Glysofor Solar AF fulfils the requirements of DIN 4757 Part 3 or DIN EN 12975 for solarthermal plants. Glysofor Solar AF is used in both vacuum tube solar plants and plate collector solar plants.

Due to its physiological and ecological harmlessness, it can be used both in the food and beverage sector as well as in pharmaceutically and ecologically sensitive areas of application.

Glysofor Solar AF can be used as a frost protection agent, an anticorrosive agent and a heat transfer medium.

Glysofor Solar AF

Typical areas of application

Vacuum tube solar plants and plate collector solar plants

Packaging sizes

  • 25 kg / 30 kg PE canister
  • 220 kg Barrel
  • 1.000 kg IBC
  • 24.000 kg Tank vehicle


The thermodynamic properties and other specific product features available to download in PDF format.

Antifreeze protection

Glysofor Solar AF is delivered ready for use and offers a reliable antifreeze protection up to:

-28 °C

Glysofor AF optimally prevents frost damage, corrosion, debris, accumulation of mud or biofilms. With a glycol base - in this case monopropylene glycol - the freezing point of Glysofor Solar AF is significantly lowered, thus ensuring that solar systems can be safely operated even at minus temperatures. If any damage occurs to the system, a simultaneous frost-related explosive effect can be reliably prevented using Glysofor Solar AF. Thanks to a complex combination of anticorrosion additives, metals are optimally protected against corrosive attacks. This anticorrosive protection can be used for all important metals that are usually used in solar installations. Installations made of copper, brass, solder, grey iron, aluminium, steel and iron are optimally protected, even if they are used in multi-metal installations. Glysofor Solar AF is completely free of nitrites, amines, phosphates, silicates and borates. It is biodegradable and environmentally friendly. Glysofor Solar AF is resistant in the long-term against the formation of biofilms, putrescence and microbiological degradation, thus preventing precipitations and the accumulation of mud. Glysofor Solar AF does not separate, even during prolonged plant shutdowns. This guarantees a year-round, long-term and low-maintenance operation of plants that have been filled with Glysofor Solar. Glysofor Solar AF is delivered ready to be filled in, with a frost protection value of -28 degrees C.

As per the valid national and international classification guidelines, Glysofor Solar AF is not a hazardous substance. There is no toxic effect from the concentrate, nor from its dilution. The product is odourless and dermatologically safe. No irritation occurs that can lead to inflammation of the skin or mucous membrane. Glysofor Solar AF is free of nitrites, phosphates and amines. The raw materials contained in this product possess the highest possible degree of purity. Glysofor Solar AF is formulated on a 1.2 propylene glycol base, which fulfils the requirements of the DAB as well as the European Pharmacopoeia and the US Pharmacopeia. As an additive, 1.2 propylene glycol has been approved as per the Ordinance on Additives in Foodstuffs (effective 10/07/1984) as a solvent and extraction agent (BGB1.I S897, Enc. 2, List 9). In the USA, propylene glycol is categorised as a generally harmless food additive (Federal Register, Effective 01/04/1985, § 184.1666). Glysofor Solar AF, and its dilutions, are readily biodegradable. Glysofor Solar AF is classified in the lowest water pollution class WPC 1 (slightly hazardous to water). No workplace-related safety measures are necessary when handling this product. Glysofor Solar AF is non-flammable; it has not been classified in one of the hazard classes for flammable liquids. Glysofor Solar AF is not subject to labelling and not considered a hazardous substance in the national / international transport regulations. The delivery container consists of homogeneous PE and can be recycled after use. The product should be stored in a sealed state at all times. Due to the existing, extremely high level of purity, the product should not be decanted or contaminated with other substances.

Chemical name 1.2 propylene and higher glycols, Aqua Dest., anticorrosion additives
Appearance Yellow liquid
Packaging Canisters / barrels / IBCs / tank vehicles
ADR KI 0 Ziff
Labelling omitted
Density 1,03 g/cm3
Freezing point -28 °C
Specific heat 3,54 kJ/kg K (at 20 °C)
Thermal cond. 0,365 W/mK (at 20 °C)

Galvanised components are to be avoided, as zinc is generally volatile with glycol and products which contain glycol. Pipe connections are to be made of hard solder and chloride-containing flux materials are to be avoided or are to be removed completely by flushing after usage. Scalings on copper components, metal swarf and contaminations are to be removed completely before the plant is filled. Plants that are to be operated with Glysofor must not be in contact with any external electrical potential. When installing the plant, it must be ensured that the future operation is not interrupted by circulatory disturbances caused by air cushions or debris. Plants that are operated with Glycogard must be installed as closed systems and are to be filled completely and vented directly after the pressure test is carried out. Gas and air cushions are to be removed immediately. Breathers are to be applied in such a way that they keep the system free from air and oxygen at all times and that, in the case of low pressure, no air can be sucked in. If an existing plant is to be filled with Glysofor, the corrosion status should be checked beforehand. Before a system that is damaged by corrosion is filled, it must be completely reconstructed. In order to ensure a sufficient level of functionality and frost protection at all times, the condition and concentration of Glysofor Solar AF should be tested at least once per year. This is particularly advisable if work has been carried out on the operated system or the liquid has been refilled. Overheating must be avoided, as this can lead to damage and the premature ageing of Glysofor Solar AF.

Other information

Pure water/glycol mixtures have very distinctive corrosive properties. You must therefore never use pure water/glycol mixtures without inhibitor equipment.

Glysofor Solar AF is delivered ready for use and offers a reliable antifreeze protection up to -28 degrees Celsius.

As an alternative to a product that is pre-ready to be filled in, Glysofor Solar is also available as a concentrate. Our products Glysofor N and Glysofor L are available for other areas of application.

Any questions?

Our products are used in heating systems, air conditioners, industrial and cooling plants, heating pumps, solar plants, sprinkler systems and other systems which carry liquids.
We advise you free of charge and without obligation, so that you receive the best product for your application.