Antifreezing agent based on monoethylene glycol containing corrosion inhibitors – which have been developed especially for circuit water in cooling and heating systems

The following table shows the antifreeze effect when mixed with water:

ANTIFROST (% bw) water antifreeze effect till specific gravity (at 15°C)
15 % 85 % – 5 °C 1,023
23 % 77 % – 10 °C 1,034
28 % 72 % – 15 °C 1,041
33 % 67 % – 20 °C 1,049
38 % 62 % – 25 °C 1,057
42 % 58 % – 30 °C 1,063

A special hint should be given here to the high buffer alkalinity of ANTIFROST, which prevents formation of acetous oxy acids, which may develop via oxidation by air intruding the circulating system.

Please refrain from mixing of ANTIFROST with other antfreeze agents as well as adding of chemicals (e.g. corrosion inhibitors), because of possible negative impacts.

If a heating system containing ANTIFROST is emptied and refilled with water, it has to be flushed thoroughly, because extremely diluted ANTIFROST solutions tend to have corrosive effects in the long run.

With a decreasing precentage of ANTIFROST corrosion protection declines too – therefore the percentage of ANTIFROST must not drop to less than 23 % bw.

Chemical-physical data

density at 20°C (acc. to DIN 51 757) [g/cm3] 1,11
refraction index (ND at 20°C) (acc. to DIN 51 423) 1,425
buffer alkalinity ml 0,1 normal HCl per 10 g sample(acc. to ASTM-D-1121) 41,7
pH value of undiluted solution (acc. to ASTM-D-1278) 7,3
pH value of aqueous solution 33 vol-% antifreeze agent (acc. to ASTM-D-1278) 8,8
boiling point at 760 torr (acc. to ASTM-D-1120) 198 °C
flash point, closed cup acc. to Pensky-Martens (acc. to ÖNORM C 1122) 110 °C
specific heat at 20 °C [cal/g °C] 0,56
coefficient of heat conductivity at 20 °C [cal/cm.s. °C] 0,00062
cubic coefficient of expansion at 20 °C [1/K] 6,9.10-4

According to ÖNORM H5195-2 system waters of heating or cooling systems, which have been equiped with ANTIFROST, have to be examined in the laboratory periodically (time range 2 years).

An approximate examination of ANTIFROST solutions is possible via measurement of the density (by which the antfreeze effect can be deduced in the table above) and via pH value (which should be between 7 and 9).

The corrosion inhibitors incorporated in ANTIFROST protect iron and aluminium, as well as copper and its alloys; plastic materials like polyethylene and polypropylene (which most of the pipes of underfloor heatings consist of) will not be affected by ANTIFROST either.

Material made of zinc or bearing zinc coated surfaces should not be used, because these kind of metals can be destroyed by glycol containing heat carriers under formation of hydrogen.

Evaluation of corrosion tests carried out with antifreeze agent ANTIFROST according to ASTM-D-1384-70

examined material

(in the so called ASTM metals package)

site-related loss of mass
in gram / m3
at 1000 hours duration of test
Ethylene glycol
without additives
with inhibitor
Copper SF-CU
W.Nr. 2.0090
3.5 1.0
Lot L-PbSn 33
W.Nr. 2.3433
140 3.0
Brass Cu Zn 37
W.Nr. 2.0321
3.5 1.0
Grey cast iron GG-15
W.Nr. 0.6015
475 1.0
Steel RRST-1405
W.Nr. 1.0338.6
110 1.5
Cast aluminium G-AlSi Cu 4
W.Nr: 3.2151
4,5 1.5

The above given values are extracted from an expertise of the Austrian Technical Control Board (TÜV) dating from September 9th, 1983, based on which ANTIFROST got its seal of quality. To maintain this seal that expertise is renewed every three years and it is anew examined, wether ANTIFROST still meets the requirements.

Solutions of ANTIFROST are not allowed to be released to the public sewage system, because they contain ethylene glycol and are therefore (as other antifreeze agents too) hazardous waste – ANTIFROST and ANTIFROST solutions have to be handed over to an approved hazardous waste assembler or hazardous waste eliminator.