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Appendix
5.4 Approved corrosion inhibitors and anti-freeze fluids for central heating water
Manufacturer Description Remarks
Mixing
concentra–
tion % by
weight
With all anti-freeze fluids and corrosion inhibitors, it is extremely important to observe the manufacturer’s recom-
mended concentration levels and to check the concentration regularly.
In the case of anti-freeze fluids, it should be noted that the efficiency of fluid-to-fluid heat transfer diminishes as
the anti-freeze concentration increases.
Anti-freeze fluid
Hüls Ilexan E Anti-freeze fluid, equivalent to Antifrogen N.
Tyforop Chemie
GmbH, Hamburg
Tyfocor L Anti-freeze fluid based on propylene glycol. 25-80
Schilling Chemie Varidos FSK Anti-freeze fluid based on ethylene glycol with
good corrosion-inhibiting properties. Also suitable
for aluminium.
22-55
Hoechst Antifrogen N Anti-freeze fluid based on ethylene glycol with
good corrosion-inhibiting properties.
20-40
Fernox Alphi-11 Anti-freeze fluid with corrosion inhibitor, also suit-
able for aluminium.
BASF Glythermin NF Anti-freeze fluid based on ethylene glycol with
good corrosion-inhibiting properties, also suitable
for aluminium.
20-62
Corrosion inhibitor
Schilling Chemie Varidos KK Corrosion inhibitor 0,5
Schilling Chemie Varidos 1+1 Corrosion inhibitor 1-2
Schilling Chemie Varidos AP Corrosion inhibitor, also suitable for aluminium. 1-2
Benckiser
Wassertechnik
Randophos HS
Universal
Corrosion inhibitor
Geminox,
Frankreich
Inibal Corrosion inhibitor, suitable for aluminium. 1-2
Betz Dearborn,
Belgien
Sentinel X 100 Corrosion inhibitor for hot water heating systems,
also suitable for aluminium.
1,1
Fernox Copal Corrosion inhibitor, also suitable for aluminium. 1
Cillit Wassertechnik Cillit-HS Combi Corrosion inhibitor 0,5
Other additives
Fernox Restorer Superfloc
Universal Cleanser
Cleaning agent (for sludge removal), also suitable
for aluminium.
1-2
Fernox Superconcentrate
Central heating
Protector
Reduces limescale precipitation, also suitable for
aluminium.
Table 8
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