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Anti-freeze and anti-corrosion liquid WATERDOS FKN-28 5kg for heating and solar installation
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23812
Frost protection and corrosion for closed central heating, cooling and solar systems
Purpose of use of WATERDOS FKN-28
Waterdos FKN 28 has a proven protection formula against freezing and corrosion for closed loop water central heating systems and meets the VDI 2035 requirements. It is also ideally suited for cooling circuits, solar collectors, and heat pumps. Waterdos FKN 28 contains components which stabilize the hardness and cleans (dispersants) the liquid.
Advantages of WATERDOS FKN-28 anti-freeze and anti-corrosion protection liquid
- effective anti-corrosion for iron, cast iron, cast iron alloy, copper, aluminum-copper alloy, solder alloy by creating a protective layer on the metal surface, both in homogeneous and mixed systems in terms of used materials.
- contains anodic and cathodic inhibitors, which slow down the chemical reactions of oxidation
- very good buffering properties (acceptable range 7.0-8.5 pH)
- dispersing of corrosive particles, allowing to maintain the purity of the surface of the equipment and the liquid itself
- stabilizing the hardness of water (eliminating the deposition of calcium)
- lack of hydrazine and nitrate, which is more environmentally friendly
- neutral to the applied seals (EPDM, NBR, PB, PP, PTFE, VPE, hydraulic hemp, butyl rubber, polyacrylate, and polycarbonate)
WATERDOS FKN-28 anti-freeze and anti-corrosion liquid properties
Waterdos FKN-28 is a yellow color liquid with density of 1.12 ± 0.03 g/cm3 (at temp. 20 °C) and a pH (1%) 8.6 ± 0.2 and a temperature freezing point of -150 °C
WATERDOS FKN-28 anti-freeze and anti-corrosion liquid changing and dosing
The dosage of Waterdos FKN 28 depends on the quality of the water inlet and the required frost protection. Generally, the dosage is between 20-50% the capacity of the unit (see table). Dosing occurs manually by means of the inlet gate, a hand pump or electric pump (if possible before the system circulation pump).
Liquid mixing depends on the system used hydraulic equipment and can take up to 14 days. For effective and hassle-free use, at least once a year, checking the content of the mixed liquid for pH levels, density and the inhibitor content is prior to maintaining the antifreeze and anti-corrosion capabilities. In the case of deviation from the required value, the need to fill the gaps of the fluid in the system is obligatory. If a larger closed loop system or industrial systems are in use it is advisable to consult the engineers.
| Volume [ % ] | Weight FSK [ % ] | Density [ g/cm3 ] | Protection [ °C ] |
| 20 | 22,5 | 1,03 | -10 |
| 25 | 30 | 1,04 | -14 |
| 30 | 33,5 | 1,04 | -18 |
| 35 | 39 | 1,05 | -22 at a lower temperature. bursting does not occur |
| 40 | 44,5 | 1,06 | -27 at a lower temperature. bursting does not occur |
| 45 | 50 | 1,06 | -33 at a lower temperature. bursting does not occur |
| 50 | 55,5 | 1,07 | -40 at a lower temperature. bursting does not occur |
| * The values given for Waterdos FKN-28 density preparation - 1,115g / cm3 at 20 °C. | |||
WATERDOS FKN-28 installation tips
Conditioning design, crevice corrosion, and erosion can not always be avoided. For reasons of chemical corrosion the maximum concentration of the liquid concentrate can not exceed more than 20%.
Direct contact of copper with aluminum is not allowed.
When changing the installation medium from water and anti-freeze agent to water, attention must be drawn to the total removal of the antifreeze liquid (rinsed out). Otherwise, there the risk occurs that residues of organic acids will decompose and act corrosively. Waterdos inhibitor should also be applied and at least for one year a water content measurement for pH and inhibitor presence should be carried out.
When pH drops below 7, flushing the system with a Passivator NEU 04 inhibitor is a common practice with refilling afterward.
The limit of WATERDOS FKN-28 is approx. 68% concentration of the mixture of water, which corresponds to the freezing temperature setpoint of approx. -68 °C.
Data sheet
| Weight [ kg ] | 5.0 |
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