The DISCAL - series was developed as hardness stabilizer for use in Cooling systems.
It prevents mainly the precipitation of calcium carbonate and has excellent dispersing effect with salts of low solubility, such as calcium sulfate, calcium oxalate and magnesium hydroxide.
The use of DISCAL 54P is designed for Cooling systems with high degrees of hardness (RYZNAR index < 4).
So DISCAL 54P shows even at low doses and under difficult conditions (90 °C and 500 ppm CaCO3) excellent anti-scaling and dispersing properties.
In particularly high content of calcium ions and high alkalinityDISCAL 54 P can not prevent the precipitation of calcium carbonate, but can cause the formation of amorphous crystal structures, which are finely dispersed present and will not cause any build up of disposits.
This advantage makes DISCAL 54P effectively in open cooling systems with very hot surfaces.
Due to the fact, that the amorphous precipitated calcium cristals were not homogeneous present in the system, it may cause a apparent loss of calcium in the analysis to a up to a level of 25 - 30% of the theoretical value.
DISCAL 54 P has got, even at high temperatures and pH values, excellent stabilizing properties.
Compliance with the correct concentration of DISCAL 54P guarantees covering free heat exchanger surfaces in the cooling system.
A practical example shows that a corrosion rate of 0.4 - 0.7 is easily accessible at the following water composition:
500 ppm Ca2+ as CaCO3
500 ppm Mg2+ as CaCO3
250 ppm m-alkalinity as CaCO3
28 ppm DISCAL 54 P
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