High thermal stability
Benefits of ScaleAway21/12 concentrate Descaling Agent
Ecology & Toxicology
The excellent ecological and toxicological properties of ScaleAway21/12 concentrate, make it the best bio-degradable non toxic descaling
agent available on the South African market. Industrial Piping Solutions has therefore positioned ScaleAway21/12 concentrate as the
primary replacement for other, less environmentally friendly complexing agents such as phosphates, phosphonates, zeolites
and silicates, etc. ScaleAway21/12 concentrate is the best choice from an environmental point of view because it has the lowest
biochemical oxygen demand of all the compounds in this group.
High Acid Strength
The strength of acids has a profound influence on their effectiveness in chelating formulations. For instance, when
lime-scale is dissolved, the insoluble CaCO³ reacts with the protons that are contained in the solution to form carbon
dioxide, water and the calcium salt of the acid, which is expected to be soluble. The extent to which the acid
dissociates – or, in other words, the acid strength – plays a decisive part in the dissolving process, because the
process is more efficient if more protons are available in the solution. The law of mass action defines the acid
strength. The equilibrium constant is obtained by applying the law of mass action to the dissociation reaction:
the higher the figure for the equilibrium constant, the stronger the acid.
High Soluble Salts
For the descaling processes to be effective, it is very important that the salts that are formed as the result of
dissolving precipitates with acid are highly soluble.
Precipitated calcium carbonate can disfigure metal surfaces, block pipes and cause machinery to overheat and
malfunction. ScaleAway21/12 concentrate is very effective for removing calcium carbonate scale from the water side of all equipment.
The miscibility and stability of ScaleAway21/12 concentrate is excellent, even in highly acidic solutions. Many complexing agents
cannot be employed in acidic formulations because they precipitate in the form of their sparingly soluble free acids.
ScaleAway21/12 concentrate has the advantage that it remains soluble and chemically stable, even in the acidic pH range.
Scale Types dissolved and inhibited by ScaleAway21/12 concentrate
Inorganic Scale - Alkali earth cations such as calcium and magnesium and inorganic anions such as carbonate and
phosphate are present in virtually all aqueous systems. Their salts form scale that can disrupt many industrial
processes.
Dissolving Calcium Carbonate Scale - The equilibrium of the reaction by which scale forms has to be displaced in favour
of the soluble species in order for the scale to dissolve. ScaleAway21/12 concentrate has a very high calcium binding power, which
enables it to dissolve existing calcium scale and to prevent new scale from forming
Dissolving calcium phosphate scale - Calcium phosphate also forms scale that is difficult to dissolve. This type of
scale is often encountered in applications in which high concentrations of phosphate are present. Scale often gives rise
to problems in dairies, because milk contains high concentrations of calcium phosphate and this sparingly soluble salt
precipitates when milk is processed.
ScaleAway21/12 concentrate is the best choice when it comes to finding a readily biodegradable complexing agent for dissolving calcium
phosphate scale.
ScaleAway21/12 concentrate is very effective for dissolving the scale formed by lime soaps and preventing scale from building up.
Weak complexing agents such as IDS or HEIDA cannot be used to remove calcium scale effectively.
Included in the ScaleAway21/12 concentrate proprietary formula, is a corrosion inhibitor used to protect the underlying metal when
scale and oxide deposits are removed from metal parts. It also prevents the underlying metal from being corroded without
interfering in the scale removal process.
ScaleAway21/12 concentrate is also very effective in cases in which very uneven deposits need to be removed. The descaling solution is
circulated to increase the rate at which the scale is removed. The duration of the process depends on the thickness of
the deposits and the accessibility of the steel surfaces to be treated in oil coolers and heat exchangers, etc.
Health & Safety
We know of NO ill effects that could have resulted from using ScaleAway21/12 concentrate for the purpose for which it is intended
and from processing it in accordance with current practice.
According to the experience we have gained over many years and other information at our disposal, ScaleAway21/12 concentrate does not
exert any harmful effects on health, provided that it is used properly,
Conclusion
Because ScaleAway21/12 concentrate is an eco friendly bio-degradable product, it is fast replacing all previous aggressive hydrochloric
acid and EDTA based descalers.
ScaleAway21/12 concentrate is described as being a “green acid” because of its ecological advantages
ScaleAway21/12 concentrate is the best choice when it comes to using a readily biodegradable complexing agent for dissolving
limescale in the water end of all industrial machinery.
Completion of descaling should be determined by either testing acidity or pH periodically. When
descaling is complete acidity or pH should be constant. If solution shows no acidity or pH
rises to 4 or higher then more ScaleAway21/12 concentrate solution is added.
After completion of descaling, equipment is drained and flushed thoroughly with water.
The management of limescale and rust from the waterside of your equipment and
associated piping with ScaleAway21/12 concentrate descaler is of paramount importance for the efficiency and lifespan of your equipment.
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Contact us TODAY to purchase industrial grade descaling chemicals or to discuss a water management solution for your specific application!
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