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7.2
Limitations on aqueous cleaners
Do not use aqueous cleaning media with pH values in the acid range (pH < 7) directly in the
ultrasonic tank if fluoride (Fˉ), chloride (Clˉ) or bromide (Brˉ) ions can be taken in by the removed
dirt or through the cleaning chemical. These can destroy the stainless-steel tank by crevice
corrosion within a very short period of ultrasonic operation.
Acids and alkaline solutions
Other media which can destroy the stainless-steel tanks when used in high concentrations or with
high temperatures during ultrasonic operation are: hydrochloric acid, nitric acid, sulphuric acid,
formic acid, hydrofluoric acid (even diluted). (Completeness of list not guaranteed.)
Risk of damage to the unit: do not use cleaning solutions containing more than 0.5 mass % alkali
(KOH and/or NaOH) in an ultrasonic cleaning tank.
Entrainment of chemical substances
The above limitations for the use of chemicals in an ultrasonic bath also apply for the
aforementioned chemicals when these are brought into an aqueous (particularly distilled water)
bath through entrainment or from the removed dirt.
Disinfectants
The limitations of use also apply to the standard cleaners and disinfectants if these contain the
above mentioned compounds.
Safety regulations
Observe the safety warnings indicated by the manufacturer of the chemicals (e.g. goggles, gloves,
R and S phrases).
For queries please contact the manufacturer or your supplier.
