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Chemical processes and technology
Soiling
Problem
The following substances can lead to a
heavy build-up of foam during washing and
rinsing:
– some disinfecting agents and dishwash-
ing detergents,
– active foaming agents such as tensides.
The following substances cause corrosion
to stainless steel in the wash cabinet on ac-
cessories:
– hydrochloric acid,
– other substances containing chlorides
such as sodium chloride etc.,
– concentrated sulphuric acid,
– chromic acid,
– particles of iron and swarf.
Reaction between chemical agents and soiling
Problem
Soiling containing high protein levels such
as blood can cause a heavy build-up of
foam when processed with alkaline chem-
ical agents.
Non-precious metals such as aluminium,
magnesium and zinc can release hydrogen
when processed with very acidic or alkaline
chemical agents (oxyhydrogen reaction).
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How to resolve it
– Thoroughly rinse items in water before-
hand.
– Select a cleaning programme with at least
one short pre-rinse in cold or hot water.
– Thoroughly rinse items in water before-
hand.
– Put the drip-dry items to be washed into
the mobile units, baskets, modules and
inserts and start a programme as soon as
possible after placing in the washer-disin-
fector.
How to resolve it
– Select a cleaning programme with at least
one short pre-rinse in cold water.
– Please observe chemical agent manufac-
turer's instructions.
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