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Chemical processes and technology
47
Soiling
Problem
Solution
The following substances may cause corro-
sion to stainless steel in the wash cabinet
and on accessories:
- hydrochloric acid
- other substances containing chlorides,
such as sodium chloride
- concentrated sulphuric acid
- chromic acid
- particles of iron and shavings
- Thoroughly rinse wash items in water be-
forehand.
- Put the drip-dry items to be washed into
the mobile units, baskets, modules, and
inserts and start a reprocessing program
as soon as possible after placing in the
wash cabinet.
Reaction between process chemicals and soiling
Problem
Solution
Natural oils and fats can be emulsified with
alkaline process chemicals. This can lead to
a heavy build-up of foam.
- Use the
Oil program
.
- This special program dispenses emulsi-
fiers (pH neutral) in the pre-wash.
- Depending on the application, use de-
foaming agents that do not contain sili-
cone oils.
Soiling containing high protein levels, such
as blood, can cause a heavy build-up of
foam when processed with alkaline process
chemicals.
- Select a cleaning program with at least
one short pre-wash in cold water.
Non-precious metals such as aluminum,
magnesium, and zinc can release hydrogen
when processed with very acidic or alkaline
process chemicals (oxyhydrogen reaction).
- Please observe the process chemical
manufacturer’s instructions.