Chemical processes and technology
47
Soiling
Problem
How to resolve it
The following substances can cause
corrosion of the stainless steel in the wash
cabinet and the accessories:
– hydrochloric acid,
– other substances containing chlorides
such as sodium chloride etc.,
– concentrated sulphuric acid,
– chromic acid,
– iron particles and shavings.
– Thoroughly rinse items in water
beforehand.
– Put the drip-dry items to be washed into
the wash carts, baskets, modules and
inserts and start a program as soon as
possible after placing in the machine.
Reaction between process chemicals and soiling
Problem
How to resolve it
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
.
– Use a special program that dispenses
emulsifiers (pH neutral) in the pre-rinse.
– Depending on application use de-foaming
agents that do not contain silicone 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 wash program with one or more
short pre-rinses with 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).
– Observe the instructions of the
manufacturer of the process chemicals.
