Hupfer SPA/EB-1 Manual De Instrucciones página 23

Food serving trolley
Do not bring parts made from stainless steel into contact with concentrated ac-
ids, seasonings, salts etc. for longer than is absolutely necessary. Acid fumes
which form during cleaning of tiles also promote the corrosion of "refined stain-
less steel".
Avoid damaging the surface of the stainless steel, particularly by metals other
than stainless steel. Residues of extraneous metals produce extremely small
amounts of chemical elements which can cause corrosion. In any case, con-
tact with iron and steel should be avoided because that leads to extraneous
rust. If stainless steel comes into contact with iron (steel wool, swarf from
pipes, water containing iron), this can be the trigger for corrosion. Therefore
for mechanical cleaning use exclusively refined steel wool or brushes with nat-
ural, plastics or refined steel bristles. Steel wool or brushes with unalloyed
steel lead to extraneous rust due to abrasion. Fresh rust sites can be eliminat-
ed using gentle abrasives or fine abrasive paper. More severe rust sites can
be washed away with warm 2 – 3 % oxalic acid solution. If these cleaning
agents fail, treatment with 10 % nitric acid is necessary.
Caution! This should only be carried out by technically trained staff observing
the existing regulations!
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