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Appendix B - Chemical resistance
Chemical resistance of ceramic tiles
The ceramic plates used originate from chemical apparatus construction, have been subject
to practical testing for more than 40 years and have proven their durability in laboratories all
over the world. Outstanding properties of the ceramic material used are the excellent
chemical resistance, the hardness and the temperature resistance of up to 800°C.
The technical ceramic is characterised by very good chemical resistance to most laboratory
chemicals, without staining or loss of gloss. The following table gives an overview of the
resistance to aggressive media:
A method that classifies the scratch resistance of different materials very clearly is the Mohs
test. In this scale, the diamond is the hardest material with a Mohs hardness of 10 and
scratches all materials with lower hardness values. Common knife steel, for example, has a
Mohs hardness of 6 and cannot scratch the ceramic plate. The hardness of the plates used
is between 6 and 7.
The hardness and associated scratch resistance of the ceramics used also allows coarser
cleaning processes. The work surface remains unchanged.
Hygienic conditions are ensured by the even, impermeable surface. Bacteria or other
microorganisms do not have the possibility to penetrate or grow. The optimal cleanability
avoids sources of nutrition on the surface.
Acids Lyes Aggressive Solvent
48% hydrochloric acid
Sodium hydroxide
Hydrogen peroxide
Ethanol
70% nitric acid
Methyl ethyl ketone
98% sulphuric acid
Acetone
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