Video: Question Of The Month: Is The Product Also Stable?
This frequently asked question can only be answered with a counter question: "Against what?" I would be happy to explain why.
When describing a product, statements are often made about properties and resistance. The focus is not on advertising, here the manufacturers have to observe standards. These standards define criteria and, if necessary, contain test methods by which the suitability of a coating material / system for a specific application can be assessed. They serve as the basis for communication between the manufacturer and the user. No statement can therefore be made without an examination.
The weather resistance of facade paints e.g. B. according to the standard is a pure obligation. Information on weather, light or aging resistance is made on the basis of results from test series in which these properties were tested - be it by long-term weathering on the weather level or by short-term weathering in the weatherometer. Fire behavior such as "A1 - non-flammable" is also a form of resistance, namely against the effects of fire. We find statements on mechanical effects and their consequences on a coating material in the results, among other things, in cross-cut testing, Tabertest, determination of the Buchholz hardness, mandrel bending test, chip test according to Peters, etc. among other things, the wet abrasion resistance tested. The specification of the class can then be found on the product labels. Tests for resistance to shock loads or wind suction are known from the ETICS area. Resistance to chemicals is often emphasized as a special property of a coating. There are only test specifications for furniture paints and oil pan coating, where substances to be tested are specified. In the case of floor coatings, paints, wall paints, etc., the manufacturer specifies the substances to be tested with the test institute. Testing is carried out in accordance with DIN EN 12720 "Assessment of the resistance of surfaces to cold liquids", in addition in accordance with DIN EN ISO 4628 "Assessment of coating damage". The material or surface is loaded with the specified chemicals and / or concentrations for a defined period of time and then assessed. Changes can be discoloration, changes in the degree of gloss, softening, swelling, peeling of the coating or blistering. Coatings that pass these tests and show no changes are suitable for use in these areas.