Testing

Chemical resistance

Various resistance tests are used to determine how a material reacts to external influences on an accelerated scale. We carry out tests according to many common standards and OEM regulations.


Media resistance test

A component surface is exposed to various media such as sweat, oil, grease or hand cream during use. Residues of sunscreen in particular are known to leave stains on painted surfaces. But there are other dangers lurking in a vehicle interior, such as spilled drinks (coffee, cola or juice) or food residues (e.g. ketchup) on the component surfaces. Last but not least, the component must withstand various cleaning agents or solvents without any changes. In simplest tests, the test medium is only applied to the surface for a defined time; under more stringent conditions, an increased temperature or simultaneous friction load may be required. A media resistance test allows possible damage (such as paint adhesion problems, gloss and colour effects, strength reduction, etc.) to be detected in advance.


Stress crack resistance

Many plastics can be destroyed by simultaneous exposure to a load (mechanical stress) and a crack-inducing medium. The stress crack resistance of plastics is usually tested using the bending strip method according to DIN EN ISO 22088-3. For this purpose, the test specimen is fixed with a specified radius of curvature and exposed to the test medium (e.g. a solvent). Tougher tests are again carried out under increased temperature. After the appropriate exposure time, possible changes are first assessed visually. In addition, mechanical tests on the treated test specimens could follow.  


Soiling and cleaning behaviour

Soiling and cleaning behaviour is particularly important for textiles (seat covers). A defined standard amount of dirt is applied to the textile and rubbed into the textile. The textile is then cleaned with specified cleaning agents and the deviations from the initial condition are assessed. 


Corrosion test / salt spray test

Corrosion is a widespread problem with metallic materials. It occurs especially in a tropical climate with high humidity and temperature, which is simulated by a condensation water test. In system groups, there can also be interactions between the materials used. For example, the water could dissolve the flame retardant out of a plastic and lead to corrosion on contacts of an electronic system. Increased corrosion occurs when salts are involved. In a salt spray chamber, component stress is simulated near the sea or through contact with road salt. Above all, optical changes to the surface (e.g. of chrome plating) are assessed.

Alexander Grosch
Marketing and project management
Obernburg
+49 6022 81-2674
a.grosch@aso-skz.de
Andreas Hohm
Marketing and project management
Obernburg
+49 6022 81-2671
a.hohm@aso-skz.de

ASO kompakt (example of use)

Lackveränderungen nach Kontakt mit Lösungsmittel im Rahmen der Prüfung bzgl. Chemikalienbeständigkeit
Crockmeter-Test (Scheuertest  für lackierte Oberflächen nach DIN EN ISO 105-X12). Das Gewebe bzw. das Vlies, mit dem auf der Oberfläche gerieben wird, kann vor dem Abriebtest mit verschiedenen Flüssigkeiten getränkt werden.

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