Definition of Chemical Resistance

Currently, the materials are divided into three classes [243]  

Ratings that used to distinguish 5 or 7 classes, respectively, are no longer in use [243]. 

The categories in use currently describe the behavior of plastics under the influence of a particular medium under certain conditions (temperature, concentration). Simply stated, the concepts mean [243]  

Even such qualitative rating requires the definition of permissible damage and the establishment of evaluation criteria and limit values for their change under media influence. As early as 1940, Buchmann [246] included tensile strength and elonga- 

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