By now, virtually everybody guarantees reliable pre-treatment processes. But to be on the safe side, use test pens to check your production output as specified by DIN ISO 8296:2008 prior to further processing of the materials.
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Safety First Plasmawerk Corona Test Pens 38 dyne ensure reliable test results with regard to the surface tension of pre-treated materials. In combination, test inks and test markers can be used for quality assurance during production, underscoring product conformity as specified in the DIN EN ISO 9001:2008 in the process!