This document specifies a test procedure for assessing the scratch resistance of organic paint coatings, in particular paint coatings used in the automotive industry (i.e. for assessing their car- wash resistance). Machine-based washing is simulated in the laboratory environment using a rotating brush and synthetic dirt. The test conditions have been designed to be as close as possible to the real conditions in a car-wash. If the test parameters are suitably chosen, the method can also be used for testing protective plastics films and plastics components.rd edition 2020-05 Paints and varnishes — Determination of the scratch resistance of a coating system using a laboratory-scale car-wash Peintures et vernis — Détermination de la résistance à la rayure d'un système de peinture sur un poste de lavage automobile de laboratoire Reference number ISO 20566:2020(E) ？ ISO 2020 ISO 20566:2020(E) COPYRIGHT PROTECTED DOCUMENT ？ ISO 標準截圖