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Standards Development
This document gives an overview on the abrasion and scratch tests of coatings on plastics, plastics composites, and similar substrates, hereinafter collectively referred to under the term plastics. Characteristics and differences to metallic substrates of plastics are explained, as well as their effect on the behaviour of the coating during the abrasion and scratch tests is taken into consideration.
Many of the existing test methods for coatings have been developed for metallic substrates and were often applied to plastics substrates in the past. This document explains characteristics and differences of plastics to metallic substrates and shows their possible effect on the behaviour of the coating in various test methods. It can happen that the substrate has an effect on the behaviour of the coating during the test. Therefore, it can be useful to select test conditions which are based, for example, on standards from the plastics sector and not on standards from the coating sector, in order to take into account influencing factors such as the thermal conductivity of the substrate. An overview of the common abrasion test methods is given. Many of the existing test methods have been developed for coatings on metals. In this document it is explained which test methods can lead to a deviating behaviour of the coating on plastics substrates and which measures can be taken, where appropriate. It can happen that the substrate has an effect on the behaviour of the coating during the test. At times it can be useful to select test conditions which are based on standards from the plastics sector and not on standards from the coating sector, in order to take into account the thermal conductivity of a plastics substrate which is normally lower.
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