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Standards Development
This document gives an overview on the testing of the stone-chip resistance of coatings on plastics, plastics composites and similar substrates. Stone-chip resistance is usually assessed through surface tests, but nonetheless the substrate has an influence and is considered.
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. Impacts due to loose chippings on a road surface or other materials can cause damage to paint finishes. It is possible for single layers or all layers to flake off from the substrate. Stone-chip damage can be replicated with single-impact and/or multi-impact test procedures. ISO 20567 1 and ISO 20567 4 describe multi-impact test procedures, ISO 20567 2 and ISO 20567 3 describe single-impact test procedures. Many of the existing test procedures for coatings have been developed for metallic substrates, and in the past they have often also been applied to plastics substrates. This document explains characteristics of plastics and differences between plastics substrates and metallic substrates, and it shows their potential effect on the behaviour of the coating in different test procedures.
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