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Standards Development
This document gives an overview on chemical tests on the coatings of plastics, plastics composites and similar substrates.
Chemical resistance is normally a surface test, nevertheless the substrate has an influence and is also 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. Chemical resistance is normally a surface test, nevertheless the substrate has an influence and is also considered.
An overview of the common chemical resistance tests 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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