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Standards Development
This document gives an overview on the weathering and radiation testing of coatings on plastics, plastics composites and similar substrates, hereinafter shortly referred to as plastics. Characteristics and differences to metallic substrates of plastics are explained, as well as their effect on the behaviour of the coating during the weathering test.
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 weathering 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.
The methods listed refer to simple, flat test specimens for material ageing. For three-dimensional
samples, deviations in the homogeneity of irradiance and surface temperature can occur during
artificial weathering. This is taken into account during the testing of three-dimensional samples.
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