Weathering is a general yet complex term that includes many elements, among which are the effects of sunlight, oxygen, ozone, humidity, precipitation, wind and atmospheric impurities. The problems associated with the weathering of polymeric products used in outdoor applications are complicated, due to the fact that different polymeric materials may be combined in one product. Many additives used to enhance polymer processability may also have a negative effect on weathering resistance, either due to their own instability or in some cases a photosensitising effect on the polymer. This Review Report describes the theory of weathering and its effect on polymer properties, methods of stabilisation, and natural and accelerated weathering tests. The problems associated with particular polymers used in outdoor applications are explained.

Further data on specific materials and descriptions of measuring techniques can be obtained from the 461 references and abstracts from the Polymer Library, which complete the report.