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6. Environmental ageing of insulating materials
The problem of assessing the ageing of solid insulating materials under the effect of environmental stresses, usually encountered in outdoor use, is addressed in French standard NF C 20-540. This standard, which can also be applied to smaller materials, involves the effect of solar radiation and weathering (humidity, rain, heat, cold). The test involves subjecting material specimens to a combined cycle of climatic stresses. Light radiation is produced by a xenon arc lamp combined with quartz and borosilicate glass filters to eliminate wavelengths below 290 nm. The test chamber is shown in figure 35 . The test is carried out on a weekly cycle, the diagram of which is shown in figure 36 .
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Environmental ageing of insulating materials
Resistance of insulating materials to mechanical stress
Bibliography
In Engineering Techniques
Theses
- - http://www.sudoc.abes.fr
- BRAGA (D.) - Etude des phénomènes de charge des matériaux isolants sous faisceau d'électrons de basse énergie (200 eV-30 keV). - Université de Paris-Sud (2003).
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Standardization
French Standards Association
- Essais d'environnement. Méthodes d'essai. Essai de vieillissement climatique des matériels et des matériaux synthétiques à usage extérieur - XP C 20-540 - 6-02
- Isolants solides - Produits à base de mica, en rouleaux - Spécifications - NF C 26-122 - 5-71
- Isolants solides - Produits à base de mica, souples - Spécifications - NF C 26-125 - 1-72
- Isolants solides. Isolants...
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