Rothoblaas - Tapes, Sealants and Membranes Page 199
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DURABILITY FIRST AFTER The polymers from which the synthetic membranes are made have been specially engineered to perform their function in the product and have excellent properties. Certain stress causes, such as UV radiation, high temperatures and pollutants, affect these properties. For example: the mechanical properties of a new membrane and a membrane exposed to ultraviolet (UV) radiation for 6 months are different. This is because UV attacks the chemical structure of certain polymers which, if not adequately protected by UV stabilisers, affect the properties of the finished product. temperature UV rays pollutants (surfactants) In order to maintain the properties of the product, it is important to choose it taking into account the conditions it will be exposed to throughout its life, from construction to operation, and to protect it as much as possible (the construction phase is a source of stress and accelerated ageing). Durability is affected by the sum of these sources of stress: temperature, UV and pollutants. CORRELATION BETWEEN EXPERIMENTAL AND ACTUAL RESULTS The data obtained from the ageing tests are comparative and not absolute data. The relationship between test exposure and outdoor exposure depends on a number of variables, and no matter how sophisticated the accelerated ageing test may be, it is not possible to find a conversion factor: in accelerated ageing tests the test conditions are constant, whereas during real outdoor exposure they are variable. The most that can be expected from accelerated laboratory ageing data is a reliable indication of the relative strength ranking of a material compared to other materials. In the reality of a construction site, a product tends to be subject to more than one cause of stress and the conditions are unpredictable. Each application context has specific conditions, with effects that are difficult to measure with a standard test. Therefore, it is important to maintain large safety margins, for example by choosing products with better properties even where not specifically required. Given highly variable weather and radiation conditions, the value may change based on the country and weather conditions at the time of application. SEASONAL VARIATIONS PRODUCT ORIENTATION LATITUDE ALTITUDE YEARLY RANDOM VARIATIONS IN TIME MEMBRANES | BREATHABLE AND VAPOUR CONTROL SCREENS | 199
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