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To decide whether or not the agreed upon resins and batches were used. For geotechnical applications, it is not only the performance properties, but the long-term behaviour, which is of particular importance. Accordingly, it is common to classify the tests in the following groups: performance tests to check the performance properties, index tests to determine various parameters which characterise the product and may serve to define quality (see Sect. 4) and durability tests to check the long-term properties.

1 Overview Tests on geomembranes serve various objectives. First performance properties must be determined, then whether the quality standards were adhered to while manufacturing the geomembrane from the selected material and installing it on the construction site must be checked. e. to decide whether or not the agreed upon resins and batches were used. For geotechnical applications, it is not only the performance properties, but the long-term behaviour, which is of particular importance. Accordingly, it is common to classify the tests in the following groups: performance tests to check the performance properties, index tests to determine various parameters which characterise the product and may serve to define quality (see Sect.

Oxidation therefore progresses very slowly. Only at high temperatures does radical formation and oxidative reaction mechanisms get considerably accelerated, for example under conditions prevailing during polyethylene processing. To inhibit the oxidation process, certain chemical compounds (antioxidants or stabilisers) are added to the polyethylene, see Sect. 2. The socalled chain-breaking-donors or primary antioxidants, also called inhibitors, react with the chemical radicals. They thus interrupt the reaction chain.

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21-neighbour packing of equal balls in the 4-dimensional Euclidean space by Szabo L.


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