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This European Standard specifies index test methods for determining the compressive behaviour of geotextiles and geotextile-related products. The test specimens can be subjected either to normal compressive loading or to a combination of normal compressive loading and shear loading. Products which are sensitive to shear failure, i.e. which have a columnar or cuspated structure, should be tested with both normal and shear loads applied (see clause 6), all other products can be tested with a normal load only (see clause 5). The tests are carried out with the specimen dry or immersed in water.