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Specifies equipment and procedures for determining the shear behaviour. It is applicable to thermal insulating products. The test will however be called shear in this text by convention. The application of a force tangentially to the major surface of the test specimen is considered to represent more closely the stressess imposed upon thermal insulation products in many building applications, particularly walls, than other methods of measuring shear performance e.g. bending tests. Test carried out using the single test specimen method have produced results for shear strength, which indicate the result to be dependent upon test specimen thickness, with more scattered results at greater thicknesses. Tests using the double test specimen method have also shown test specimen thickness to influence results for shear strength.