EVS-EN ISO 3386-1:2000

This part of ISO 3386 specifies a method  for the determination of the  compression stress/strain  characteristic of low-density flexible cellular materials up to 250 kg/m? lt also indicates a method for the calculation of the compression stress value of such materials.The compression stress/strain characteristic is a measure of the load-bearing properties of the material, though not necessarily of its capacity to sustain a long-term load.The compression stress/strain characteristic differs from the indentation hardness characteristics (as determined in accord-ante with ISO 24391, which are known  to  be influenced by the thickness and the tensile properties of the flexible cellular material under test, by the shape of the compression plate and by the shape and size of the test piece. ISO  3386/2 specifies a method for high-density materials and differs from part 1 in the following ways: - it is mainly concerned with materials of density above 250 kglm3; - compression stress values have been deleted; - it doe  not permit the use of a cylindrical test piece.