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Specifies three methods for determining the indentation hardness of flexible cellular materials. The indentation hardness of flexible cellular materials is a measure of their load-bearing properties. The methods specified can be used for testing finished articles and for the characterization of bulk material. At present the methods are applicable only to latex, urethane foam and PVC foam of the open cell type. The results obtained by these methods relate only to the test conditions specified and cannot, in general, be used directly for design purposes.