ISO 2439 Indentation Hardness of Flexible Cellular Plastic Foam

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ISO 2439 Indentation Hardness of Flexible Cellular Plastic Foam

Indentation hardness of flexible cellular materials is a measure of their load-bearing properties. ISO 2439 specifies four methods (A to D) for the determination of indentation hardness and one method (E) for determination of compressive deflection coefficient and hysteresis loss rate of flexible cellular materials. These five methods are applicable only to latex foam, urethane foam and PVC foam of the open-cell type. The methods specified can be used for testing finished articles and for the characterization of bulk material.

Method A determines the 40 %/30 s indentation hardness index, which gives a single indentation measurement;

Method B determines the 25 %-40 %-65 %/30 s indentation hardness characteristics, which provides information about the shape of the hardness indentation curve;

Method C determines the 40 % indentation hardness check, which is for quality control testing;

Method D determines the 25 %/20 s low indentation hardness index, which is an inspection test;

Method E determines the compressive deflection coefficient and hysteresis loss rate, which gives additional information about the load-bearing properties of materials.

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