Indentation Force Deflection (IFD)

A measure of the load bearing capacity of flexible polyurethane foam. IFD is generally measured as the force (in pounds) required to compress a 50 square inch circular indentor foot into a four inch thick sample no smaller than 24 inches square, to a stated percentage of the sample's initial height. Common IFD values are generated at 25 and 65 perc...
Found on http://www.pfa.org/jifsg/jifsgs15.html
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