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Flexible Polyurethane Foam Slide Presentation
 

 

Slide 14 of 31

Surface Firmness

Measured at 25% IFD IFD, or Indentation Force Deflection, is a measurement of foam surface firmness. It is the force, measured in the pounds of pressure, required to compress a foam sample 25% of its height using a 50 square inch indentor plate. On a four inch thick sample, the reading would be taken at a 1" compression.

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