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Dynamic Flex Fatigue Test for Slab Polyurethane Foam
This SAE Recommended Practice describes a laboratory test procedure for evaluating the loss of thickness and the amount of structural breakdown of slab polyurethane foam seating materials.
A test specimen is measured for thickness under a specified load and subsequently subjected simultaneously to compressive and shear deformation in a controlled atmosphere.
This is accomplished by subjecting the foam to a rolling shearing action under a constant load for a specified number of cycles.
Specimen thickness under a constant load is obtained after a 1hr recovery period following dynamic fatigue to determine loss in foam thickness.
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