Cellular foam products have been traditionally checked for load deflection by determining the load required to effect a 25% deflection. In seating, on the other hand, the interest is in determining how thick the padding is under the average passenger load (a measurement of padding left for "ride" and seated height), a second measurement to give an indication of initial softness, and a final figure to indicate resiliency. To most easily fulfill these requirements, load deflection on flexible urethane foams for automotive seating is determined here by measuring the thickness of the pad under fixed loads of 1 lb, 25 lb, and 50 lb on a 50 in2 circular indentor foot.
SAE J815-1998 history
2012SAE J815-2012 Load Deflection Testing of Urethane Foams for Automotive Seating
2007SAE J815-2007 Load Deflection Testing of Urethane Foams for Automotive Seating
2002SAE J815-2002 Load Deflection Testing of Urethane Foams for Automotive Seating
2001SAE J815-2001 Load Deflection Testing of Urethane Foams for Automotive Seating
1998SAE J815-1998 Load Deflection Testing of Urethane Foams for Automotive Seating
1994SAE J815-1994 LOAD DEFLECTION TESTING OF URETHANE FOAMS FOR AUTOMOTIVE SEATING
1962SAE J815-1962 Load Deflection Testing of Urethane Foams for Automotive Seating