These tests apply to slab, bonded, and molded flexible cellular products known as urethane foams. Urethane foams may be generally defined as expanded cellular product produced by the interaction of active hydrogen compounds, water, and isocyanates. Testing includes; Density Test, Indentation Force Deflection Test, Specified Deflection, or Specified Force, Compression Force Deflection Test, Constant Deflection Compression Set Test, Tensile Test, Tear Resistance Test, Air Flow Test, Resilience (ball rebound) Test, Static Force Loss Test at Constant Deflection, Dynamic Fatigue Test by the Roller Shear at Constant Force, or Constant Force Pounding, Dynamic Fatigue for Carpet Cushion, Steam Autoclave Aging, Dry Heat Aging, Wet Heat Aging.