传统上，通过确定产生25%挠度所需的荷载，检查泡沫泡沫产品的荷载挠度。另一方面，在汽车座椅中，通过确定恒定力条件下的厚度来检查载荷偏转，以（a）指示座垫的初始柔软度，（b）测量平均乘客载荷下座垫的厚度（“乘坐”和就座高度的剩余衬垫的测量值），以及（c）确定指示弹性的值。在这种方法中，这些测量是通过确定座椅软垫在4。 5 N、110 N和220 N，带有323 cm2圆形压头脚。

Traditionally, cellular foam products have been checked for load deflection by determining the load required to effect a 25% deflection. In automotive seating, on the other hand, the load deflection checked by determining the thickness under constant force conditions to (a) indicate the initial softness of the seat cushion, (b) measure how thick the seat cushion is under average passenger load (a measurement of padding left for "ride" and seated height), and (c) determine a value to indicate resiliency. In this method these measurements are made by determining the thickness of the seat cushiong under fixed loads of 4.5 N, 110 N, and 220 N with a 323 cm\u2 circular indentor foot.