ISO 1209-1:2007规定了一种评估刚性多孔塑料棒在三点弯曲作用下性能的简单方法。 它可用于确定特定变形的荷载或断裂荷载。 规定的方法版本使用小试样，不会产生纯弯曲。因此，不允许计算弯曲强度或表观弯曲模量（弹性模量）。用户可参考ISO 1209-2确定这些参数。 该方法不适用于观察到明显破碎的泡沫塑料。只有在物理性质和尺寸相似的材料上确定数值时，才应进行比较。 该方法仅限于厚度为20 mm或更大的材料。

ISO 1209-1:2007 specifies a simple method for assessing the behaviour of a bar of rigid cellular plastic under the action of three-point bending. It may be used to determine either the load for a specified deformation or the load at break. The version of the method specified uses small test specimens and does not produce pure bending. Hence it does not permit the calculation of the flexural strength or the apparent flexural modulus (modulus of elasticity). The user is referred to ISO 1209-2 for the determination of these parameters. The method is not applicable to cellular plastics in which significant crushing is observed. Numerical values should be compared only when determined on materials of similar physical properties and dimensions. The method is limited to materials of 20 mm thickness or greater.