ISO 13428:2005描述了一种用于确定暴露于半球形物体的冲击载荷的硬质表面上的土工合成材料的保护效率的指数试验。 指数测试测量位于土工合成材料和刚性支撑之间的薄铅板的厚度变化

ISO 13428:2005 describes an index test for the determination of the protection efficiency of a geosynthetic on a hard surface, exposed to the impact load of a hemispherical object. The index test measures the change in thickness of a thin lead plate lying between the geosynthetic and a rigid support.