 For example, in Rotational Molding, to identify the environmental stress crack resistance of a sample, the Notched Constant Tensile Load Test (NCTL) is put to use.Owing to these desirable properties, pipes constructed out of HDPE are ideally applicable for potable water, and waste water (storm and sewage).HDPE has a wide variety of applications; for applications that fall within the properties of other polymers, the choice to use HDPE is usually economic