GeoTrac builds NCTL equipment

To meet the demand of geomembrane stress cracking testing in the UK, Geotrac Rapide is building a 42 station Notched Constant Tensile Load testing machine to perform tests according to the ASTM D5397 standard. A unique feature of this equipment will be web cams used to monitor the strain response of specimens and to record break times. It is understood that there have been a number of failures in the UK of European manufactured HDPE geomembranes to meet the 200 hr and 400 hr break times in project specifications. It may be interesting to evaluate the different methods of determining stress cracking resistance