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0 <br />ISCQ MDPEPmrtrctCatalog <br />The first Environmental Stress Crack (ESCR) testingwas conducted on compression <br />mdded tensile bars. As resin manufactudngtechniques havelmprovK samples no <br />longer failed using th@HSCR test methods. ESCR testing uses strong detergents at elevat- <br />ed temperatures to evaluate twits. <br />The PEW test Is agood test of resistance to slowcrackgrowth aux! related Mures <br />Induced by the presence of stressing agents. Since th is test is conducted using NDPR <br />pips, it Is a better test to determine the test resins to use for plpingapplications. <br />Traditional broad molecular aelgltt resins are used to produce most high•densitypdynth- <br />ytenepipe Typlcat PENT Test values for these HDPE pipes are 100 to 600 hours. <br />The Chart betow shows the modutarweight distributIm for Bimodal. Broad and Narrow <br />atdecular weight resits. <br />Wleculnr Might Distribution <br />The dotted Une shows a typical tmiecularweight dhtrbuthon for a narrow molecular <br />weight HDPE resin. The dashes show Just the distribution for a brand mdeculor weloht <br />HDPE. The sand lino shows the distribution of a biamdal IIDPH resin. <br />The properties of the HDPE resin can be changed because of the molecular distribution. <br />Density and melt Index also are important In tailoring the properties of the HDPHreshn <br />Lane Molleettlar Wiglrt Mgh <br />4� CoprRht W04 ISCO indwtrm. LIC. All Milos Rmffod. <br />