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<br />Destructive test samples shall be packaged and shipped via express mail to the <br />laboratory. <br />The laboratory shall provide verbal test results no more than 24 hours afrer they <br />receive the samples. Written results will follow within one week. (See Figure 8, <br />example of destructive seam test report form.) <br />Destructive Testin; of Seams <br />Destructive testing of seams is very important because it provides the only direct <br />evaluation of seam strength and bonding efficiency which indicates seam <br />durabilirv. <br />Destructive testing involves two techniques: 1) shear testing, and Z) peel testing. <br />Shear testing applies a tensile stress from the top sheet through the weld and into <br />the bottom sheet. Peel testing, on the other hand, peels the top sheet back against <br />the overlapping edge of the bottom sheet in order to obsen'e how separation <br />occurs. The peel test indicates whether or not the sheets are continuously and <br />homogeneously connected through the seam. <br />~Specitication for Seam StrengSh <br />(based on NSF sa Standards) <br />Material TvoeTvoe No. Of Coupons Minimum Values Required <br /> (Pounds per Inch of Width) <br /> ~ ~e~ Shear Shear <br /> p'°~ <br />i `ci 23 .'C 1 Fusion Extrusion Fuston <br />30 Mil HDPE 2 l 35 49 63 63 <br />40 Mil HDPE 2 1 48 67 86 86 <br />60 Mil HDPE 2 1 70 98 l26 1Z6 <br />80 Mil HDPE 2 1 9~ l33 171 171 <br />100 Mil HDPE 2 l 11~ 168 2l6 2l6 <br />40 Mil Txtrd HDPE 2 l 42 60 76 76 <br />60 Mil Txtrd HDPE 2 l 63 88 113 1 l3 <br />80Mi1TxtrdHDPE 2 1 84 118 l~l 1~1 <br />ILPI standazd testing procedure is as follows: <br />If there is a failure in either peel or shear then five total coupons aze tested. If more than <br />one coupon fails, then the sample fails. This is a modified ASTM method. The ASTIvI <br />methods that aze used aze D4437, D413 and D638 which all can apply. <br />Reasons for Pass/Fail Criteria <br />2a <br />