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Part 2: XR-5° Comparative Chemical Resistance <br /> Chemical Resistance Chart <br /> Comparative Chemical Resistance <br /> XR-5 HDPE PVC Hypalon Polypropylene <br /> Kerosene A B C C C <br /> Diesel Fuel A A C C C <br /> Acids (General) A A A B A <br /> Naphtha A A C B C <br /> Jet Fuels A A C B C <br /> Saltwater, 160° F A A C B A <br /> Crude Oil A B C B C <br /> Gasoline B B C C C <br /> A= Excellent B= Moderate C= Poor <br /> Source:Manufacturer's Literature <br /> XR-5 data based on conditions detailed in Section 3, Part 1. <br /> Part 3: Weathering Resistance <br /> Accelerated Weathering Test <br /> XR-5 has been tested in the carbon arc weatherometer for over 10,000 hours of exposure and in the Xenon <br /> weatherometer for over 12,000 hours of exposure.The sample showed no loss in flexibility and no significant <br /> color change. Based on field experience of Seaman Corporation products and similar weatherometer exposure <br /> tests, XR-5 should have an outdoor weathering life significantly longer than competitive geomembranes, <br /> particularly in tropical or subtropical applications. <br /> EMMAQUA Testing: ASTM E-838-81 was performed on a modified form of XR-5, FiberTite, used in the single-ply <br /> roofing industry. After 3 million Langleys in Arizona, no signs of degradation were noted with no evidence of <br /> cracking, blistering, swelling or adhesion delamination failure of the coating. <br /> Natural Exposure <br /> After over 17 years as a holding basin at a large oil company in the Texas desert, XR-5 showed no signs of <br /> environmental stress cracking,thermal expansion/contraction, or low yield strength problems. Temperature <br /> ranges from near zero to over 100° F. <br /> In service approximately 17 years in a solar pond application at a research facility in Ohio, UV exposed samples, <br /> as well as immersed samples, retained over 90% of the tensile strength. Examination of the material determined <br /> there was little effect on the coating compound.The solar pond was exposed to temperatures from below zero <br /> to over 100° F. <br /> XR5 was exposed for 121/2 years in Sarasota, Florida, on a weathering rack, facing the southern direction at 45°. <br /> No significant color loss, cracking, crazing, blistering, or adhesion delamination failure of the coating was noted. <br /> 13 <br />