![]() ASTM D638-46T tensile test pieces were used to determine the strength of the mixtures, the horizontal UL 94 incipient regime flame test was used to determine flammability, and a simulated weathering test was developed to evaluate weatherability. Carbon black was used to protect against photo-oxidation ammonium chloride was used as a flame retardant, and clay served as a flame retardant while also imparting hardness. The additives: carbon black, clay, and ammonium chloride were compounded with the polyethylene. To function as a roofing material, weatherability (resistance to photo-oxidation), low flammability, and good strength were identified as the key requirements that must be met by the polymer. ![]() This research investigated the enhancement of polyethylene properties through the use of additives to make it suitable as a roofing material.
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