Plasti-HDPEeld Borated Polyethylene Sheet. With 5% boron by weight and our trademark purple lor, Plasti-HDPEeld 5% Borated Polyethylene is manufactured to meet all applicable applications for industrial use, medical applications (with regards to cancer treatment) and is effective HDPEelding for support in all areas of security such as seaports, airports, border protection and other applications requiring attenuation of thermal neutrons.Plasti-HDPEeld is certified by prime vendors of the U.S.