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<p>[QUOTE=&quot;clayirving, post: 966572, member: 18867&quot;]Mylar D is no longer made. The &quot;Mylar D or equivalent&quot; sleeves from Denly&#039;s are made from Melinex 516 film which also meets the Library of Congress Specification Number 500-500-5/31/95 for use in archival storage. </p><p><br /></p><p>Tom Denly indicates:</p><p><br /></p><p>&nbsp; &quot;<i>Mylar D is a Brand name owned by Dupont plastics.&nbsp; It is truly a true&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </i></p><p><i>&nbsp;&nbsp; polyester with an alignment of the molecules in long straight runs.&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </i></p><p><i>&nbsp;&nbsp; The true reason Mylar D is so good is that it is made to an American&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; </i></p><p><i>&nbsp;&nbsp; Society of Testing Materials standard of purity that is extremely&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </i></p><p><i>&nbsp;&nbsp; tight.&nbsp; Many plastics are mixed with other materials which will lower&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </i></p><p><i>&nbsp;&nbsp; its melting point to a point that it can be heat sealed, these</i></p><p><i>&nbsp;&nbsp; additions are in some cases sulfuric acid, hydrochloric acid, many oils,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </i></p><p><i>&nbsp;&nbsp; and occasionally esters.&nbsp; If not mixed perfectly these additives can&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </i></p><p><i>&nbsp;&nbsp; leach out of the polyester into the paper money.</i></p><p><i><br /></i></p><p><i>&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; You will find that our holders are made to the Standards of Mylar</i> <i></i></p><p><i>&nbsp;&nbsp; D for purity and therefore can not be heat sealed but are welded to</i></p><p><i>&nbsp;&nbsp; form a perfect seal.&nbsp; Our holders are manufactured by computer driven</i></p><p><i>&nbsp;&nbsp; machines such that each holder is exactly like the next.</i></p><p><i><br /></i></p><p><i>&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; When I first got into the holder business Dupont made Mylar</i> <i></i></p><p><i>&nbsp;&nbsp; D, ICI Corp made Melinex 121, and Three M made a third brand of</i></p><p><i>&nbsp;&nbsp; polyester each to the same A. S. T. M standard.&nbsp; Three M stopped making</i></p><p><i>&nbsp;&nbsp; the material as there was too much competition for the limited need for&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </i></p><p><i>&nbsp;&nbsp; the material, Then Dupont bought ICI Corp and realized that why compete&nbsp; &nbsp; &nbsp; </i></p><p><i>&nbsp;&nbsp; and ICI could make it all which it does now.&nbsp; So truly it is a Melinex&nbsp; &nbsp; &nbsp;&nbsp; </i></p><p><i>&nbsp;&nbsp; 121 make to Dupont Standards and Dupont ownership.</i>&quot;</p><p><br /></p><p>Melinex 121 is now Melinex 516.[/QUOTE]</p><p><br /></p>

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