Well as you can see by the title, It seems that Mylar-D Currency holders have been discontinued:crying: And no longer Are a product of the Dupont corporation, I have heard this From 3 sources!! That sell Currency holders on E-bay! If anybody has heard the same please reply, Need info on This! I will follow up with this thread, ASAP
Mylar-D holders are still being made - BUT only for as long as existing material is available. Dupont made the decision a couple years ago to discontinue making Mylar-D (not really sure why!). Prolar is the equivalent substitute. For the most part - the brand name of the chemical is unimportant really - just keep in mind which materials are safe, and buy the appropriate products - and i doubt you will ever be disapointed
If you really want Mylar-D, check Denly's of Boston: http://www.denlys.com/inventory/holders2.asp?category=Bank Note and Check Holders
Yes, but they have an 'out' from their website- you have got to be careful with statements like that! You have no idea what they are terming as 'equivalent'! If they dont say exactly what the sleeves are made from - i would find a different seller!
That's is true -- You have to be careful with statements like that, but do you doubt Dealy's of Boston would sell an inferior sleeve? Nonetheless, I sent an inquiry to Dealy's asking them to qualify what "Mylar D or equivalent" means and the material used for the archival currency sleeves they offer.
Great update, Would appreciate you following up with the thread when You get more information!! Thanks
ABSOLUTELY!!!!! i trust no one! heck its my collection i am trying to protect not theirs right?! If with your inquiry, they tell you the exact material the notes are made from - or they tell you its either A or B, and both A and B are known safe materials, then i would buy from them, yes. But left with the blanket statement on their website, no, i would not buy from them.
Denly,s of Boston, Has a good rep, Have bought many items from Them and would consider them a reliable source, But the blanket Statement "Mylar-D or equivalent" Kind of bothers me, For my money I think i need to know what that equivalent is!
I received a reply from Tom Denly: Mylar D is a Brand name owned by Dupont plastics. It is truly a true polyester with an alignment of the molocules in long straight runs. The true reason Mylar D is so good is that it is made to an American Society of Testing Materials standard of purity that is extremely tight. Many plastics are mixed with other materials which will lower its melting point to a point that it can be heat sealed, these additions are in some cases sulfuric acid, hydrocloric acid, many oils, and occasionally esters. If not mixed perfectly these additives can leach out of the polyester into the paper money. You will find that our holders are made to the Standards of Mylar D for purity and therefore can not be heat sealed but are welded to form a perfect seal. Our holders are manufactured by computer driven machines such that each holder is exactly like the next. When I first got into the holder business Dupont made Mylar D, ICI Corp made Melinex 121, and Three M made a third brand of polyester each to the same A. S. T. M standard. Three M stopped making the material as there was too much competition for the limited need for the material, Then Dupont bought ICI Corp and realized that why compete and ICI could make it all which it does now. So truly it is a Melinex 121 make to Dupont Standards and Dupont ownership. I do not type real well but I hope I have answered your question. I wrote back to Tom: I have no problem at all understanding your typing. I do have a question about Melinex 121 -- I can't find any information about this particular product, but I did find there are more than 930 basic grade types of Melinex! Most references for archival sleeves indicate Melinex 516 or Melinex 456 are used. The Library of Congress Preservation Web site indicates: ---------------------------------------------------------- Update on Acceptance of Polyester Film Products for Use in Encapsulation of Paper Artifacts (Revised October 22, 2004) Over the past several months, we have tested several biaxially oriented polyethylene terephthalate (PET) polyester films and found them to be satisfactory for use in encapsulation of paper artifacts. The acceptable films are: [*]DuPont Teijin Films Melinex® film types 455, 456, 515, 516, made by DuPont Teijin Films (see http://www.dupontteijinfilms.com/ for international distributors) [*]DuPont Teijin Films Mylar® type LJP181 and KL, made by DuPont Teijin Films (see http://www.dupontteijinfilms.com/ for international distributors) [*]DuPont Hongji Films Type 8511 and Melinex®516, made by DuPont Hongji Films Foshan Co. Ltd., China [*]Hostaphan® 43SM film, made by Mitsubishi Polyester Film, LLC, of Greer, SC 29652. [*]SKC Inc.'s films SH71S®, SKC SH72S® and SKC SH18S®. These films are available from a number of distributors. [*]Tairlin CH28® film, manufactured by Nan Ya Plastics Corporation, Taipei, Taiwan, and available from Granwell Products, Inc., 185 Fairfield Avenue, West Caldwell, NJ 07039. To the best of our knowledge, all of the tested films, with the exception of Melinex type KL and type KM films, are coated for slip on one or both sides for ease of handling. The two uncoated films are available in very small thicknesses, 92 gauge for Melinex® type KL and 48-200 gauge for type KM, which conservators may find limiting for many applications (100 gauge equals approximately 1 mil or one thousandth of an inch). While we would generally prefer uncoated stock to eliminate any chance of an unforeseen interaction with the artifacts being encapsulated, we do realize that most processors find slip coating to be essential for ease of handling. Moreover, most such coatings are highly stable. ------------------------------------------------------------------------------------------------------------- Tom replied: 121 was the old, old, old number and now my distributer says he uses 516. I need to kep up with things
Hi Clay!! I can see you put allot of time into this thread on Mylar-D And its much appreciated!!!, When your storing things that are worth Some dough, You need to have confidence in your holder! Thanks again for your excellent work
Thats excellent! But i dont understand why they wouldnt say as such on their website. Why say 'or equivalent'? With their response, however, i would feel confident shopping with them, if they were cheaper then my source I also feel very confident in 'Tom's' knowledge! His response showed he had a solid understanding of the materials! At least you understand the importance of verifying the material of the products you use. Did you see what some of those additives are?? HOLY COW!!! i certainly wouldnt want those leeching into my notes!!!!
