PET and Mylar are not only Archival Quality and safer than any PVC product, they are also extremely strong when used in films. Uncoated PET cannot be heat sealed - it has to be welded using an RF sealer. If you can heat seal it, it is not pure PET. One quick way to determine if you are using a true PET coin flip is to try to seal it with a conventional heat sealer. True museum quality PET, as defined by the Library of Congress requirements, must be 100% biaxially oriented, clear, colorless PET, free of surface coatings, UV inhibitors and all other additives. Worse yet, that coating - the part touching the coin - may contain PVC. PETG, for example, often contains a coating, additives or UV inhibitors. As a member of the polyester family, PET is basically the generic version of Dupont brand Mylar.ĭifferent types of PET are currently on the market for coin flips, and they are not all created equal. The most common non-PVC archival material used today in called Polyethelyene Teraphalate, or PET. If you really want archival, however, you must abandon PVC all together. Just remember, when it comes to vinyl flips, the harder and more rigid the flip, the safer it is as a storage solution for your coins. This is why some manufacturers will refer to unplasticized flips as “Safe for long term storage”, or even "Archival". As a result, unplasticized flips not only offer more rigidity, but are considered safer for coin storage than soft vinyl. An unplasticized flip is merely a PVC flip without the plasticizer that makes them soft and flexable. There is a widely held misconception about this, so let's repeat: there is no such thing as a PVC free unplasticized flip. Make no mistake, Unplasticized, uPVC or UN flips are still PVC flips. There are two basic types of PVC flips on the market today: Soft flips and Unplasticized (the hard or rigid coin flips). However, PVC is considered a poor choice by curators and museums looking for long term storage. Polyvinyl chloride (PVC), most often referred to as vinyl, is the most common material used in coin flips. Polypropylene based materials are also available, though seldom used in flips due to their lack of rigidity. Most coin flips currently on the market are made from one of two materials: polyvinyl chloride (PVC) or polyester.
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