BoPET (biaxially-oriented polyethylene terephthalate) is a polyester film made from stretched polyethylene terephthalate (PET) and is used for its high tensile strength, chemical and dimensional stability, transparency, reflectivity, gas and aroma barrier properties, and electrical insulation.
A variety of companies manufacture boPET and other polyester films under different brand names. In the UK and US, the best-known trade names are Mylar, Melinex, and Hostaphan.

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  1. B

    Lube metals in mylar bags for long term storage?

    Thinking PVC, 7.5 mil mylar bag (possibly double bag it) and 2 packs of oxygen absorbers. I've heard dessicant counteracts what oxygen absorbers need to work properly, so considering just sticking to oxygen absorbers. That begs the question: to lube the metal items or not? I've heard it breaks...
  2. J

    Airtight lids not airtight

    I've tested the "airtight" gamma lids for 5-gallon buckets. Though friends have used for years with no mold, etc., they have a relatively dry basement, so no big challenge. I put a hydrometer into a bucket, sealed it with a gamma lid (with collar in place and gasket checked), and took it outside...
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