![]() This is seriously implying that poly bags are not to be used for anything other than REALLY transitory storage. I would definitely put my “For Sale” comics into poly-bags, but only for a short term, say a couple of months. They will simply afford a lot less protection against the elements. Poly-bags will not actually destroy your comics. Gerber has to say about storing comics on their web-site (keeping in mind that they are, after all, in the business of selling mylar bags): For regular comics, I’d recommend polyethylene. So, what do you need to use? If you have a very valuable comic (worth $30 – $50 or more), I’d suggest using Mylar. ![]() Due to its rigidity, polypropylene sleeves are more prone to tearing, especially at the seams. Polypropylene is a thermoplastic resin that is a polymer of propylene and is more rigid than polyethylene. Polypropylene: Propylene (CH3CH:CH2) is a sub-stratum of ethylene. Polyethylene is more flexible than polypropylene. The lower static charge produced by polyethylene as opposed to the higher charge emitted by polypropylene means that polyethylene will attract much less dirt, dust and other foreign, organic elements. The translucent nature of polyethylene prohibits a greater amount of light penetration than the transparent polypropylene. ![]() Polyethylene: A polymerized ethylene resin that is inert, translucent and creates a lower static charge than polypropylene. Resistance to moisture, insect attack, fungus, mold, mildew, acid, oils, grease, and solvents is excellent. Resistance to diffusion of gases like oxygen, carbon dioxide, sulfur dioxide, etc. Mylar: A biaxially extruded polyester film that is simultaneously stretched in two directions to give it maximum strength. The 3 most common materials for bags are mylar, polyethylene, and polypropylene, let’s get technical for a moment: That said, mylar is more expensive and is not absolutely necessary for what I’d consider “run of the mill” comics. The Library of Congress uses it, and they know a thing or two about preserving paper products. There is not doubt that mylar is the best material for archival storage of paper collectibles. What are the right bags and boards to buy? What about boxes? You’ve heard about Mylar, do you really need to use it to keep your comics collection from disintegrating before your eyes? Let’s look at these topics in way more detail than non-collectors would ever care about… Some collectors have a lot of angst about storing their comics.
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