Hi Lemontree,
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is these vinyl sheets the same, that are used as an example, in kitchens doors, or in refrigerator rooms doors, when such a doors lets easily pass through people with stuff, but stops circulating air between two rooms? it seems not easy way to find them in Latvia. but will see....
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Yes. Looks like you are going to have problem like me. Definetely there will be a supplier for Vinyl in your country. The question is where? Here in Malaysia, shop owners don't trust internet marketing but trust YellowPages more to advertise thier business. Most of shop owners do not know scientific name for the materials we asked for. Worst will be like they ask us to bring sample so that they could search for it.
I think in Europe, you can always buy materials from internet. Just search for vinyl sheet from your favourite online shopping site and you can find some.
Some seal material will not show incompatibility on chemical immediately. When the electrolyte gets warm or hot then leakage starts to happen. Plexiglas (acrylic) compatible with KOH. Polycarbonate compatible with NaOH. Not the other way round. Lucky members from oupower.com did extensive test on some materials and list down chemical compatibility. This makes my job easier.