The German supplier Deffner & Johann sells a very thin Mylar, called Hostaphan. The thickness is 15 µm (= 0,0006 inches), but it is only 148 cm wide. I don’t know about their international shipping policy. https://www.deffner-johann.de/hostaphanfolie-rnt-15-21-g-m-nicht-silikonisiert.html
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