Jerry,
Hardware stores used to stock it in small envelopes, cuts easily with a sizzors. You can also get it from Lehman Hardware, Kidron ohio. They are on the net. They should have them for the windows in Perfection oil stove chimneys. I would also think googleing mica replacement stove part, might bring it up. If you don't find it contact me I have othe sources.
Larry
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