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What coating did Quad use on the original Quad ESL diaphragm?

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What coating did Quad use on the original Quad ESL diaphragm?

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A substance called CALATON. CALATON was a form of Nylon, which had its surface modified such that it would go into alcohol/water solution at the reflux temperature of Methyl Alcohol. CALATON was made by I.C.I.

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