We build sound proof enclosures for power generation. Our insulation includes a vapour barrier. Our present choice carries a good fire rating, but still preformed badly in an actual fire. Since this additional precaution seems to have bought us little, we are considering substituting 6 mil poly sheet (or some equivalent in price and service) if one exists with ASTM E-84, Fire Spread Index <25 and Smoke Development Index <450. Does anyone know if such exists? Thanks.
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does any poly sheeting have a fire rating
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