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Blackened Bass 14th December 2019 12:14 AM

Johns Mansville 1200 industrial board
 
Anyone have any experience with this product,
Johns Manville MinWool-1200 Industrial Board 1280 4" (102mm) density 8 pcf (128 kg/m^3). This stuff comes in 48"x60" sheets 4" thick.
I checked https://www.bobgolds.com/AbsorptionCoefficients.htm and the numbers looked similar to O.C. 703
I just wondered if anyone had any thoughts or opinions on this stuff.