1 in x 48 in x 24 in Mineral Wool/Foil Backing 8#, Dark Brown, Roxul, Mfr#: 40260

High Temperature Insulation, Density 8 lb/cu ft, Facing Material FSK Facing, Flexibility Not Applicable, Foam Cell Type Open, Form Board, Insulation Color Brown, Insulation Material Mineral Wool, Maximum Operating Temperature 1,200 Degrees F, Minimum Operating Temperature 0 Degrees F, Overall Length 4 ft, Width 24 in, R Value 4, Thickness 1 in, Standards ASTM C612 Type 1VB, C665, C795 Stainless Steel, Chemically Inert, E136, E84