1 1/2 in x 12 in x 12 in Calcium Silicate High Temperature Insulation, Johns Manville, Mfr#: 684703

High Temperature Insulation, Density 40 lb/cu ft, Facing Material Unfaced, Flexibility Not Applicable, Foam Cell Type Closed, Form Board, Insulation Color White, Insulation Material Calcium Silicate, Maximum Operating Temperature 1,700 Degrees F, Minimum Operating Temperature 0 Degrees F, Overall Length 12 in, Width 12 in, R Value 1.54, Thickness 1 1/2 in, Standards ASTM C656, C795, E119, E136, E72, E84, NFPA251, UL 1479, UL 1709, UL 263, Water Vapor Absorption Minimal