4 in x 48 in x 24 in Polyisocyanurate High Temperature Insulation, 2#, Itw, Mfr#: 684709

High Temperature Insulation, Density 2 lb/cu ft, Facing Material ASJ Facing, Flexibility Not Applicable, Foam Cell Type Closed, Form Board, Insulation Color Yellow, Insulation Material PIR Foam, Maximum Operating Temperature 297 Degrees F, Minimum Operating Temperature -297 Degrees F, Overall Length 4 ft, Width 24 in, R Value 21.1, Thickness 4 in, Standards ASTM D1622, C518, D2126 Dimensional Stability, E84 at 1 in, E96, Water Vapor Permeability 0.02 perm