24 in x 48 in Melamine Foam Insulation Sheet, 1 in Thick, 3.85 Approx. R Value, Light Gray Item # 4NNP4 Mfr. Model # 0079-2448SS100-SH-0000-00 PE300 Sheet - HNOKAYgroup.com Home / Products / Semi-finished Engineering Plastic Sheet / UHMWPE Sheets / PE300 Sheet.