3M™ VHB™ Tape 4991, conformable foam, multi-purpose acrylic adhesive, gray, thickness 0.090 in. (2.3 mm), red PE film liner. UL 746C - File MH17478. 3M™ VHB™ Tape 4991, bonds to wide variety of high and medium surface energy substrates, plasticizer resistant. UL 746C - File MH17478.