Shurtape DC 181 UL 181B-FX Listed Film Tape For Flex Ducts DC181 Film Tape 2.83in X 120yd 3.0 MIL Tested in accordance with UL 723 3 mil printed OPP (Polypropylene) Acrylic adhesive UL181B-FX Listed; Tested in accordance with UL 723; FSI 25; SDI 50 Green Point Contributor Product