Polyken 221 Premium Screen Block Duct Tape is a quality grade, solvent resistant cloth tape, designed for silk screening, packaging and sealing applications. Polyken 221 Duct Tape applications include: screen blocking of frames in the screen print industry; waterproof packaging; can and barrel sealing; sealing white pre-formed duct joints; sealing tape for sidewall building materials; and sealing flex duct connections. It is highly conformable and its aggressive adhesive provides clean removal from frames.