Duct tape (commercial grade) is a vinyl based tape with a normal adhesive.
11 mil (0.28mm) 36 mesh.  High quality Polyethylene-coated cloth with a natural rubber resin adhesive.  Tape will conform well to irregular surfaces, and will not twist or curl during application.  Excellent water and abrasion resistance.  Tape is hand-tearable (tears evenly across web.)  Used as a quality waterproof packaging tape for export shipments; for splicing, vinyl repair, protecting, and bundling; for ductwork sealing and seaming; and for color coding.  Adhesion to steel: 59 oz/in width.  Tensile strength: 20 lbs/in.  Elongation at break: 15%.  Temperature range: 32F to 150F. 
■ Size: 2"x60y ■ Color: Brown
Old Part No: TAPE-DUCT2BR
Country Of Origin: United States
Length: 180 Feet
UNSPSC: 31201501
U.S.Tariff#: 3919.10.2055
Warranty: 180 Days Limited
Color: Brown
Width: 2 Inch