Now even the heaviest packages can withstand rough handling. Our Scotch® Heavy Duty Shipping Packaging Tape holds strong on all box types, including 100% recycled boxes. It’s even guaranteed to stay sealed. The strong, tough, solvent-free hot melt adhesive locks in your heavy duty contents and locks out everything else. Meets US Postal Regulations for standard packages. Tape Type: Packaging; Adhesive Material: Hot Melt; Thickness: 3.1 mil; Size: 1.88″ x 54.6 yds.