Below is a list of Sealing Tape manufacturers from Azusa, California. Sealing tape is a single-sided, pressure-sensitive tape used mostly for closing or sealing slotted containers such as packing cartons and corrugated fiberboard boxes. It is commonly used in warehousing industries for shipping and packaging needs. An adhesive is coated onto the backing material, which is usually made out of polypropylene or polyester film.