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Caliper

The thickness (as of a sheet of paper) measured under specific conditions.

Bursting Strength

The ability of a tape to resist damage when a force is applied evenly and perpendicularly to the surface of a tape.

Blocking

Adhesion between the sheets of the plies of rolls of coated material, usually due to extreme conditions of pressure, temperature, or humidity.

Bleeding

Penetration through the tape of a coloring material (paint, etc.) onto the surface to which the tape is applied.

Backsize

An occlusive coating applied to the non-pressure sensitive side of a porous backing such as paper in order to provide a satisfactory surface that the pressure sensitive adhesive can contact when the tape is wound into a roll.

Backing

A relatively thin flexible material to which the adhesive is applied.   Theoretically any material that is reasonably flat, thin, and flexible can be used as a tape backing.

Anchorage

The specific adhesion of a pressure sensitive adhesive to a face material or an anchor coat.

Adhesive Transfer

The conveyance of adhesive from its normal position on the tape backing to a surface to which the tape was attached, either during unwind or removal.

Adhesive Deposit or Residue

Adhesive that is pulled away from the tape upon removal and remains on the surface to which it has been applied.

Adhesion to Backing

The bond produced to the backing of the same tape or another tape backing.

Accelerated Weathering (aka Weathering)

Exposure in a chamber to ultraviolet light, heat, and water whereby the effect of outdoor exposure on a tape can be approximated.