Peel strength refers to an adhesive's ability to withstand forces that attempt to peel it away from a surface. This parameter is of great importance because it affects adhesion to various surfaces.

Peel strength depends on various factors such as the type of materials, surface preparation, temperature and humidity. To measure peel strength, a test specimen is typically used that is applied to a surface with an adhesive or coating. The test specimen is then removed from the surface under controlled conditions and the force required to remove the material is measured.

Examples of different peel strength requirements include duct tape and masking tape. These two adhesive tapes are intended for different locations and at the same time require different peel strengths.

• The armored tape has to withstand different weather influences, environmental conditions and loads.
• The masking tape should not have this. It should prevent paint from flowing under, but should also be easy to remove (peel) from the wall.

Peel strength is the average load value per bonded sample width required to separate the bonded materials at a separation angle of 180 degrees and a separation rate of 152.4 mm/min.