Peel strength quantifies how well an adhesive resists being pulled back on itself. It is measured in force per unit width, typically pounds per inch (pli) or Newtons per millimeter (N/mm). The test involves pulling a flexible material, like a tape or thin metal sheet, away from a rigid surface at a specific angle (usually 90 or 180 degrees) and a constant speed.
Heard on the job
The new acrylic formulation gave us a peel strength of 15 pounds per inch on bare aluminum.
Insider tip
Peel strength is highly dependent on the angle of the pull and the speed of the test machine.