Full definition
Force per unit width required to separate a flexible adhesive bond by peeling from one end at 90° or 180°. Measured in N/cm or N/25mm per ASTM D903 or D1876 (T-peel). Rigid adhesives (cured epoxy) have low peel strength (< 5 N/25mm); flexible adhesives (rubber, polyurethane, silicone) achieve 50–200 N/25mm. Critical parameter for labels, packaging seals and flexible gaskets.