Peel strength testing is a method for evaluating the adhesive bond between two materials by measuring the force required to separate them by peeling. It is widely used for pressure-sensitive adhesive tapes, labels, film laminates, and packaging materials.
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What is Peel Strength?
Peel strength is the force per unit width required to separate two bonded materials by peeling one away from the other at a defined angle. It is typically expressed in N/mm or N/25 mm (N per 25 mm width).
Peel Test Methods
90° Peel Test
The flexible substrate is peeled from the rigid substrate at a 90° angle. One of the most common peel test configurations. Standardized in JIS Z 0237 and ASTM D6862.
180° Peel Test
The substrate is bent back and peeled at a 180° angle. Commonly used for pressure-sensitive adhesive tape evaluation. Standardized in JIS Z 0237 and ASTM D903.
T-Peel Test
Both substrates are flexible and are peeled apart in a T-shape. Used for flexible film laminates and flexible packaging materials. Standardized in ASTM D1876.
Relevant Standards
- JIS Z 0237: Testing methods for pressure-sensitive adhesive tapes and sheets
- JIS K 6854: Adhesives — Determination of peel strength of bonded assemblies
- ASTM D903: Peel or stripping strength of adhesive bonds
- ASTM D1876: T-peel test for flexible-to-flexible laminates
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