What does peel strength mean?

Peel strength is a measure of the adhesive strength between two or more materials that have been bonded together. Peel testing is used to calculate peel strength and then to determine the effectiveness of adhesives in connecting certain types of materials.

Climbing drum test is a typical peeling test method used to determine the delamination characteristics of adhesives used to bond different materials together. This test covers the determination of the adhesive peel resistance between a relatively flexible adhesive and the relatively flexible surface of the sandwich structure and its core.

When using relatively brittle adhesives, peel resistance typically indicates the degree of curing, meaning that values higher than typically achieved may indicate incomplete curing. This test involves measuring the adhesive strength between the laminated board and the substrate. It is equal to the applied tensile load divided by the sample width multiplied by the sample thickness.

Peel strength testing is common in adhesive testing, including medical adhesives.

Peel strength is the average force required to separate two adhesive materials from each other, and is a characteristic suitable for various industries such as aerospace, automotive, adhesives, packaging, biomaterials, microelectronics, etc. The peel test data is used to determine the quality of the adhesive joint and provide information on the influence of process and environment on the adhesive substrate interface strength, where applicable.

How to measure peel strength:

Peel test is a constant speed test in the tensile direction. In material testing, peel strength is calculated by measuring and averaging the load on the peeled specimen and dividing the average load by the unit width of the adhesive line. The load data used in the calculation of peel strength comes from the flat part of the load position curve.

Types of peel tests:

A universal testing machine equipped with a peeling fixture is used for conducting peeling tests. Just replace the fixture, and the same universal testing machine can run various peeling test methods. The main difference between these methods lies in the angle of detachment.

Common peel tests include:

45 degree peel test

Most suitable for the food packaging industry

90 degree peel test

Common peeling test methods using a 90 degree peeling fixture for operation

180 degree peel test

Peeling test method, in which the peeling arm is clamped in the stretching gripper and pulled apart

180 degree T-shaped peel test

Most commonly used for thin metal adhesives

Minimum peel strength value

Climbing drum peeling test

Peel testing device for peeling samples with a constant peeling radius

Common peel testing standards include:

Testing standard: GB/T 2792-2014 Test method for peel strength of adhesive tapes

ASTM D903- Standard Test Method for Adhesive Peel or Peel Strength

ASTM D1876- Standard Test Method for Adhesive Peel Resistance (T-peel Test)

ASTM D3167- Standard Test Method for Peel Resistance of Adhesive Floating Rollers

ASTM D3330- Standard Test Method for Peel Adhesion of Pressure Sensitive Tape

ASTM D6195- Standard Test Method for Cyclic Viscosity

ASTM D1000-17 Test Method for Pressure Sensitive Adhesive Tape for Electrical and Electronic Equipment



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