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Peeling test

Peel testing is a basic mechanical test used to measure the performance of adhesive bonds. Peeling test involves applying a tensile force to a flexible substrate joined by an adhesive, which can be bonded to another flexible substrate (such as tape, film, or rubber) or a rigid substrate (such as metal, rigid plastic, or composite). UnitedTest have a wide range of peel testing equipment that can be configured for your exact test application. 

UnitedTest peeling test fixtures

Feature:

  • ASTM D3330, 90 degree peeling

Key parameter:

  • Load: 1000N
Details

Feature:

  • ISO 11339, T peel

Key parameter:

  • Load: 1000N
Details

Feature:

  • ASTM C794

Key parameter:

  • Load: 1000N
Details

Feature:

  • ASTM D1876

Key parameter:

  • Load: 1000N
Details

Feature:

  • ASTM D1876

Key parameter:

  • Load: 1000N
Details

Feature:

  • ISO 8510-2

Key parameter:

  • Load: 500N
Details

What's peeling test?

Peel testing is essential for evaluating the adhesion strength and failure mode between two flexible materials joined by an adhesive or coating. It measures how well an adhesive bond holds two substrates, or materials together. A flexible substrate is gradually pulled away from a rigid or a second flexible substrate at a specific angle and the force required to cause separation is measured.Peel testing is used in a wide range of different industries including packaging, automotive, medical devices, electronics, construction, aerospace, textiles, and consumer products.


Why Is Peel Testing Important?

Peel testing is crucial for industries like medical devices, packaging, electronics, and construction where bonding is critical. Peel tests confirm the right adhesives and substrates, production processes, product quality, and reduce in-field failures. They improve the chances of meeting the goal of creating stronger, more durable, and specialized bonds.


Peel testing is important for several key reasons across various important functions:

In Quality Control and Assurance, peel testing quantifies the force needed to separate bonded materials. That helps maintain product consistency and prevent product failures. 

In Research and Development, peel tests aid in the selection of optimal adhesives and substrates for specific applications, allowing companies to make informed material choices. 

Meeting Industry Standards requires peel tests so that their products comply with specific industry standard test methods for peel strength. 

Problem Solving and Failure Analysis is performed in corporate test labs to understand root causes of product failures and to improve product reliability.


Peel testing is an essential tool to improve product quality, drive innovation, meet regulatory requirements, and deliver safe and reliable products to consumers.

Types of peel test

One of the most unique things about peel testing is the number of varieties it has and the fact that most can be tested with one Universal Testing Machine. The most common peel testing types include: 

180°-peel

The 180°-peel test measures the load per unit needed to separate bonded materials using an 180° angle of separation. It is suitable for testing a flexible material that is bonded to a rigid substrate. 

90°-peel 

The 90°-peel test measures the load per unit needed to separate bonded materials using a 90° angle of separation. It is suitable for testing a flexible material that is bonded to a rigid substrate. 

T-peel

This tensile test for two flexible substrates that have been bonded together. The substrates are placed into peel test grips so that one sticks up, the other sticks down and the bonded area sticks out horizontally, which forms a “T” shape. 

Peel wheel testing

This test, which is also sometimes referred to as the climbing drum peel test, is suited for testing the bond between a flexible material and a rigid substrate. It is easy to set up and perform but less popular than 180° and 90° tests.  

Floating roller peel testing 

Suitable for testing rigid or semi-rigid substrate and a flexible material, this method uses rollers that are generally set at 90° or 115°. The materials are passed through the rollers and attached to another grip that is attached to the tensile tester, which measures the force needed to separate the bond.  


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