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What is the difference between 90 degree and 180 degree peel test?

The difference between a 90-degree peel test and a 180-degree peel test lies in the angle at which the peel force is applied during the test. These tests are commonly used to evaluate the adhesive strength and bond quality of adhesive materials, tapes, coatings, laminates, or any other bonded structures.

In a 90-degree peel test:

1. Peel Angle: The peel angle is set at 90 degrees, meaning the bonded surfaces are peeled apart in a perpendicular direction. The peel force is applied in a direction parallel to the plane of the bonded surfaces.

2. Test Configuration: The test specimen is typically a strip or tape with one end attached to a fixed surface or fixture, while the other end is held by a testing machine or grip. The specimen is peeled off the fixed surface at a 90-degree angle, and the force required is measured.

3. Peel Force Measurement: The testing machine measures and records the force required to peel the specimen away from the fixed surface at a 90-degree angle. This force is usually measured continuously throughout the test or at specific intervals.

In a 180-degree peel test:

1. Peel Angle: The peel angle is set at 180 degrees, meaning the bonded surfaces are peeled apart in opposite directions, creating a sharper angle. The peel force is applied in a direction away from the plane of the bonded surfaces.

2. Test Configuration: Similar to the 90-degree peel test, the test specimen is a strip or tape with one end attached to a fixed surface or fixture. However, in a 180-degree peel test, the other end is folded back on itself, creating a loop. The loop is then pulled apart to peel the bonded surfaces in opposite directions.

3. Peel Force Measurement: The testing machine measures and records the force required to separate the looped end of the specimen and peel it away from the fixed surface. The force is measured continuously throughout the test or at specific intervals.

Desktop Computer Type Universal Test Machine HZ-10...

The choice between a 90-degree peel test and a 180-degree peel test depends on several factors, including the specific application, industry standards, and the nature of the bonded surfaces. Each test configuration can provide valuable insights into the adhesive strength and bond quality of the materials being tested. It is important to follow the relevant testing standards or specifications to ensure consistent and accurate results.