What is the difference between 180° and 90° peel test?
The peel adhesion test can be used for:
- Quality control – where the glued component needs to meet a minimum bond strength value.
- Adhesive curing – determine the optimum temperature and pressure required to give the maximum bond strength.
- Adhesive behaviour – determine the effect of temperature, humidity and environmental conditions can have on the bond strength.
90° peel test
In 90 degree peel test, a constant 90° angle is maintained whilst the two glued components are peeled apart. The average load required to separate the two, over the length of the specimen is recorded and expressed as N/25mm. Other methods of expressing test results include average peak/trough loads and customer defined calculations.
180° peel test
In 180-degree peel test, a constant 180° angle is maintained whilst the two glued components are peeled apart. The average load required to separate the two, over the length of the specimen is recorded and expressed as N/25mm. Other methods of expressing test results include average peak/trough loads and customer-defined calculations.
At a 180º angle, the result of the peel test is influenced by the thickness and degree of elasticity degree of the PSA tape. At a 90º angle, the result of the peel test is less influenced by these characteristics of the tape and is more reliable and consistent for the evaluation of adhesion and cohesion.
