There are numerous test methods that are used to measure the strength of an adhesive including cleavage, peel, tension or shear tests. Out of these, Peel tests are common for labels, tapes, coatings, and other bonded materials. There are many types of peel tests, including T shaped Peel testing, 180 degree peel testing and 90 degree peel testing.
Why would you perform the T-Peel test instead of the 180 or 90 degree test? Well, the 180 and 90 degree tests are commonly used where a flexible material with an adhesive or other bonding method adheres to a more rigid substrate. Most probably, you will use the 90 degree test method over the 180 degree peel test if your supple substrate cannot be bent cleanly back to 180 degrees. The T-Peel is preferred when both materials are flexible or if both are similar.
The T-Peel test requires that both of the bonded substrates are flexible. This means that they need to bend up to 90 degree angle without splitting. Also, both the substrates do not require to be same.
Here is the quick summary of standard specifications to judge whether the test is right for you or not and to check out which equipments you need to perform the test.
– A set of two tensile grips to securely hold each peel substrate.
– Software to calculate the average load and peak load between extension points
Load a sample on the peel tester with each end on opposing tensile grips.
Now start the machine to separate the grips at a determined speed throughout the length of the test sample.
Now record average load and peak load.
For more information on packaging testing instruments, contact our expert.