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Question:

How to test the adhesion of protective film?

nan

Answer:

There's a special equipment for tension testing! The protective film you are saying may be silicone PET, generally having adhesion of 2 g - 10 g. High-quality ones have excellet performence in eliminating bubbles.
I really suggest you not to use films with glue. It's harmful to your screen. You will regret when you tear it down. I am using OK8 film based on static. This kind of film is easy to coat. And it won't harm the screen. Though its adhesion is low, do NOT use glue.
This is kind of test is called performance test. Taking five layers of the protective film as the teat specimens and test separately according to GB/T 7124. And the final result will be the arithmetic average of the results of the five teat specimens. By the way, what kind of thing do you use the film on?

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