Regarding this issue, we have also referred to some standards at home and abroad, and some technical personnel in the coating industry have provided the following general references:

The 90 degree and 180 degree peeling are just different testing angles, and the data tested for different products do not have a corresponding relationship

There is no absolute statement that the value of the angle test is high After all, it refers to two different standards, and my personal understanding is mainly due to being

The types of tape used for testing are different The double-sided tape of PET and Tissue substrates is generally subjected to a 180 degree peel test. And some adhesive films or 3M

VHB foam tape is subjected to a 90 degree peel test. If tested at 180 degrees, there may be a shock phenomenon (i.e. data)

The sharp fluctuation of the curve affects the accuracy of the data.

So theoretically, there is no relationship between the test results from different perspectives, and it is impossible to convert them into conclusions!

However, when selecting materials, there may be excessive thickness of the substrate for certain tapes or protective films, such as PET double-sided tape with a thickness of 150 μ m or more

Or test with protective film. Due to the excessive thickness, hardness, and rebound force of the substrate, the adhesive tape is tested to be adhered to during the 90 ° test

The angle and rebound force of the steel plate are less than the 180 ° test method. At this point, the adhesion test result will be greater than 180 °. stickiness

The lower the tape or protective film, the greater the distance between the results. Conversely, the smaller. If the adhesion force reaches a certain level of high viscosity, then

There will be no different angles, and the same tape or testing equipment will produce different data!

In summary, there is some understanding of the relationship between the values of 90 degree peeling force and 180 degree peeling force, as well as whether they can be converted!