Note 4 permacel p99 tape previously identiļ¬ed as suitable for this purpose was withdrawn from manufacture in july 2009.
Powder coating tape test.
Essential that tape from the same batch be used when tests are to be run in different laboratories.
An acceptable result will show only a little of the powder coming off from the grid cuts.
Results should be no lifting of the cured powder between scribe lines.
8 3 for test panels report the substrate employed the type of coating the method of cure and the environmental conditions at the time of testing.
By far the most prevalent test for evaluating coating adhesion is the tape and peel test which has been used since the 1930 s.
As with most people trying to obtain results using the tape test my frustration was with the variation in the method more so than the tape.
The x cut tape test is primarily intended for use at job sites.
No coating removal is a good pass.
The crosshatch test is designed to test the adhesion of the powder coating to the metal substrate.
The x cut tape test and the cross hatch tape test.
In its simplest version a piece of adhesive tape is pressed against the paint film and the resistance to and degree of film removal observed when the tape is pulled off.
8 4 if the adhesion strength of the tape has been determined in accordance with test methods d 1000 or d 3330 report the results with the adhesion rating s.
Tapes and adhesion testing for powder coating.
If a square or two of coating is removed adhesion can be.
Pressed down real good and then the tape is removed.
The test is performed by making a series of cuts through the coating.
The more paint that is removed the worse the overall grade would be.
Generally the pass fail is graded on a progressive scale.
Last angle the tape at approximately 45 degrees then firmly holding the end of the tape give it a fast pull off the surface.
I usually test 2 3 surface areas on the specimen to determine an overall average.
The most common areas to test for basic powder coating functionality are.
Allow to stand for 30 seconds.
There are two variants of this test.
This test is easy and a must for checking powder coating adhesion.
Apply any sticky tape then remove slowly.
Pressure sensitive tape is applied and removed over cuts made in the coating.
It s performed by cutting a crosshatched grid pattern into the coating all the way down to the substrate.
That area is then judged to see if any paint was removed from the cross sections that were cut.
If this is not possible the test method should be used only for ranking a series of test coatings.
A special pressure sensitive tape is then applied to the crosshatched area and then removed quickly at close to a 180 degree angle.
