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.
Powder coating tape test.
There are two variants of this test.
If this is not possible the test method should be used only for ranking a series of test coatings.
Generally the pass fail is graded on a progressive scale.
Note 4 permacel p99 tape previously identiļ¬ed as suitable for this purpose was withdrawn from manufacture in july 2009.
That area is then judged to see if any paint was removed from the cross sections that were cut.
Pull the tape off aggressively and look at the tape and the part.
Apply any sticky tape then remove slowly.
The most common areas to test for basic powder coating functionality are.
Pressure sensitive tape is applied and removed over cuts made in the coating.
Essential that tape from the same batch be used when tests are to be run in different laboratories.
The more paint that is removed the worse the overall grade would be.
Last angle the tape at approximately 45 degrees then firmly holding the end of the tape give it a fast pull off the surface.
Allow to stand for 30 seconds.
The test is performed by making a series of cuts through the coating.
If a square or two of coating is removed adhesion can be.
On metal substrates a more formal version of the knife test is the tape test.
I usually test 2 3 surface areas on the specimen to determine an overall average.
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.
5 chemical resistance test astm d1308 place approximately 10 drops of test solvent consisting of 95 by weight toluene and 5 by weight methal ethyl keytone on the surface of the coating.
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.
Results should be no lifting of the cured powder between scribe lines.
An acceptable result will show only a little of the powder coming off from the grid cuts.
This test is easy and a must for checking powder coating adhesion.
No coating removal is a good pass.
A special pressure sensitive tape is then applied to the crosshatched area and then removed quickly at close to a 180 degree angle.
By far the most prevalent test for evaluating coating adhesion is the tape and peel test which has been used since the 1930 s.
The x cut tape test is primarily intended for use at job sites.
The x cut tape test and the cross hatch tape test.
The crosshatch test is designed to test the adhesion of the powder coating to the metal substrate.
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.
