A more universal test is the probe test, in which the end of a cylinder of standard
diameter is brought lightly into contact with the film for a very short time and the
force required to separate it from the surface is measured. Similar in principle is
the loop tack test, in which a loop of coated film is lowered onto a steel plate, making
contact under its own weight, and the force required to withdraw the plate is then
measured. All of these tests are markedly affected by the cleanliness of the ball, probe,
or plate. Figure 4 illustrates the loop tack test.
A more universal test is the probe test, in which the end of a cylinder of standarddiameter is brought lightly into contact with the film for a very short time and theforce required to separate it from the surface is measured. Similar in principle isthe loop tack test, in which a loop of coated film is lowered onto a steel plate, makingcontact under its own weight, and the force required to withdraw the plate is thenmeasured. All of these tests are markedly affected by the cleanliness of the ball, probe,or plate. Figure 4 illustrates the loop tack test.
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