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测试方法一:
A . apply a chalky coating on substrate, which thickness varies from 85 microns to 5*85 microns.
B . this may be obtained by applying from one to five coats over the surface, leaving each time a part of the previous layer uncoated. Drying time between layers is 24 hours at 2323°C §50 % R.H.
C . Apply primer to be tested, different primers can be tested next to each other.
D . let it dry for 24 hours, apply a pressure sensitive tape and then peel off.
E. visual evaluation on how many chalky coating layers are peeled off gives an idea of the consolidation power, which is a combination of penetration and binding power scale from 0 to 5 (fiv being excellent with no chalky coating pick up). |
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