GB/T 1762-1980: Method of test for after-tack of paint films

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Materials and instruments
Filter paper. Medium-speed quantitative filter paper, 20×20 mm;
After-tack tester. 500 grams, base area of 1 cm², flat and smooth surface required, as
shown in the figure.
Tinplate. 50×120×0.2~0.3 mm;
Temperature and humidity control chamber. model DL302;
Magnifying glass. 4x.