In a typical scrub test, the coating is applied to the Leneta Scrub Test Panel at a specified film thickness, allowed to dry, then subjected to scrubbing with a straight-line scrub tester.

In ASTM D2486, a 10mil shim is inserted under the panel to accelerate failure and thereby reduce testing time. The scrub resistance is the number of scrub cycles required to remove the coating to a specified end point. Alternatively, the loss in weight is determined after a specified number of scrub cycles as a measure of scrub resistance, with calculation of equivalent loss in film thickness.

Used in ASTM D2486, ASTM D4213, ISO 11918 and Other Scrub Test Methods.

Fig. 1 and Fig. 2 show actual tests of latex flat paints. Note the films have worn down to a feather edge, with no sign of adhesion failure.