(2) Black/White Plastic-Vinyl Chloride/Acetate Copolymer Smooth Matte Surface - Plasticizer Free Used in ASTM D 2486, ASTM D 4213, ISO 11918 and Other Scrub Test Methods
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 D 2486, a 10 mil 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 ...
(2) These are standard panels prepared by applying white emulsion paints on black scrub test panels. The films are indefinitely stable and the panels of each type essentially identical. They are used as controls in the measurement of scrub resistance, to obtain Calibration Ratings that normalize the wide variations often encountered for undefined reasons, among laboratories using the same scrub method. The Calibration Rating is the performance of the test paint panel expressed as a percentage relative to that of the selected Calibration Panel. Thus:
% Calibration Rating = Test Panel Cycles-to Failure/Calibration Panel Cycles-to-Failure x 100
The letter indicating the calibration panel type is appended to the calibration ...