Scrub Resistance Testing Paint Panels
Article No. 12780
Leneta P121-A Scrub Calibration Panel
These are standard panels prepared by applying white emulsion paints on black scrub test panels.
Features
- 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 rating, e.g. 125A, 65C, 95D etc.
Note: ASTM D 4213 “Weight Loss Method” whereby:
Calibration Rating = Calibration Panel Weight Loss/Test Panel Weight Loss x 100
Technical Attributes
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- Data
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Scrub Resistance: Low Cycles to Failure: 80 Quantity Per Box: 3 Boxes per Case: 4
Standards
1 Typical Values per ASTM D2486, Method A
Procedure
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 equivalent loss in film thickness.
As paints are gradually worn down during the scrubbing process, a feathered edge” is produced which allows for a more precise determination of the end point.