Leneta Scrup Test Panel
Scrub Test Panels
Black Plastic-Vinyl Chloride/Acetate Copolymer. Smooth Matte Surface -
Thickness: 10 mils (0.25 mm) - Size: 6-1/2 x 17 in (165 x 432 mm)
Used in ASTM D 2486, ASTM D 4213, ISO 11998 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 equivalent
loss in film thickness.
Fig. 1 Typical Failure Using Shim
per D2486, Method A.
Fig. 2 Typical Failure Without Shim
The above photographs show actual tests of latex flat paints.
Note that the films have worn down
to a feather edge, with no sign of adhesion failure.
ALSO AVAILABLE: WHITE SCRUB TEST PANELS - FORM P122-10N
Used with dark colored paints for contrast. Same physical properties as Form
PACKAGING: 100 per box, 5 boxes per case.
Calibration Scrub Test Panels
|Poor Scrub Resistance
||Good Scrub Resistance
||Very Good Scrub Resistance
|* 80 cycles-to-failure
||* 900 cycles-to-failure
* Typical Values per
ASTM D2486, Method A
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
||x 100 **
|Calibration Panel Cycles-to-Failure
** The letter indicating the calibration panel type is appended to the
calibration rating, e.g. 125A, 65C, 95D etc.
Illustrates simultaneous side-by-side scrubbing of half-panels to maximize
correlation, analogous to ASTM D 2486, Method B.
NOTE: See also ASTM D 4213 “Weight Loss Method” whereby:
|Calibration Rating =
Calibration Panel Weight Loss
Test Panel Weight Loss
PACKAGING: 3 per box, 4 boxes per case.