METHOD 4061.3
March 22, 2001
4.6 Requirements.
4.6.1 Test paper. Kraft paper test sheets (90# basis weight) that when conditioned in accordance
with the standard method of the Technical Association and the Pulp and Paper Industry, conforms
to the following requirements (see 5.2).
90 ± 4.5
Basis weight (24 x 36/500), pounds
0.0070 ± 0.0005
Thickness, inches
40 ± 15
Smoothness, Gurley, R.C.
T.S.
60 ± 20
W.S.
210 ± 50
Smoothness, Sheffield
T.S.
130 ± 30
W.S.
120 ± 30
Water resistance, average, seconds
Bursting strength, points
75-105
4.6.2 Bearing weight. Use a steel cylinder 2 inches in diameter, weighing 6.2 pounds.
4.6.3 Procedure. Lay a 2.0 by 2.8 inch piece of the test paper on the film, and place the cylinder
on the paper. At the end of 5 seconds remove the cylinder and invert the test panel. The film shall
be considered free from after-tack when the paper drops off the test film within 10 seconds.
4.7 Dry.
4.7.1 Paints and enamels. Test the film with a finger using moderate pressure. The film shall be
considered dry when the soft tacky condition no longer exists and the film feels firm.
4.7.2 Drying oils. Lightly rub the finger across the surface of the test films. The film shall be
considered dry when it no longer adheres to the finger and does not rub up appreciably.
4.7.3 Dry-through for varnish, lacquers, and enamels. Place the test panel in a horizontal position
at a height such that, when the thumb is placed horizontally on the film, the arm of the operator is in
a vertical straight line from wrist to shoulder. Bear downward on the film with the thumb, exerting
the maximum pressure of the arm, at the same time turning the thumb through an angle of 90
degrees in the plane of the film. The film shall be considered dry-through when no loosening
detachment, wrinkling, or other distortion of the film occurs.
4.7.4 Dry-hard time. With the end of the thumb resting on the test film and the forefinger
supporting the test panel, exert a maximum downward pressure (without twisting) of the thumb on
the film. Lightly polish the contacted area with a soft cloth. The film shall be considered dry-hard
when any mark left by the thumb is completely removed by the polishing operation.
4.7.5 Dry-to-recoat. A film shall be considered dry for recoating when second coat or specified
topcoat can be applied without the development of film irregularities, such as lifting or loss of
FED. TEST METHOD STD. 141D
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