ASTM D7834-12

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Designation: D7834 − 12
StandardTest Method for
Filling Material Shedding of Paint Brushes
This standard is issued under the fixed designation D7834; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 5. Sampling, Test Specimens, and Test Units
1.1 This test method describes the procedure for testing the 5.1 Sample three identical brushes per test.
shedding properties of both natural bristle and synthetic
filament paint brushes (referred as filling material). 6. Procedure
6.1 Hold the brush test specimen over the white paper with
1.2 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical the filling material facing downward toward the paper at about
a 45° angle and at a distance of 5 to 6 in. (127 to 152.4 mm)
conversions to SI units that are provided for information only
and are not considered standard. above the paper.
1.3 This standard does not purport to address all of the 6.2 Check that the entire filling material is over the paper
safety concerns, if any, associated with its use. It is the surface.
responsibility of the user of this standard to establish appro-
6.3 Insert the teeth of the comb as deep as possible, at
priate safety and health practices and determine the applica-
approximately one third of the filling material length clear from
bility of regulatory limitations prior to use. Some specific
ferrule edge.
hazards statements are given in Section 7 on Hazards.
6.4 Push the comb through the filling material until the teeth
exit the tip of brush at about one stroke per second.
2. Summary of Test Method
6.5 Repeat steps 6.3 and 6.4 ten (10) times on each width
2.1 The amount of filling material removed in this test
side of the brush.
method is calculated to determine the shedding characteristic
of the test sample.
6.6 Pull out any visible filling material that are protruding
from the brush tip by hand and place on the paper.
3. Significance and Use
6.7 Continue to follow steps 6.3 and 6.4 five (5) times on
3.1 During the application of coatings, paint brushes can
each thickness side of the brush.
exhibit shedding of filling material onto the coated surface. A
6.8 Pull out any visible filling material that are protruding
measure of this shedding filling material will determine the
from the brush tip by hand and place on the paper.
paint brush’s ability to resist shedding during application.
6.9 Fan the tip of the brush back and forth with the comb
4. Equipment five times along the width direction and pull out any remaining
loose filling material protruding from the
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