ASTM D6957-03

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D6957–03
Standard Practice for
Measuring Curl in Paint Brush Filling Material
This standard is issued under the fixed designation D 6957; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This practice describes the procedure for measuring curl
in synthetic filament.
1.2 This practice is applicable to filament 2 to 5 in. (50.8 to
127 mm) in length.
1.3 This practice is applicable to tapered filament or level
filament.
1.4 The values given in-pound units are to be regarded as
the standard as this is the dominant measurement system used
in the paint brush industry. The values given in parentheses are
for information only.
1.5 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
2. Terminology
2.1 Definitions of Terms Specific to This Standard:
2.1.1 paint brush filament, n—a synthetic polymer extrusion
used in brushing material.
2.1.2 filament curl, n—deviation from straight, along the
length of a filament.
2.1.3 butt-end, n—the larger end of a tapered filament;
either end of a level filament.
3. Significance and Use
3.1 It is important for the manufacturing and performance of
a brush to have filaments with minimal curl.
4. Apparatus
4.1 Filament curl deviation chart. See Fig. 1.
FIG. 1 Filament Curl Deviation Chart
5. Procedure
5.1.3 Place a filament on the filament curl deviation chart
5.1 For Testing Synthetic Filaments:
with butt-end at the x-reference point (see Fig. 1).
5.1.1 Select filaments to be measured.
5.1.4 Record the degree of deviation from strai
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