Standard Test Method for Testing Fracture of Level Paintbrush Filaments

SIGNIFICANCE AND USE
3.1 This method is intended to evaluate filaments for suitability of use in paintbrushes prior to manufacture. Filament fracture resistance is very important because paintbrushes are bent or flexed during painting and it is necessary that the filaments are not permanently deformed with usage.
SCOPE
1.1 This test method covers a procedure for determining the number of fractures present when paintbrush filaments are bent.  
1.2 This method is applicable only to monofilaments with consistent longitudinal cross sectional dimensions commonly referred to as “level” filaments.  
1.3 The values derived are in percent fractured filaments. For example, 2 fractured out of 18 filaments tested = 2/18 or 11 %.  
1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
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 appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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Published
Publication Date
31-May-2017
Current Stage
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ASTM D7233-08(2017) - Standard Test Method for Testing Fracture of Level Paintbrush Filaments
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D7233 − 08 (Reapproved 2017)
Standard Test Method for
Testing Fracture of Level Paintbrush Filaments
This standard is issued under the fixed designation D7233; 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 fracture resistance is very important because paintbrushes are
bent or flexed during painting and it is necessary that the
1.1 This test method covers a procedure for determining the
filaments are not permanently deformed with usage.
number of fractures present when paintbrush filaments are
bent.
4. Apparatus
1.2 This method is applicable only to monofilaments with
4.1 The apparatus for this method is shown in Fig. 3.
consistent longitudinal cross sectional dimensions commonly
Filaments are secured between two clamps. The handwheel on
referred to as “level” filaments.
the front of the gauge is rotated to bring the ends of the
1.3 The values derived are in percent fractured filaments.
filaments toward each other as measured by the dial indicator
For example, 2 fractured out of 18 filaments tested = ⁄18 or
at the top of the gauge.
11 %.
4.2 Thedeviceisverydelicateandcareshouldbeusedinits
1.4 The values stated in inch-pound units are to be regarded
operation. To prevent instrument damage, the clamps must not
as standard. The values given in parentheses are mathematical
be brought together closer than a reading of 0.750 in. (19.0
conversions to SI units that are provided for information only
mm) on the dial indicator.
and are not considered standard.
5. Sampling, Test Specimens and Test Units
1.5 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
5.1 Record the polymer type, filament size and filament
responsibility of the user of this standard to establish appro- cross-sectional shape.
priate safety and health practices and determine the applica-
5.2 The sample filaments shall be conditioned for one (1) h
bility of regulatory limitations prior to use.
at73.5 63.5°F(23.0 62.0°C)and50 65 %relativehumidity.
1.6 This international standard was developed in accor-
5.3 The sample filaments shall be cut to a minimum of 1.5
dance with internationally recognized principles on standard-
in. (38.1 mm).
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
5.4 Thedistancebetweenclampsonthetestunitshallbe1.0
mendations issued by the World Trade Organization Technical
in.(25.4mm)atareadingof0.0(zerodeflection).(SeeFig.4.)
Barriers to Trade (TBT) Committee.
6. Procedure
2. Summary of Test Method
6.1 Select three distinct sections of the bundle, box or lot of
2.1 Filaments are clamped in place and bent to a specific
filaments to be evaluated. Do not include filaments from the
displacement. While bent and still in the fixture, they are
perimeter of a bundle. Pull six (6) filaments from each section
evaluated for fracture by visually determining whether the
at equally dispersed intervals.
filamentshavecrackedorbeenpermanentlydeformedandwill
6.2 Set the clamps in a parallel horizontal position with the
not recover to virtually straight filaments. (See Fig. 1 and Fig.
dial indicator set at 0.0 (zero deflection). (See Fig. 4.)
2).
6.3 Place the six (6) filaments in the clamps. Be sure that no
3. Significance and Use
filamentoverlapsorisontopofanotherfilament.Closeclamps
3.1 This method is intended to evaluate filaments for suit-
to secure.
ability of use in paintbrushes prior to manufacture. Filament
1 2
This test method is under the jurisdiction of ASTM Committee D01 on Paint The sole source of supply of the assembled fracture gauge test device known to
and Related Coatings, Materials, andApplications and is the direct responsibility of the committee at this time is T. S. Simms and Co., 33 Bridge Rd.,
...

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