ASTM D7233-08

Standard Test Method for Testing Fracture of Level Paintbrush Filaments

SIGNIFICANCE AND USE
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 =  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.

General Information

• Status: Historical
• Publication Date: 31-Oct-2008
• ICS: 87.100 - Paint coating equipment
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.61 - Paint Application Tools

Relations

• Replaced By: ASTM D7233-08(2012) - Standard Test Method for Testing Fracture of Level Paintbrush Filaments
• Effective Date: 01-Nov-2012

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D7233 − 08
StandardTest 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 4. Apparatus
4.1 The apparatus for this method is shown in Fig. 3.
1.1 This test method covers a procedure for determining the
Filaments are secured between two clamps. The handwheel on
number of fractures present when paintbrush filaments are
the front of the gauge is rotated to bring the ends of the
bent.
filaments toward each other as measured by the dial indicator
1.2 This method is applicable only to monofilaments with
at the top of the gauge.
consistent longitudinal cross sectional dimensions commonly
4.2 Thedeviceisverydelicateandcareshouldbeusedinits
referred to as “level” filaments.
operation. To prevent instrument damage, the clamps must not
1.3 The values derived are in percent fractured filaments.
be brought together closer than a reading of 0.750 in. (19.0
For example, 2 fractured out of 18 filaments tested = ⁄18 or mm) on the dial indicator.
11 %.
5. Sampling, Test Specimens and Test Units
1.4 The values stated in inch-pound units are to be regarded
5.1 Record the polymer type, filament size and filament
as standard. The values given in parentheses are mathematical
cross-sectional shape.
conversions to SI units that are provided for information only
and are not considered standard.
5.2 The sample filaments shall be conditioned for one (1) h
at73.5 63.5°F(23.0 62.0°C)and50 65 %relativehumidity.
1.5 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 5.3 The sample filaments shall be cut to a minimum of 1.5
responsibility of the user of this standard to establish appro- in. (38.1 mm).
priate safety and health practices and determine the applica-
5.4 Thedistancebetweenclampsonthetestunitshallbe1.0
bility of regulatory limitations prior to use.
in.(25.4mm)atareadingof0.0(zerodeflection).(SeeFig.4.)
2. Summary of Test Method
6. Procedure
2.1 Filaments are clamped in place and bent to a specific
6.1 Select three distinct sections of the bundle, box or lot of
displacement. While bent and still in the fixture, they are filaments to be evaluated. Do not include filaments from the
evaluated for fracture by visually determining whether the
perimeter of a bundle. Pull six (6) filaments from each section
filamentshavecracked or been permanently deformedandwill at equally dispersed intervals.
not recover to virtually straight filaments. (See Fig. 1 and Fig.
6.2 Set the clamps in a parallel horizontal position with the
2).
dial indicator set at 0.0 (zero deflection). (See Fig. 4.)
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
6.4 Rotate the handwheel counterclockwise to deflect the
fracture resistance is very important because paintbrushes are
filaments until the dial indicator reads 0.650 in. (16.5 mm)
bent or flexed during painting and it is necessary that the
travel distance (see Fig. 5).
filaments are not permanently deformed with usage.
The sole source of supply of the assembled fracture gauge test device known to
This test method is under the jurisdiction of ASTM Committee D01 on Paint the committee at this time is T. S. Simms and Co., 33 Bridge Rd., St. John, New
and Related Coatings, Materials, andApplications and is the direct responsibility
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