ASTM D7233-08(2017)
(Test Method)Standard Test Method for Testing Fracture of Level Paintbrush Filaments
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.
General Information
- Status
- Published
- Publication Date
- 31-May-2017
- Technical Committee
- D01 - Paint and Related Coatings, Materials, and Applications
- Drafting Committee
- D01.61 - Paint Application Tools
Relations
- Replaces
ASTM D7233-08(2012) - Standard Test Method for Testing Fracture of Level Paintbrush Filaments - Effective Date
- 01-Jun-2017
Overview
ASTM D7233-08(2017): Standard Test Method for Testing Fracture of Level Paintbrush Filaments provides a standardized procedure for determining the fracture resistance of individual paintbrush filaments before manufacturing. Developed by ASTM International, this method ensures that monofilament paintbrush filaments, specifically those with consistent longitudinal cross-sectional dimensions (referred to as "level filaments"), are rigorously evaluated for their ability to withstand the bending and flexing stresses encountered during practical paint application.
Paintbrushes are subject to continuous bending and flexing during use. It is essential to guarantee that their filaments do not become permanently deformed or fractured, as this can affect brush performance, finish quality, and durability. ASTM D7233 serves as a quality control measure for brush manufacturers and suppliers, supporting consistent product performance and customer satisfaction.
Key Topics
Test Method Scope:
- Applicable solely to monofilament ("level") paintbrush filaments.
- Determines the number and percentage of filaments that fracture when subjected to standardized bending.
Sampling and Preparation:
- Requires proper documentation of filament polymer type, filament size, and cross-sectional shape.
- Samples must be conditioned at specified temperature and relative humidity before testing.
Testing Procedure:
- Filaments are clamped and bent using a specifically designed gauge.
- After bending to a predetermined displacement, filaments are visually inspected for fractures or permanent deformation.
Reporting and Calculation:
- Results are reported as a percentage of fractured filaments, calculated by dividing the number of fractured filaments by the total filaments tested.
Precision and Reproducibility:
- Emphasizes the importance of repeatability in laboratory settings, with established parameters for interlaboratory precision.
- Highlights factors that can influence results, such as filament shape, material, and environmental conditions.
Applications
ASTM D7233-08(2017) is a crucial quality control tool in the paintbrush manufacturing industry. Practical uses include:
- Pre-Manufacture Evaluation:
- Ensures selected filament materials meet durability requirements before integration into finished paintbrushes.
- Supplier Quality Assurance:
- Allows for objective assessment of raw filament quality, preventing the inclusion of substandard materials in production.
- Product Development:
- Helps research and development teams select filament materials with optimal fracture resistance for performance-critical or specialty brushes.
- Troubleshooting and Failure Analysis:
- Identifies causes of paintbrush filament failure in finished goods and supports continuous improvement programs.
Using this standard assures buyers, end-users, and regulatory bodies that paintbrushes are manufactured using filaments with reliable flexural properties, leading to improved longevity and consistent painting results.
Related Standards
Professionals using ASTM D7233-08(2017) may also refer to related standards in the paint application tools and coatings sector, including:
- ASTM D5023 - Standard Test Method for Plastics: Hydrolytic Stability of Polymers
- ASTM D4848 - Standard Test Method for Determining the Flexural Fatigue of Plastics
- ASTM D3451 - Guide for Testing Coating Powders and Powder Coatings
- ISO 1302 - Indication of Surface Texture in Technical Product Documentation
Implementing ASTM D7233-08(2017) within a broader quality framework supports manufacturers in meeting international compliance requirements and maintaining competitive advantage in the global marketplace.
Frequently Asked Questions
ASTM D7233-08(2017) is a standard published by ASTM International. Its full title is "Standard Test Method for Testing Fracture of Level Paintbrush Filaments". This standard covers: 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.
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.
ASTM D7233-08(2017) is classified under the following ICS (International Classification for Standards) categories: 87.100 - Paint coating equipment. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM D7233-08(2017) has the following relationships with other standards: It is inter standard links to ASTM D7233-08(2012). Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM D7233-08(2017) is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
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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