ASTM D5959-12(2017)

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: D5959 − 12 (Reapproved 2017)
Standard Test Method for
Bulk Density of Level Paintbrush Filaments
This standard is issued under the fixed designation D5959; 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 4.1.2 Miniature Air Cylinder, dual acting, heavy duty.
4.1.3 Assorted parts shown in Fig. 1 are machined from 304
1.1 This test method covers a procedure for measuring the
stainless steel and assembled as shown along with the air valve
weight of filaments per unit volume.
and cylinder just described. The scale must be fixed in place so
1.2 This test method is applicable only to monofilament
that it reads accurately the diameters of metal standards that are
with consistent longitudinal (level) profiles.
1.82 in. (46.2 mm) and 2.06 in. (52.3 mm) diameter.
1.3 The values stated in inch-pound units are to be regarded
4.2 Weighing Device, accurate to 0.1 g to weigh the bundle.
as standard. The values given in parentheses are mathematical
4.3 Scale, accurate to 0.02 in. (0.5 mm) to measure the
conversions to SI units that are provided for information only
bundle length.
and are not considered standard.
4.4 Air Supply, with pressure regulator set for 50 psig.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4.5 Calibration Standards, 1.82 (46.2 mm) and 2.06 in.
responsibility of the user of this standard to establish appro-
(52.3 mm) in diameter.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. 5. Sampling, Test Specimens and Test Units
1.5 This international standard was developed in accor-
5.1 The test result will depend on the cross-sectional shape,
dance with internationally recognized principles on standard-
the polymer, and the length of the bundle selected for the test.
ization established in the Decision on Principles for the
To a lesser extent it will also depend on the filament diameter
Development of International Standards, Guides and Recom-
since thin filaments pack more efficiently than large ones.
mendations issued by the World Trade Organization Technical
5.2 The device, as pictured in Fig. 1, is designed to measure
Barriers to Trade (TBT) Committee.
diameters ranging from 1.82 to 2.06 in. (46.2 to 52.3 mm).
Make sure that both ends are measured and the results are
2. Summary of Test Method
averaged.
2.1 The weight and volume of a bundle of filaments is
measured, and the bundle density is calculated.
6. Procedure
3. Significance and Use
6.1 Select a sample of approximately 2-in. (50-mm) diam-
eter. Filament may be removed from a sample so the bundle
3.1 Filaments are available in a variety of cross sections and
diameter falls within the scale range (1.82 to 2.06 in.) (46.2 to
materials.Ameasure of bulk density permits the brushmaker to
52.3 mm). One convenient method to adjust the sample
estimate the weight of filament required to prepare a given
diameter to the desired range is to fill a 2-in. (50-mm) inside
number of brushes.
diameter tube. If the sample is too small, like samples may be
4. Apparatus
combined to adjust the bundle diameter to the desired range.
4.1 The apparatus requires some machining, and is as-
6.2 Weigh the sample bundle to the nearest 0.1 g (W). Make
sembled as shown in Fig. 1 from the following equipment:
sure that the weight excludes the wrap or rubber bands used to
4.1.1 Air Valve
hold the filament together.
This test method is under the jurisdiction of ASTM Committee D01 on Paint
3 9
and Related Coatings, Materials, andApplications and is the direct respons
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