ASTM D5959-12

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Designation: D5959 − 12
Standard Test Method for
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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 4.1.3 Assorted parts shown in Fig. 1 are machined from 304
stainless steel and assembled as shown along with the air valve
1.1 This test method covers a procedure for measuring the
and cylinder just described. The scale must be fixed in place so
weight of filaments per unit volume.
that it reads accurately the diameters of metal standards that are
1.2 This test method is applicable only to monofilament
1.82 in. (46.2 mm) and 2.06 in. (52.3 mm) diameter.
with consistent longitudinal (level) profiles.
4.2 Weighing Device, accurate to 0.1 g to weigh the bundle.
1.3 The values stated in inch-pound units are to be regarded
4.3 Scale, accurate to 0.02 in. (0.5 mm) to measure the
as standard. The values given in parentheses are mathematical
bundle length.
conversions to SI units that are provided for information only
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
4.5 Calibration Standards, 1.82 (46.2 mm) and 2.06 in.
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safety concerns, if any, associated with its use. It is the
(52.3 mm) in diameter.
responsibility of the user of this standard to establish appro-
5. Sampling, Test Specimens and Test Units
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
5.1 The test result will depend on the cross-sectional shape,
the polymer, and the length of the bundle selected for the test.
2. Summary of Test Method
To a lesser extent it will also depend on the filament diameter
since thin filaments pack more efficiently than large ones.
2.1 The weight and volume of a bundle of filaments is
measured, and the bundle density is calculated.
5.2 The device, as pictured in Fig. 1, is designed to measure
diameters ranging from 1.82 to 2.06 in. (46.2 to 52.3 mm).
3. Significance and Use
Make sure that both ends are measured and the results are
averaged.
3.1 Filaments are available in a variety of cross sections and
materials.Ameasure of bulk density permits the brushmaker to
6. Procedure
estimate the weight of filament required to prepare a given
6.1 Select a sample of approximately 2-in. (50-mm) diam-
number of brushes.
eter. Filament may be removed from a sample so the bundle
diameter falls within the scale range (1.82 to 2.06 in.) (46.2 to
4. Apparatus
52.3 mm). One convenient method to adjust the sample
4.1 The apparatus requires some machining, and is as-
diameter to the desired range is to fill a 2-in. (50-mm) inside
sembled as shown in Fig. 1 from the following equipment:
diameter tube. If the sample is too small, like samples may be
2
4.1.1 Air Valve
combined to adjust the bundle diameter to the desired range.
3
4.1.2 Miniature Air Cylinder, dual acting, heavy duty.
6.2 Weigh the sample bundle to the nearest 0.1 g (W). Make
sure that the weight excludes the wrap or rubber bands used to
hold the filament together.
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This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
6.3 Measure the lengths of five individual filaments to the
Subcommittee D01.61 on Paint Application Tools.
nearest 0.02 in. (0.5 mm) with a ruler and average the lengths
CurrenteditionapprovedJune1,2012.PublishedJuly2012.Originallyapproved
to determine bundle length (L).
in 1996. Last previous addition approved in 2007 as D5959 – 96 (2007). DOI:
10.1520/D5959-12.
2
Air valve such as Model 6676 available from Hunt Valve Co., 1913 E. State
Street, Salem, Ohio 44460, or equivalent, has been found suitable for this purpose.
3 9
Miniature air cylinder such as Model H95-5D, ⁄16-in. (14.3-mm) bore, 5-in.
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(127-mm) stoke, dual acting, heavy duty, available from Clippard Instrument Steel cylinders machined to diameters of 1.82 in. with a tolerance of 0.001 in.
Laboratory, 7390 Colerain Road, Cincinnati, OH 45239, or equivalent, has been (46.2 mm with a tolerance of 0.02 mm) and 2.060 in. with a tolerance of 0.001 in.
found suitable for this purpose. (52.3 mm with a tolerance of 0.02 mm).
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D5959 − 12
end of the bundle inside the loop of measuring tape in the
device shown in Fig. 1. Operate the air valve lever 10 times to
stabilize. Actu
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