ASTM D5068-02

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Designation: D 5068 – 02
Standard Practice for
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Preparation of Paint Brushes for Evaluation
This standard is issued under the fixed designation D 5068; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 6. Materials
1.1 This practice describes the preparation of paint brushes 6.1 Test Paint.
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for evaluation. 6.2 Brush-Out Panels, or other typical panels to be used.
1.2 This practice is applicable to paint brushes 2 to 4 in. (50 6.3 Masking Tape, to secure the panel to a flat surface.
to 100 mm) in width.
7. Procedure
1.3 This standard does not purport to address the safety
7.1 All tests are to be conducted in an atmosphere having a
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and temperature of 23 6 2°C (73.5 6 3.5°F) and a relative
humidity of 50 6 5 % (see Specification D 3924).
health practices and determine the applicability of regulatory
limitations prior to use. 7.2 Record weight of the test brush before loading (W1)
using the example format as a guide (see Table 1). Place brush
2. Referenced Documents
out panel on scale and tare.
2.1 ASTM Standards: 7.3 Dip the brush into the specified paint to the following
D 3924 Specification for Standard Environment for Condi- depth:
tioning and Testing Paint, Varnish, Lacquers, and Related
Brush Width, in. (mm) Filament Depth, in. (mm)
2 1 1
2 and 2 ⁄2 (50 and 62.5) 1 ⁄2 (38)
Materials
1 3
3 and 3 ⁄2 (75 and 87.5) 1 ⁄4 (45)
D 5301 Practice for Physical Characterization of Paint
4 (100 ) 2 (50)
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Brushes
NOTE 1—It is very important to assure that the depth that the brush
filaments are dipped into the paint is consistent from brushout to brushout.
3. Summary of Practice
To aid in determining the depth to dip the filaments, a tongue depressor or
3.1 Using a paint chosen for the evaluation, the brush to be
other guide for the specified length can be taped to the brush ferrule.
tested is repeatedly loaded with this paint and brushed over a
7.4 Hold the brush at the specified depth in the paint for
specified area in a specified application time.
10 s. Remove and hold the brush vertically for 30 s allowing
any excess paint to drain back into the paint can.
4. Significance and Use
7.5 Secure the brush-out panel with masking tape to a flat,
4.1 Until the paint brush is fully conditioned and wetted
smooth, horizontal surface.
with paint, only part of the paint loaded onto the brush can be
7.6 After the drain period, immediately place brush on a
transferred to the surface being painted. By properly preparing
tared brush-out panel and weigh. Record the brush weight
the brush before use, the amount of paint delivered to the
loaded with paint (W2). Record the amount of paint picked up
surface can be made more uniform and reflect real use.
by the brush as A, where A = W2−W1. Apply paint to the
specified initial area on the brush-out panel as indicated below:
5. Apparatus
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Brush Width, in. (mm) Initial Area, (cm )
5.1 Container, to hold paint, for example, a quart can.
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2 and 2 ⁄2 (50 and 62.5) 250
5.2 Test Brush, 2 to 4 in. (50 to 100 mm) in width.
3 and 4 (75 and 100) 500
5.3 Balance, to weigh brush to the nearest 0.1 gram.
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7.7 Application time shall be 15 s for 2 to 2 ⁄2 in. (50 to
62.5-mm) brushes or 20 s for the 3 to 4 in. (75 to 100-mm)
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brushes.
This practice is under the jurisdiction of ASTM Committee D01 on Paint and
Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.61 on Paint Application Tools.
Current edition approved Feb. 10, 2002. Published April 2002. Originally
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published as D 5068 – 90. Last previous edition D 5068 – 92 (1997). Any smooth type panel can be used. A Leneta 8H-BW Chart, available from
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Annual Book of ASTM Standards, Vol 06.01. The Leneta Co., 15 Whitney Road, Mahaw, N.J. 07430 has been used in round robin
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Annual Book of ASTM Standards, Vol 06.02. testing for this purpose.
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D 5068
TABLE 1 Example Calculation
Initial Break-In Break-In Break-In Break-In Break-In
Break-In 1 2 3 4 5
Brush Weight before Loading W1 65.5 73.1 75.4
Brush Weight Loaded w/Paint W2 74.7 77.4 79.0
Net Paint Weight Pick Up A 9.3 4.3 3.6
Brush Weight after Painting W3 73.1 75.4 77.2
Net Paint Discharged B 1.6 2.0 1.8
Cum Paint Weight Pick Up C 9.3 11.9 13.5
Difference in Pick Up D 9.3 2.7 1.6
% Additional Pick Up versus Time P 100.0 22.4 11.8
FIG. 1 Paint Applicat
...