ASTM D4958-97
(Test Method)Standard Test Method for Comparison of the Brush Drag of Latex Paints
Standard Test Method for Comparison of the Brush Drag of Latex Paints
SCOPE
1.1 This test method is a standardized brushout procedure for comparing the brush drag of architectural type latex paints.
1.2 With slight modifications this test method is also applicable to solvent paints.
1.3 This standard does not purport to address all of the safety problems, 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
Relations
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D 4958 – 97
Standard Test Method for
Comparison of the Brush Drag of Latex Paints
This standard is issued under the fixed designation D 4958; 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.
2 2
1. Scope made at a spreading rate of 400 ft /gal (9.82 m /L) and is
completed in 30 to 35 s. The degree of brush drag is rated
1.1 This test method is a standardized brushout procedure
subjectively using a series of standard descriptive terms
for comparing the brush drag of architectural type solvent-
corresponding to numerical values of 1 to 10. The rank order of
borne paints.
a set of samples is thereby established.
1.2 With slight modifications this test method is also appli-
cable to solvent-borne paints.
5. Significance and Use
1.3 This standard does not purport to address all of the
5.1 As the brush drag of a paint increases, any natural
safety concerns, if any, associated with its use. It is the
tendency on the part of the painter to overspread the paint is
responsibility of the user of this standard to establish appro-
reduced. When all other factors are held constant, increased
priate safety and health practices and determine the applica-
brush drag will result in greater film thickness with consequent
bility of regulatory limitations prior to use.
improvement in durability and hiding. Conversely, sometimes
2. Referenced Documents it might be preferred to have a lesser degree of brush drag for
easier application (that is, the amount of time and effort in
2.1 ASTM Standards:
applying a paint to a specific area is reduced with a lesser
D 1475 Test Method for Density of Liquid Coatings, Inks,
degree of brush drag).
and Related Products
5.2 This test method provides a standardized brushout
D 3924 Specification for Standard Environment for Condi-
procedure for the evaluation of brush drag as an alternative to
tioning and Testing Paint, Varnish, Lacquer and Related
customary informal ad hoc procedures. Its objective is to
Materials
maximize the reliability and precision with which this charac-
D 3925 Practice for Sampling Liquid Paints and Related
teristic may be determined.
Pigmented Coatings
D 4287 Test Method for High-Shear Viscosity Using the ICI
NOTE 1—The brush drag of paints is directly related to their high-shear
Cone/Plate Viscometer viscosity. There is generally good rank order agreement between results
obtained by this method and Test Method D 4287. The sensitivity of this
D 5068 Standard Practice for Preparation of Paint Brushes
brushout method has been found sufficient to distinguish between brush-
for Evaluation
abilities corresponding to high-shear viscosity differences not lower than
0.3 poise (0.03 Pa.s). Round robin data show that rank order agreement
3. Terminology
between the brushout and viscometric methods is poor when latex and
3.1 Definitions—See Paint/Coatings Dictionary for defini-
solvent-borne paints are part of the same comparison group. This is the
tion of terms used in this test method.
result of these two paint types having markedly different rheological
3.1.1 brush-drag—resistance encountered when applying a properties that affect the relative perception of brush drag.
coating by brush.
6. Apparatus
4. Summary of Test Method 3
6.1 Brush, 2-in. (50-mm) polyester filament, 2 ⁄4-in. (70-
4.1 A 2-in. (50-mm) polyester brush is used to apply the test mm) length-out, ⁄16 in. (14 mm) thick, with a chiseled tip.
2 2
paint on a 1.076-ft (1000-cm ) test area. The application is
NOTE 2—All tests of a given series of paints, within or between
laboratories, should be carried out with commercially identical brushes.
6.2 Stopwatch.
This test method is under the jurisdiction of ASTM Committee D-1 on Paint
and Related Coatings, Materials, and Applications and is the direct responsibility of
6.3 Balance, capable of weighing accurately to 0.1 g.
Subcommittee D01.42 on Architectural Finishes.
Current edition approved Nov. 10, 1997. Published August 1998. Originally
published as D 4958 – 89. Last previous edition D 4958 – 91.
Annual Book of ASTM Standards, Vol 06.01.
Annual Book of ASTM Standards, Vol 06.02.
4 5
Available from Federation of Societies for Coatings Technology, 492 Norris- Supoporting data are available from ASTM Headquarters. Request RR:
town Rd., Blue Bell, PA 19422. D01–1072.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 4958
6.4 Test charts, with a sealed surface, having 1.076 ft (1000 3—Slight to moderate
2 6
cm ) of test area. 4—Moderate
5—Moderate to considerable
7. Sampling and Conditioning
6—Considerable
7—Considerabl
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.