ASTM D2486-06

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Designation:D2486–06
Standard Test Methods for
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Scrub Resistance of Wall Paints
This standard is issued under the fixed designation D2486; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope in place on a drawdown plate in a washability machine by
means of a gasketed frame. The coated panel is then scrubbed
1.1 These test methods cover a procedure for determining
with a bristle brush and an abrasive scrub medium until the
the resistance of wall paints to erosion caused by scrubbing,
paint film is removed in one continuous thin line across the
referred to herein after as “scrub resistance.”
shim.
1.2 Two test methods are covered as follows:
3.2 InTestMethodB,thetestpaintandareferencepaintare
1.2.1 Test Method A—Cycles-to-failure obtained on test
applied simultaneously perpendicular to the length of the black
paint.
plastic panel.After curing, the coated panel is placed over two
1.2.2 Test Method B—Ratio expressed as a percentage of
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12.7 by 0.25-mm ( ⁄2-in. by 10-ml) shims that are positioned
cycles-to-failure obtained on the test paint to that obtained on
under each coating. The coatings are then scrubbed with a
a concurrent run with a known reference paint.
bristle brush and an abrasive scrub medium until each paint
1.3 The values stated in SI units are to be regarded as the
film is removed in one continuous thin line across its own
standard. The values given in parentheses are for information
shim.
only.
1.4 This standard does not purport to address all of the
4. Significance and Use
safety concerns, if any, associated with its use. It is the
4.1 Paints often become soiled, especially near doorways,
responsibility of the user of this standard to establish appro-
windows,andinworkandplayareas.Thesetestmethodscover
priate safety and health practices and determine the applica-
thedeterminationoftherelativeresistanceofdifferentpaintsto
bility of regulatory limitations prior to use.
erosion when repeatedly scrubbed during the life of the paint.
2. Referenced Documents 4.2 Test Method D4213 is a similar scrub resistance test
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using a weight-loss technique and reporting volumetric film
2.1 ASTM Standards:
erosion rates.
D3924 Specification for Environment for Conditioning and
4.3 Test Method A measures scrub resistance by the tradi-
Testing Paint, Varnish, Lacquer, and Related Materials
tional cycles-to-failure concept. Poor correlation in scrub
D4213 Test Method for Scrub Resistance of Paints by
testing can be attributable to among other things variations in
Abrasion Weight Loss
the stiffness of the brush bristles, condition of washability
3. Summary of Test Method
tester, application and drying conditions. In an attempt to
improve reproducibility, Test Method B has been developed.
3.1 In Test Method A, the test paint is applied to a black
plastic panel. After curing, the coated panel is placed over a
5. Apparatus
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12.7 wide by 0.25-mm thick ( ⁄2-in. by 10-mil) shim and held
5.1 Straight Line Washability Machine.
5.1.1 Accessory Apparatus: (see Figs. 1 and 2).
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These test methods are under the jurisdiction of ASTM Committee D01 on
5.1.1.1 Nylon Bristle Brush and Accessories,(total weight
Paint and Related Coatings, Materials, and Applications and are the direct
454 6 10 g).
responsibility of Subcommittee D01.42 on Architectural Coatings.
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5.1.1.2 Drawdown Plate, 454 by 165 by 6.3 mm (17 ⁄8 by
Current edition approved April 1, 2006. Published April 2006. Originally
1 1
approved in 1966. Last previous edition approved in 2000 as D2486 – 00. DOI:
6 ⁄2 by ⁄4 in.).
10.1520/D2486-06. 1
5.1.1.3 Brass Shims, 12.7- by 0.25-mm ( ⁄2-in. by 10-mils).
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Its length can be fitted to the width of the drawdown plate.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D2486–06
FIG. 2 Accessory Apparatus for Scrub Test
grams
A
Water, distilled or deionized 49.4
4,6
FIG. 1 Accessory Apparatus for Scrub Test Hydroxyethyl cellulose 0.8
Ammonium hydroxide, 28 % 0.1
4,7
Detergent 2.0
Trisodium phosphate, anhydrous 2.0
4,8
Silica 45.0
5.2 Film Applicator, having 0.18-mm (7-mil) clearance and
B
Acetic acid (glacial) 0.7
1 1
4,9
6.25-mm ( ⁄4-in.) edge and width of 135 mm (5 ⁄4-in.
...