ASTM D2486-06(2012)e1

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
´1
Designation: D2486 − 06 (Reapproved 2012)
Standard Test Methods for
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 U.S. Department of Defense.
ε NOTE—Footnotes in 6.3.1 were editorially updated in February 2012.
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
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.
4. Significance and Use
1.4 This standard does not purport to address all of the
4.1 Paints often become soiled, especially near doorways,
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- windows,andinworkandplayareas.Thesetestmethodscover
thedeterminationoftherelativeresistanceofdifferentpaintsto
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. erosion when repeatedly scrubbed during the life of the paint.
4.2 Test Method D4213 is a similar scrub resistance test
2. Referenced Documents
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
tester, application and drying conditions. In an attempt to
3. Summary of Test Method
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
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).
5.1.1.1 Nylon Bristle Brush and Accessories,(total weight
These test methods are under the jurisdiction of ASTM Committee D01 on
454 6 10 g).
Paint and Related Coatings, Materials, and Applications and are the direct
responsibility of Subcommittee D01.42 on Architectural Coatings.
5.1.1.2 Drawdown Plate, 454 by 165 by 6.3 mm (17 ⁄8 by
Current edition approved Feb. 1, 2012. Published February 2012. Originally
1 1
6 ⁄2 by ⁄4 in.).
approved in 1966. Last previous edition approved in 2006 as D2486 – 06. DOI:
5.1.1.3 Brass Shims, 12.7- by 0.25-mm ( ⁄2-in. by 10-mils).
10.1520/D2486-06R12E01.
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
5.2 Film Applicator, having 0.18-mm (7-mil) clearance and
Standards volume information, refer to the standard’s Document Summary page on
1 1
the ASTM website. 6.25-mm ( ⁄4-in.) edge and width of 135 mm (5 ⁄4-in.).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
´1
D2486 − 06 (2012)
FIG. 2 Accessory Apparatus for Scrub Test
FIG. 1 Accessory Apparatus for Scrub Test
grams
A
Water, distilled or deionized 49.4
4,6
Hydroxyethyl cellulose 0.8
Ammonium hydroxide, 28 % 0.1
4,7
6. Reagents and Materials Detergent 2.0
Trisodium phosphate, anhydrous 2.0
4,8
6.1 Purity of Reagents—Reagent grade chemicals shall be Silica 45.0
B
Acetic acid (glacial) 0.7
used in all tests.
4,9
Preservative 0.03g
3,4
6.2 Black Plastic Panels.
A
Adjust to achieve viscosity of 110 to 120 Krebs units before use.
4,5
B
6.3 Abrasive Scrub Medium. Vary to achieve a pH of 9.5 to 10.
6.3.1 Laboratory standardized abrasive scrub medium con-
6.4 Reference paint when using Test Method B.
sisting of the following:
Cellosize QP-4400H, The Dow Chemical Company, Midland, Michigan, was
Dull black plastic panels, P-121-10N, 165 by 432 by 0.25 mm (6 ⁄2 by 17 in. used in developing the Precision and Bias statement. Other equivalent molecular
by 10 mils) manufactured by The Leneta Co., 15 Whitney Rd., Mahwah, NJ 07430 weight cellulosic thickeners can be used such as Natrosol 250 MR, Ashland
were used in the original development of this standard in order to get the results in Aqualon, Wilmington, Delaware.
these test methods. The sole source of supply of the Triton X-100 detergent known to the
If you are aware of alternative suppliers, please provide this information to committee at this time is The Dow Chemical Company, Midland, Michigan.
ASTM International Headquarters. Your comments will receive careful consider- The sole source of supply of the Imsil 45 known to the committee at this time
ation at a meeting of the responsible technical committee, which you may attend. is Unimin Specialty Minerals Inc., 258 Elm St., New Canaan, CT 06840.
5 9
The sole source of supply of the abrasive scrub medium known to the The preservative package recommended is BIT, 1,2–Benzisothiazol-3(2H)-one.
committee at this time is The Leneta Company. There are several suppliers who offer BIT-based agents.
´1
D2486 − 06 (2012)
7. Preparation of Apparatus uniformly over the brush bristles. Place the brush at one end of
the path. Wet the panel with 5 mL of water in the path of the
7.1 WashabilityMachine—The straight line washability ma-
brush.
chine should be leveled before use and operated at 37 6 1
8.4 Start the test. After each 400 cycles before failure,
cycles per minute.
remove the brush (do not rinse), add 10 g of stirred abrasive
7.2 Brush—Replace the brush when the bristles have be-
scrubmediumandplace5mLofwateronthepathofthebrush
come worn to a point that the bristles extend less than 15 mm
before continuing.
( ⁄8 in.) from the block. Mark the ends of the brush to ensure it
8.5 Record the number of cycles to remove one continuous
is oriented in the same direction for each use.
thin line of paint film across the 12.7-mm ( ⁄2-in.) width of the
7.2.1 Brushes(thatareinfrequentuse)—Brushes that are in
shim. Stop the machine and wipe off the shim area to
frequent use shall be stored in water. Each time before starting
determine, if necessary, if the end point is achieved.
the first test of the day, remove the brush and rinse in water,
then precondi
...