Standard Test Method for Burnish Resistance of Latex Paints

SIGNIFICANCE AND USE
Interior flat paints may become burnished in areas where clothing or upholstered furniture rub against a wall. This rubbing may cause a smoother, glossier surface at the contacted area, depending on the level or type of pigments in the paint and binder hardness. This method permits a more quantitative estimate of burnish resistance than those using manual rubbing techniques.
SCOPE
1.1 This test method covers a procedure for measuring the resistance of latex paints to burnishing under dry conditions.
1.2 This standard does not purport to address all of the safety concerns, 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.

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Publication Date
09-Dec-2001
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ASTM D6736-01 - Standard Test Method for Burnish Resistance of Latex Paints
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D6736–01
Standard Test Method for
Burnish Resistance of Latex Paints
This standard is issued under the fixed designation D 6736; 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 5. Significance and Use
1.1 This test method covers a procedure for measuring the 5.1 Interiorflatpaintsmaybecomeburnishedinareaswhere
resistance of latex paints to burnishing under dry conditions. clothing or upholstered furniture rub against a wall. This
1.2 This standard does not purport to address all of the rubbingmaycauseasmoother,glossiersurfaceatthecontacted
safety concerns, if any, associated with its use. It is the area, depending on the level or type of pigments in the paint
responsibility of the user of this standard to establish appro- and binder hardness. This method permits a more quantitative
priate safety and health practices and determine the applica- estimate of burnish resistance than those using manual rubbing
bility of regulatory limitations prior to use. techniques.
2. Referenced Documents 6. Apparatus
2.1 ASTM Standards: 6.1 Constant temperature/humidity room 23 6 2°C (73.5 6
D 523 Test Method for Specular Gloss 3.5°F); 50 6 5 % relative humidity (standard conditions,
D 2486 Test Methods for Scrub Resistance of Wall Paints Specification D 3924).
D 3924 Specification for Standard Environment for Condi- 6.2 Washability Machine (Scrub Machine),describedinTest
tioning and Testing Paint, Varnish, Lacquer, and Related Methods D 2486.
Materials 6.2.1 Accessory Apparatus:
6.2.1.1 Sandpaper Attachment, total weight 454 g.
3. Terminology
6.2.1.2 Glass Plate, measured to fit.
3.1 Definition: 6.2.1.3 Gasket Frame and Clamps.
3.1.1 burnish resistance—the ability of a coating to resist an
6.3 Large Vacuum Plate.
increase in its gloss (sheen) value after polishing or rubbing. 6.4 Film Caster, having a 0.18-mm (7.0-mil) clearance.
6.5 Glossmeter(s), capable of measuring 60° and 85° gloss
4. Summary of Test Method
in accordance with Test Method D 523.
4.1 Test paints are drawn down lengthwise on plastic panels
7. Materials
using a 0.18-mm (7.0-mil) applicator and allowed to air-dry for
one week. Gloss readings are taken at three equally spaced
7.1 Plastic Scrub Panels,43.5mm 316.5mm(17in. 36.5
points, lengthwise along the center of the panel. The panel is in.), white or black.
thenrubbedfor20cyclesonascrubmachine,afterwhichgloss
7.2 Cheesecloth, 4-ply, medium weave.
readings are again taken along the same path abraded by the
8. Procedure
scrub machine. The initial values are averaged and the final
values are averaged. The difference between the initial and 8.1 Application and Evaluation of Test Paints:
final gloss readings, divided by the initial reading times 100 is 8.1.1 Attach a plastic panel to the vacuum plate and draw
a quantitative indication of the paint’s resistance to burnishing. down the test paint uniformly lengthwise, using the 0.18-mm
Higher percentage increases denote poorer resistance and (7.0-mil) side of the applicator.
vice-versa. 8.1.2 Condition the panels for one week in the constant
temperature / humidity room or under other conditions agreed
upon between the buyer and seller.
8.1.3 Take three equally spaced gloss readings (Test Method
This test method is under the jurisdiction of ASTM Committee D01 on Paint
D 523) along the center length of the panel, making sure the
and Related Coatings
...

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