ASTM D6736-08(2019)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D6736 − 08 (Reapproved 2019)
Standard Test Method for
Burnish Resistance of Latex Paints
This standard is issued under the fixed designation D6736; 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.
1. Scope 4. Summary of Test Method
4.1 Test paints are drawn down lengthwise on plastic panels
1.1 This test method covers a procedure for measuring the
using a 0.18-mm (7.0-mil) applicator and allowed to air dry for
resistance of latex paints to burnishing under dry conditions.
one week. Gloss readings are taken at three equally spaced
1.2 The values stated in SI units are to be regarded as the
points, lengthwise along the center of the panel. The panel is
standard. The values given in parentheses are for information
thenrubbedfor20cyclesonascrubmachine,afterwhichgloss
only.
readings are again taken along the same path abraded by the
1.3 This standard does not purport to address all of the
scrub machine. The initial values are averaged and the final
safety concerns, if any, associated with its use. It is the
values are averaged. The difference between the initial and
responsibility of the user of this standard to establish appro-
final gloss readings divided by the initial reading times 100 is
priate safety, health, and environmental practices and deter-
a quantitative indication of the paint’s resistance to burnishing.
mine the applicability of regulatory limitations prior to use.
Higher percentage increases denote poorer resistance and
1.4 This international standard was developed in accor- vice-versa.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
5. Significance and Use
Development of International Standards, Guides and Recom-
5.1 Interiorflatpaintsmaybecomeburnishedinareaswhere
mendations issued by the World Trade Organization Technical
clothing or upholstered furniture rub against a wall. This
Barriers to Trade (TBT) Committee.
rubbingmaycauseasmoother,glossiersurfaceatthecontacted
area, depending on the level or type of pigments in the paint
2. Referenced Documents
and binder hardness. This method permits a more quantitative
2.1 ASTM Standards: estimate of burnish resistance than those using manual rubbing
techniques.
D523 Test Method for Specular Gloss
D2486 Test Methods for Scrub Resistance of Wall Paints
D3924 Specification for Standard Environment for Condi- 6. Apparatus
tioning and Testing Paint, Varnish, Lacquer, and Related
6.1 Constanttemperature/humidityroom23 62 °C(73.5 6
Materials (Withdrawn 2016)
3.5 °F); 50 6 5 % relative humidity (standard conditions,
Specification D3924).
3. Terminology
6.2 Washability Machine (Scrub Machine),describedinTest
3.1 Definitions:
Methods D2486.
3.1.1 burnish resistance, n—the ability of a coating to resist
6.2.1 Accessory Apparatus:
an increase in its gloss (sheen) value after polishing or rubbing.
6.2.1.1 Sandpaper Attachment, total weight 454 g.
6.2.1.2 Glass Plate, measured to fit.
6.2.1.3 Gasket Frame and Clamps.
This test method is under the jurisdiction of ASTM Committee D01 on Paint
6.3 Large Vacuum Plate.
and Related Coatings, Materials, andApplications and is the direct responsibility of
Subcommittee D01.42 on Architectural Coatings.
6.4 Film Caster, having a 0.18-mm (7.0-mil) clearance.
Current edition approved April 1, 2019. Published April 2019. Originally
approved in 2001. Last previous edition approved in 2013 as D6736 – 08 (2013).
6.5 Glossmeter(s), capable of measuring 60° and 85° gloss
DOI: 10.1520/D6736-08R19.
in accordance with Test Method D523.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
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 7. Materials
the ASTM website.
7.1 Plastic Scrub Panels, 43.5 by 16.5 mm (17 by 6.5 in.),
The last approved version of this historical standard is referenced on
www.astm.org. white or black.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D6736 − 08 (2019)
4 5
7.2 Cheesecloth, 4-ply, medium weave. 10. Precision and Bias
10.1 Interlaboratory Experimental Approach:
8. Procedure
10.1.1 The precision of this test method is based on an
interlaboratory study (research report is filed with ASTM) of
8.1 Application and Evaluation of Test Paints:
Test Method D6736. Each of six laboratories tested the burnish
8.1.1 Attach a plastic panel to the vacuum plate and draw
resistance of latex paints. The percentage of gloss increase was
down the test paint uniformly lengthwise, using the 0.18-mm
determined for a total of five different paints, with three
(7.0-mil) side of the applicator.
replicates of the analysis being performed on each sample.
8.1.2 Condition the panels for one week in the constant
Results from the interlaboratory study are summarized in Table
temperature / humidi
...