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ASTM

ASTM D6900-10(2020)

(Test Method)

Standard Test Method for Wet Adhesion of Latex Paints to a Gloss Alkyd Enamel Substrate

Standard Test Method for Wet Adhesion of Latex Paints to a Gloss Alkyd Enamel Substrate

SIGNIFICANCE AND USE
5.1 After application to either interior or exterior surfaces, latex paints may be subjected to conditions of high humidity, condensation, or precipitation. This may sometimes lead to a loss of adhesion to the substrate over which they have been applied. This method is a quantitative measure of the adhesion of latex paints to glossy substrates under such conditions.
SCOPE
1.1 This test method covers a procedure for measuring by scrubbing the adhesion of latex paints to glossy alkyd enamel substrates after exposure to wet conditions.  
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 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.

General Information

Status
Published
Publication Date
30-Nov-2020
ICS
87.040 - Paints and varnishes
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.42 - Architectural Coatings
Current Stage
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ASTM D6900-10(2020) - Standard Test Method for Wet Adhesion of Latex Paints to a Gloss Alkyd Enamel SubstrateASTM D6900-10(2020) - Standard Test Method for Wet Adhesion of Latex Paints to a Gloss Alkyd Enamel Substrate
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ASTM D6900-10(2020) - Standard Test Method for Wet Adhesion of Latex Paints to a Gloss Alkyd Enamel Substrate
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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: D6900 − 10 (Reapproved 2020)
Standard Test Method for
Wet Adhesion of Latex Paints to a Gloss Alkyd Enamel
1
Substrate
This standard is issued under the fixed designation D6900; 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 3. Terminology
1.1 This test method covers a procedure for measuring by 3.1 Definitions of Terms Specific to This Standard:
scrubbing the adhesion of latex paints to glossy alkyd enamel
3.1.1 wet adhesion, n—the ability of a coating to resist
substrates after exposure to wet conditions.
removal by scrubbing from the surface beneath it after expo-
sure to wet conditions and abrasion.
1.2 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
4. Summary of Test Method
only.
4.1 Test paints, with optional control paint, are drawn down
1.3 This standard does not purport to address all of the
2
using a 7-mil clearance Dow applicator (~11 m /L) across a
safety concerns, if any, associated with its use. It is the
cured alkyd gloss enamel previously drawn down on a black or
responsibility of the user of this standard to establish appro-
white plastic panel.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
4.2 The drawdown films are allowed to dry under standard-
1.4 This international standard was developed in accor-
izedconditions.Then,eighteencutsaremadetoforma6by10
dance with internationally recognized principles on standard-
cut block, creating sixty 6.4 mm (0.25 in) squares, in the center
ization established in the Decision on Principles for the
of each film with a razor blade.
Development of International Standards, Guides and Recom-
4.3 The panels are then soaked for 30 min in ambient tap
mendations issued by the World Trade Organization Technical
water. The panel is mounted in a washability tester and 20 mL
Barriers to Trade (TBT) Committee.
of water are applied. The panel is then scrubbed for up to 500
cycles or until all of the squares within each block are
2. Referenced Documents
2 completely removed.
2.1 ASTM Standards:
D523 Test Method for Specular Gloss
5. Significance and Use
D714 Test Method for Evaluating Degree of Blistering of
Paints
5.1 After application to either interior or exterior surfaces,
D2486 Test Methods for Scrub Resistance of Wall Paints
latex paints may be subjected to conditions of high humidity,
D3924 Specification for Standard Environment for Condi- condensation, or precipitation. This may sometimes lead to a
tioning and Testing Paint, Varnish, Lacquer, and Related
loss of adhesion to the substrate over which they have been
Materials applied. This method is a quantitative measure of the adhesion
E691 Practice for Conducting an Interlaboratory Study to
of latex paints to glossy substrates under such conditions.
Determine the Precision of a Test Method
E177 Practice for Use of the Terms Precision and Bias in
6. Apparatus
ASTM Test Methods
6.1 Constanttemperature/humidityroominaccordancewith
Specification D3924 [23 6 2°C (73.5 6 3.5°F) and 50 65%
1 relative humidity].
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
6.2 Drawdown Plate.
Subcommittee D01.42 on Architectural Coatings.
Current edition approved Dec. 1, 2020. Published December 2020. Originally
6.3 Straight Line Washability Tester and Accessories, per
approved in 2003. Last previous edition approved in 2015 as D6900 – 10 (2015).
Test Methods D2486.
DOI:10.1520/D6900-10R20.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.4 Nylon Bristle Brush and Accessories (nominal weight
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
455 g), having nylon brush bristles in 5/4 pattern extending 19
Standards volume information, refer to the standard’s Document Summary page on
3
the ASTM website. mm ( ⁄4 in.) from block (as per Test Methods D2486).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D6900 − 10 (2020)
6.5 Dow FilmApplicator,having7-mil(0.18-mm)clearance 8.2.2 Condition the panels for one week in the constant
by 5.2-in. (132-mm) width. applicator blade. temperature/humidity room as specified in Specification
...

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