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ASTM D6900-03

(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
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 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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
09-May-2003
ICS
87.040 - Paints and varnishes
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.42 - Architectural Coatings
Current Stage
Ref Project

Relations

Replaced By
ASTM D6900-10 - Standard Test Method for Wet Adhesion of Latex Paints to a Gloss Alkyd Enamel Substrate
Effective Date
01-Feb-2010
Referred By
ASTM D3730-17(2022) - Standard Guide for Testing High-Performance Interior Architectural Wall Coatings
Effective Date
10-May-2003
Referred By
ASTM D5324-16(2022) - Standard Guide for Testing Water-Borne Architectural Coatings
Effective Date
10-May-2003

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ASTM D6900-03 - Standard Test Method for Wet Adhesion of Latex Paints to a Gloss Alkyd Enamel SubstrateASTM D6900-03 - Standard Test Method for Wet Adhesion of Latex Paints to a Gloss Alkyd Enamel Substrate
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ASTM D6900-03 - Standard Test Method for Wet Adhesion of Latex Paints to a Gloss Alkyd Enamel Substrate
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D6900–03
Standard Test Method for
Wet Adhesion of Latex Paints to a Gloss Alkyd Enamel
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 4.2 The drawdown films are allowed to dry under standard-
izedconditions.Then,eighteencutsaremadetoforma6by10
1.1 This method covers a procedure for measuring by
cut block, creating sixty 6.4 mm (0.25 in) squares, in the center
scrubbing the adhesion of latex paints to glossy alkyd enamel
of each film with a razor blade.
substrates after exposure to wet conditions.
4.3 The panels are then soaked for 30 min in ambient tap
1.2 The values stated in SI units are to be regarded as the
water. The panel is mounted in a washability tester and 20 mL
standard. The values given in parentheses are for information
of water are applied. The panel is then scrubbed for up to 500
only.
cycles or until all of the squares within each block are
1.3 This standard does not purport to address all of the
completely removed.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5. Significance and Use
priate safety and health practices and determine the applica-
5.1 After application to either interior or exterior surfaces,
bility of regulatory limitations prior to use.
latex paints may be subjected to conditions of high humidity,
2. Referenced Documents condensation, or precipitation. This may sometimes lead to a
loss of adhesion to the substrate over which they have been
2.1 ASTM Standards:
applied. This method is a quantitative measure of the adhesion
D523 Test Method for Specular Gloss
of latex paints to glossy substrates under such conditions.
D714 Test Method for Evaluating Degree of Blistering of
Paints
6. Apparatus
D2486 Test Methods for Scrub Resistance of Wall Paints
6.1 Constanttemperature/humidityroominaccordancewith
D3924 Specification for Environment for Conditioning and
Specification D3924 [23 6 2°C (73.5 6 3.5°F) and 50 65%
Testing Paint, Varnish, Lacquer, and Related Materials
relative humidity].
3. Terminology 6.2 Drawdown Plate.
6.3 Straight Line Washability Tester and Accessories, per
3.1 Definitions of Terms Specific to This Standard:
Test Methods D2486.
3.1.1 wet adhesion, n—the ability of a coating to resist
6.4 Nylon Bristle Brush and Accessories (nominal weight
removal by scrubbing from the surface beneath it after expo-
455 g), having nylon brush bristles in 5/4 pattern extending 19
sure to wet conditions and abrasion.
mm ( ⁄4 in.) from block (as per Test Methods D2486).
4. Summary of Test Method 6.5 Dow Film Applicator, having 7-mil (0.18-mm) clear-
ance by 5.2-in. (132-mm) width. applicator blade.
4.1 Test paints, with optional control paint, are drawn down
6.6 Single-edge Razor Blade, in safety holder.
using a 7-mil clearance Dow applicator (~11 m /L) across a
6.7 Metal Straight Edge, (or appropriate guide).
cured alkyd gloss enamel previously drawn down on a black or
white plastic panel.
7. Reagents and Materials
7.1 A ready-mix deep-tint alkyd gloss enamel with a 60°
This test method is under the jurisdiction of ASTM Committee D01 on Paint
gloss of at least 65 as measured in accordance with Test
and Related Coatings, Materials, andApplications and is the direct responsibility of
Method D523 (or alkyd as agreed upon by the purchaser and
Subcommittee D01.42 on Architectural Coatings.
Current edition approved May 10, 2003. Published June 2003. DOI: 10.1520/ supplier).
D6900-03.
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
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D6900–03
seller.Shorterconditioningtimesmaybeusedifmorestringent
measures of wet adhesion are needed, as in the case of
determining a coating’s “early” wet adhesion.
NOTE 2—Since humidity and temperature both markedly influence the
rateatwhichpaintdries,aconstanttemperature/humidityroomisstrongly
recommended in order to achieve reproducible results using this method.
8.2.3 Condition, break in and rinse the scrub brush as
specified in Test Methods D2486.
8.2.4 Using a metal straightedge or suitable guide, make
eighteen razor blade cuts, spaced 6.4 mm (0.25 in.) apart
forminga6
...

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