ASTM D7190-10(2011)
(Practice)Standard Practice to Evaluate Leaching of Water-Soluble Materials from Latex Paint Films
Standard Practice to Evaluate Leaching of Water-Soluble Materials from Latex Paint Films
SIGNIFICANCE AND USE
Surfactant staining is a common problem with exterior house paints, particularly when subjected to humid environments (such as morning dew) shortly after application.
Interior paints used in humid areas such as kitchens and bathrooms may also experience surfactant staining.
Leaching of water-soluble materials may be dependent on colorant dispersions that are mixed into tint base paints. Other paint components may also affect the leaching of water-soluble materials.
SCOPE
1.1 This practice covers the ability of a latex paint film to resist staining caused by the leaching of water-soluble materials when contacted with water shortly after application.
1.2 Water staining is attributed to the leaching of surfactants or other water-soluble materials from a paint film.
1.3 The values stated in SI units are to be regarded as standard.
1.4 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 to determine the applicability of regulatory limitations prior to use.
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Designation: D7190 − 10(Reapproved 2011)
Standard Practice to
Evaluate Leaching of Water-Soluble Materials from Latex
Paint Films
This standard is issued under the fixed designation D7190; 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 4.3 Leaching of water-soluble materials may be dependent
on colorant dispersions that are mixed into tint base paints.
1.1 This practice covers the ability of a latex paint film to
Other paint components may also affect the leaching of
resist staining caused by the leaching of water-soluble materi-
water-soluble materials.
als when contacted with water shortly after application.
1.2 Water staining is attributed to the leaching of surfactants
5. Apparatus
or other water-soluble materials from a paint film.
5.1 Film Applicator, suitable to obtain a wet film thickness
1.3 The values stated in SI units are to be regarded as
typically in the range of 125-250 µm (5-10 mils), or as agreed
standard.
upon between manufacturer and supplier.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
6. Materials
responsibility of the user of this standard to establish appro- 3
6.1 Black plastic panels.
priate safety and health practices and to determine the
6.2 Distilled water.
applicability of regulatory limitations prior to use.
6.3 Syringe, 1.0 cc.
2. Referenced Documents
2.1 ASTM Standards:
7. Procedure
D1308 Test Method for Effect of Household Chemicals on
7.1 Apply the test paint along the long dimension of the
Clear and Pigmented Organic Finishes
black plastic panel using the selected film applicator. Allow to
D3924 Specification for Environment for Conditioning and
dry for 4 hours at standard atmospheric conditions of 23 6 2°C
Testing Paint, Varnish, Lacquer, and Related Materials
(73.5 6 3.5ºF) and relative humidity of 50 6 5 % as specified
in Specification D3924. Use the same film thickness when
3. Summary of Practice
comparing a series of latex paint films.
3.1 Water droplets are placed on a paint film that is in its
7.2 Divide the test panel into three sections, labeling them 4
early stages of drying. Stains left behind are evaluated for
Hours, 1 Day, and 4 Days or times agreed upon by the
intensity and how the appearance of the coating has changed.
manufacturer and supplier. (Fig. 1)
4. Significance and Use
7.3 Place a row of four droplets of distilled water at room
4.1 Surfactant staining is a common problem with exterior
temperature across the top of the first designated section of the
house paints, particularly when subjected to humid environ-
test paint. Each droplet shall be approximately 0.1 cc in
ments (such as morning dew) shortly after application.
volume.
4.2 Interior paints used in humid areas such as kitchens and
7.4 Allow the water droplets to stand for 10 minutes. Then
bathrooms may also experience surfactant staining.
lift the panel into a vertical position so the water droplets run
down the sect
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