ASTM D7072-04
(Practice)Standard Practice for Evaluating Accelerated Efflorescence of Latex Coatings
Standard Practice for Evaluating Accelerated Efflorescence of Latex Coatings
SCOPE
1.1 This practice covers the evaluation of the degree to which a latex paint resists the formation of efflorescence and alkali burnout on the exposed paint surface.
1.2 This practice is designed primarily to relate efflorescence originating in the substrate to the deposit appearing on the surface of latex paints. This practice relates chiefly to the painting of masonry-type substrates such as concrete block, brick, mortar, stucco, poured concrete and similar materials.
1.3 The values in SI units are to be regarded as the standard. The values in parenthesis are for information only.
1.4 This method does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of whoever uses this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:D7072–04
Standard Practice for
Evaluating Accelerated Efflorescence of Latex Coatings
This standard is issued under the fixed designation D7072; 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 colored, nonuniform, powdery incrustation which detracts
from the paint film appearance. The discoloration occurs when
1.1 This practice covers the evaluation of the degree to
soluble salts in the substrate or paint migrate to the surface by
which a latex paint resists the formation of efflorescence and
the leaching and evaporating action of the water carrier. The
alkali burnout on the exposed paint surface.
efflorescence originating within the substrate is that with which
1.2 This practice is designed primarily to relate efflores-
this method is concerned.
cence originating in the substrate to the deposit appearing on
3.1.2 alkali burnout, n—the premature fading or decompo-
the surface of latex paints. This practice relates chiefly to the
sitionofpaintsthataresensitivetothehighpHofthesubstrate.
painting of masonry-type substrates such as concrete block,
The high alkaline content of the substrate can alter the color.
brick, mortar, stucco, poured concrete and similar materials.
1.3 The values in SI units are to be regarded as the standard.
4. Summary of Practice
The values in parenthesis are for information only.
4.1 Panels known to have a level of salts capable of being
1.4 This method does not purport to address all of the safety
easily and quickly transported to the paint surface are used.
concerns, if any, associated with its use. It is the responsibility
Since tinted paints show the efflorescence most clearly, all
of whoever uses this standard to consult and establish appro-
white paints should be tinted before application. The panel is
priate safety and health practices and determine the applica-
placed face down over the surface of the test chamber which
bility of regulatory limitations prior to use.
contains heated water, so that moisture condenses and remains
2. Referenced Documents on the painted surface of the panel for a period of 48 h. After
drying at ambient conditions, the panels are rated for the
2.1 ASTM Standards:
degree of efflorescence which has formed.
D1475 Test Method For Density of Liquid Coatings, Inks,
and Related Products
5. Significance and Use
D1734 Practice for Making Cementitious Panels forTesting
5.1 Latex paints are sometimes applied over substrates that
Coatings
contain a high level of water soluble salts that result in
D4585 Practice for Testing Water Resistance of Coatings
efflorescence. This practice evaluates a coating’s vulnerability
Using Controlled Condensation
to efflorescence.
D5068 Practice for Preparation of Paint Brushes for Evalu-
ation
6. Apparatus
3. Terminology Terminology (Specific to this Practice) 6.1 Condensation Test Chamber—As described in Practice
D4585.
3.1 Definitions of Terms Specific to This Standard:
6.2 Test Substrate—Fiber-cement siding or a substrate
3.1.1 efflorescence, n—the deposition of soluble salts on the
agreed upon by the purchaser and seller. The substrate size
exposed paint surface. Efflorescence is characterized by a light
would depend on the number of test paints.
6.3 White Portland Cement and Graded Standard Sand (as
This practice is under the jurisdiction of Committee D01 on Paint and Related
described in Practice D1734).
Coatings, Materials, and Applications and is the direct responsibility of Subcom-
6.4 Trowel (as described in Practice D1734).
mittee D01.42 on Architectural Coatings.
6.5 Paint Brush—Nylon/polyester brush of good quality.
Current edition approved on July 1, 2004. Published August 2004. DOI:
10.1520/D7072-04.
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
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D7072–04
6.6 Electronic Scale capable of 0.1 g.
A = area, square
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