ASTM D7072-04(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: D7072 − 04 (Reapproved 2019)
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 3. Terminology (Specific to This Practice)
1.1 This practice covers the evaluation of the degree to 3.1 Definitions of Terms Specific to This Standard:
which a latex paint resists the formation of efflorescence and 3.1.1 alkali burnout, n—the premature fading or decompo-
alkali burnout on the exposed paint surface. sitionofpaintsthataresensitivetothehighpHofthesubstrate.
The high alkaline content of the substrate can alter the color.
1.2 This practice is designed primarily to relate efflores-
3.1.2 efflorescence, n—the deposition of soluble salts on the
cence originating in the substrate to the deposit appearing on
exposed paint surface. Efflorescence is characterized by a
the surface of latex paints. This practice relates chiefly to the
light-colored, nonuniform, powdery incrustation which de-
painting of masonry-type substrates such as concrete block,
tracts from the paint film appearance. The discoloration occurs
brick, mortar, stucco, poured concrete, and similar materials.
when soluble salts in the substrate or paint migrate to the
1.3 The values in SI units are to be regarded as the standard.
surface by the leaching and evaporating action of the water
The values in parentheses are for information only.
carrier.Theefflorescenceoriginatingwithinthesubstrateisthat
1.4 This standard does not purport to address all of the
with which this method is concerned.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. Summary of Practice
priate safety, health, and environmental practices and deter-
4.1 Panels known to have a level of salts capable of being
mine the applicability of regulatory limitations prior to use.
easily and quickly transported to the paint surface are used.
1.5 This international standard was developed in accor-
Since tinted paints show the efflorescence most clearly, all
dance with internationally recognized principles on standard-
white paints should be tinted before application. The panel is
ization established in the Decision on Principles for the
placed face down over the surface of the test chamber which
Development of International Standards, Guides and Recom-
contains heated water, so that moisture condenses and remains
mendations issued by the World Trade Organization Technical
on the painted surface of the panel for a period of 48 h. After
Barriers to Trade (TBT) Committee.
drying at ambient conditions, the panels are rated for the
degree of efflorescence which has formed.
2. Referenced Documents
2.1 ASTM Standards:
5. Significance and Use
D1475 Test Method for Density of Liquid Coatings, Inks,
5.1 Latex paints are sometimes applied over substrates that
and Related Products
contain a high level of water-soluble salts that results in
D1734 Practice for Making Cementitious Panels for Testing
efflorescence. This practice evaluates a coating’s vulnerability
Coatings
to efflorescence.
D4585 Practice for Testing Water Resistance of Coatings
Using Controlled Condensation
6. Apparatus
D5068 Practice for Preparation of Paint Brushes for Evalu-
6.1 Condensation Test Chamber—As described in Practice
ation
D4585.
6.2 Test Substrate—Fiber-cement siding or a substrate
This practice is under the jurisdiction of Committee D01 on Paint and Related
agreed upon by the purchaser and seller. The substrate size
Coatings, Materials, and Applications and is the direct responsibility of Subcom-
would depend on the number of test paints.
mittee D01.42 on Architectural Coatings.
Current edition approved on April 1, 2019. Published April 2019. Originally
6.3 White Portland Cement and Graded Standard Sand (as
approved in 2004. Last previous edition approved in 2013 as D7072 – 04 (2013).
described in Practice D1734).
DOI: 10.1520/D7072-04R19.
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 Hardieplank, a registered trademark of James Hardie, was found to be
the ASTM website. acceptable but others may be used.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA
...