ASTM D3793-04

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Designation:D3793–04
Standard Test Method for
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Low-Temperature Coalescence of Latex Paint Films
This standard is issued under the fixed designation D 3793; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope sured.Aspecial colored penetrating medium is applied to each,
the excess removed in a specified manner, and reflectances
1.1 This test method covers the determination of the com-
measured again. The difference between the readings on the
parative coalescence of a series of latex paints by determining
stained and unstained films indicates the porosity of that film;
the porosity of films dried at standard and at low temperature.
the difference between the readings for the two temperatures
Porosity is evaluated with a penetrating medium as in Test
indicates the coalescence of that film compared to others in the
Method D 3258.
series.
1.2 The texture of the film, which can affect cleanup, will
influence the results of the test. Stain applied to a high-hiding
4. Significance and Use
paint will not lower the reflectance as much as the same stain
4.1 This test method provides no absolute information,
applied to a low-hiding paint of equal porosity. These points
rather ranking only of the selected series of paints.
must be considered in comparing the different paints.
4.2 This test method can provide a pass-fail situation if
1.3 This method should be used only for comparative
known acceptable and unacceptable paints are included in the
testing within one laboratory, as the numerical results obtained
test.
by different laboratories do not usually agree.
1.4 The values stated in SI units are to be regarded as the
5. Apparatus and Materials
standard. The values given in parentheses are for information
5.1 Plate Glass Panel (base for cardboard panel).
only.
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5.2 Strippable Adhesive.
1.5 This standard does not purport to address all of the
5.3 Test Panel—Smooth porous cardboard pane, such as the
safety concerns, if any, associated with its use. It is the
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back of a white drawdown chart.
responsibility of the user of this standard to establish appro-
5.4 Film Applicator, 150 mm (6 in.) wide with a clearance
priate safety and health practices and determine the applica-
of 150 µm (6 mils).
bility of regulatory limitations prior to use.
NOTE 1—It should be noted that some applicators are marked with the
2. Referenced Documents
nominal wet film thickness, which is one half of the clearance.
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2.1 ASTM Standards:
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5.5 FilmApplicator,140mm(5 ⁄2in.)widewithaclearance
D 3258 Test Method for Porosity of White or Near White 5
of 255 µm (10 mils ).
Paint Films by Staining
5.6 Reflectometer, meeting the requirements ofTest Method
E 1347 Test Method for Color and Color Difference Mea-
E 1347.
surement of Object-Color Specimens by Tristimulus (Fil-
5.7 Cold Cabinet, maintaining 4.5 6 1°C (40 6 2°F ) and
ter) Colorimetry
50 6 5 % relative humidity.
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5.8 Camel’s Hair Brush, approximately 13 mm ( ⁄2 in.)
3. Summary of Test Method
wide.
3.1 The test paints are applied to porous cardboard panels,
5.9 Plastic Wash Bottle, about 500 mL or 16 oz containing
dried at standard temperature and at 4.5°C (40°F ) with 50 %
mineral spirits of the odorless type.
relative humidity in both cases, and their reflectances mea-
5.10 Penetrating Medium—A proprietary composition of
pigments or dye, or both, dispersed in a liquid vehicle.
5.11 Filter Paper.
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This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
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Subcommittee D01.42 on Architectural Coatings. Any strippable adhesive such as represented by the following formulas: vinyl
CurrenteditionapprovedJune1,2004.PublishedJuly2004.Originallyapproved acrylic emulsion (800 parts by weight) and polyethylene glycol, molecular weight
in 1979. Last previous edition approved in 2000 as D 3793 – 00. 1450, (16 parts by weight).
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or White cardboard drawdown chart, FormWA, from the Leneta Co., 15Whitney
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Rd., Mahwah, NJ 07430, was used in the original test method to get the results.
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Standards volume information, refer to the standard’s Document Summary page on The Dow latex film caster from Byk-Gardner, Inc. Gardner Laboratory, 2435
the ASTM website. Linden Lane, Silver Spring, MD 20910, was used originally in this test method.
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