ASTM D7539-10(2020)

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: D7539 − 10 (Reapproved 2020)
Standard Practice for
Using a Test Chamber for Humidity Conditioning of Test
Panels of Pavement Marking Paints
This standard is issued under the fixed designation D7539; 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 D7377 Practice for Evaluating the Water Wash-Off Resis-
tance of Traffic Paints using a Water Faucet
1.1 Specification D3924 defines a standard environment of
D7538 Practice for Evaluating the Water Wash-Off Resis-
23 6 2°C and 50 6 5 % relative humidity and free from drafts
tance of Traffic Paints Using an Atomizing Spray Device
for normal conditioning and testing of paint, varnish, lacquer,
2.2 Other Standard:
and related materials. This practice describes a test chamber
TT-P-1952E Federal Specification for Paint, Traffic and
that allows for control of relative humidity above the ambient
Airfield Marking, Waterborne (10 July 2007)
relative humidity and minimization of air flow for conditioning
of test panels at elevated relative humidity and room tempera-
3. Terminology
tures.
3.1 Definitions:
1.2 The values stated in inch-pound units are to be regarded
3.1.1 test chamber, n—a cabinet or box, preferably made of
as standard. The values given in parentheses are mathematical
transparent, waterproof material, such as clear acrylic plastic,
conversions to SI units that are provided for information only
with panel supports and holes (ports) that can be partially to
and are not considered standard.
fully opened to mix outside ambient air with humidified air in
1.3 This standard does not purport to address all of the
the chamber or some other means to provide humidified air
safety concerns, if any, associated with its use. It is the
with minimal air flow.
responsibility of the user of this standard to establish appro-
3.1.1.1 Discussion—Also commonly referred to as a humid-
priate safety, health, and environmental practices and deter-
ity box or humidity chamber, as in Federal Specification
mine the applicability of regulatory limitations prior to use.
TT-P-1952E.
1.4 This international standard was developed in accor-
3.1.2 waterborne pavement marking (traffıc) paint, n—an
dance with internationally recognized principles on standard-
aqueous paint used for marking pavements.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
4. Summary of Practice
mendations issued by the World Trade Organization Technical
4.1 Atest chamber is described that allows for the control of
Barriers to Trade (TBT) Committee.
relative humidity above ambient relative humidity and the
2. Referenced Documents
minimization of air flow variability at ambient room tempera-
tures.
2.1 ASTM Standards:
D711 Test Method for No-Pick-Up Time of Traffic Paint
5. Significance and Use
D1640 Test Methods for Drying, Curing, or Film Formation
5.1 The drying rate of organic coatings varies with changes
of Organic Coatings
intemperature,airflow,andrelativehumidity.Inparticular,the
D3924 Specification for Standard Environment for Condi-
drying rate of waterborne paints depends on the evaporation of
tioning and Testing Paint, Varnish, Lacquer, and Related
water and thus is much more dependent on relative humidity
Materials
than are solvent based paints or paints that are 100 % solids.
Measurement of the rate of drying of waterborne paints under
This practice is under the jurisdiction of ASTM Committee D01 on Paint and
Related Coatings, Materials, and Applications and is the direct responsibility of
ambient conditions in laboratories cannot be adequately repli-
Subcommittee D01.44 on Traffic Coatings.
cated without some control of the drying conditions. A test
CurrenteditionapprovedJune1,2020.PublishedJuly2020.Originallyapproved
chamber will be described that provides a means of controlling
in 2010. Last previous edition approved in 2015 as D7539 – 10 (2015). DOI:
10.1520/D7539-10R20.
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 Available from General Services Administration, Federal Supply Service,
Standards volume information, refer to the standard‘s Document Summary page on Specification Section, Suite 8100, 470 L’Enfant Plaza, SW, Washington DC 20407,
the ASTM website. http://www.gsa.gov.
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D7539 − 10 (2020)
relative humidity above ambient humidity and minimizing the 8.1.3 Establish the desired relative humidity by opening and
effects of air flow variability at ambient room temperatures. If closing the ports on the sides of the chamber, preferably so that
desired, the test chamber without water in it and with vents the size of the port openings are about the same on both sides
wide open can be placed in a temperature and humidity of the chamber to equalize the air circulation in the chamber.
controlled room to test dry speed at various temperatures as Therelativehumidityinthetestchamberwillstabilizeoncethe
well as humidity while using the chamber to minimize the port openings are established. Occasional slight adjustments in
effect of air flow. the side port openings may be required if the ambient humidity
in the room changes significantly during testing.
5.2 This practice is particularly useful for testing the drying
8.1.4 Target test relative humidity must be above the ambi-
rate of waterborne pavement marking (traffic) paints where fast
ent humidity in the room. It is best to use the chamber in a
dry at elevated ambient humidity is an important feature. For
conditioned room at a controlled temperature (23 6 2°C) and
waterborne traffic paints, the test chamber can be used to
humidity (50 6 5 % relative humidity) as described in Speci-
evaluate dry to no-pick-up (Test Method D711) and water
fication D3924.
wash-off resistance (Practices D7377 and D7538) at elevated
ambient humidity.
8.2 Cali
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