ASTM D7539-10
(Practice)Standard Practice for Using a Test Chamber for Humidity Conditioning of Test Panels of Pavement Marking Paints
Standard Practice for Using a Test Chamber for Humidity Conditioning of Test Panels of Pavement Marking Paints
SIGNIFICANCE AND USE
The drying rate of organic coatings varies with changes in temperature, air flow, and relative humidity. In particular, the drying rate of waterborne paints depends on the evaporation of water and thus is much more dependent on relative humidity than are solvent based paints or paints that are 100 % solids. Measurement of the rate of drying of waterborne paints under ambient conditions in laboratories cannot be adequately replicated without some control of the drying conditions. A test chamber will be described that provides a means of controlling relative humidity above ambient humidity and minimizing the effects of air flow variability at ambient room temperatures. If desired, the test chamber without water in it and with vents wide open can be placed in a temperature and humidity controlled room to test dry speed at various temperatures as well as humidity while using the chamber to minimize the effect of air flow.
This practice is particularly useful for testing the drying rate of waterborne pavement marking (traffic) paints where fast dry at elevated ambient humidity is an important feature. For waterborne traffic paints, the test chamber can be used to evaluate dry to no-pick-up (Test Method D711) and water wash-off resistance (Practices D7377 and D7538) at elevated ambient humidity.
SCOPE
1.1 Specification D3924 defines a standard environment of 23 ± 2°C and 50 ± 5 % relative humidity and free from drafts for normal conditioning and testing of paint, varnish, lacquer, and related materials. This practice describes a test chamber that allows for control of relative humidity above the ambient relative humidity and minimization of air flow for conditioning of test panels at elevated relative humidity and room temperatures.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.3 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 determine the applicability of regulatory limitations prior to use.
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Standards Content (Sample)
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Designation: D7539 − 10
StandardPractice 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 2.2 Other Standard:
TT-P-1952E Federal Specification for Paint, Traffic and
1.1 Specification D3924 defines a standard environment of
Airfield Marking, Waterborne (10 July 2007)
23 6 2°C and 50 6 5 % relative humidity and free from drafts
for normal conditioning and testing of paint, varnish, lacquer,
3. Terminology
and related materials. This practice describes a test chamber
3.1 Definitions:
that allows for control of relative humidity above the ambient
3.1.1 test chamber, n—a cabinet or box, preferably made of
relative humidity and minimization of air flow for conditioning
transparent, waterproof material, such as clear acrylic plastic,
of test panels at elevated relative humidity and room tempera-
with panel supports and holes (ports) that can be partially to
tures.
fully opened to mix outside ambient air with humidified air in
1.2 The values stated in inch-pound units are to be regarded
the chamber or some other means to provide humidified air
as standard. The values given in parentheses are mathematical
with minimal air flow.
conversions to SI units that are provided for information only
3.1.1.1 Discussion—Also commonly referred to as a humid-
and are not considered standard.
ity box or humidity chamber, as in Federal Specification
1.3 This standard does not purport to address all of the
TT-P-1952E.
safety concerns, if any, associated with its use. It is the
3.1.2 waterborne pavement marking (traffıc) paint, n—an
responsibility of the user of this standard to establish appro-
aqueous paint used for marking pavements.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
4. Summary of Practice
4.1 Atest chamber is described that allows for the control of
2. Referenced Documents
relative humidity above ambient relative humidity and the
2.1 ASTM Standards:
minimization of air flow variability at ambient room tempera-
D711 Test Method for No-Pick-Up Time of Traffic Paint
tures.
D1640 Test Methods for Drying, Curing, or Film Formation
of Organic Coatings at Room Temperature
5. Significance and Use
D3924 Specification for Environment for Conditioning and
5.1 The drying rate of organic coatings varies with changes
Testing Paint, Varnish, Lacquer, and Related Materials
intemperature,airflow,andrelativehumidity.Inparticular,the
D7377 Practice for Evaluating the Water Wash-Off Resis-
drying rate of waterborne paints depends on the evaporation of
tance of Traffic Paints using a Water Faucet
water and thus is much more dependent on relative humidity
D7538 Practice for Evaluating the Water Wash-Off Resis-
than are solvent based paints or paints that are 100 % solids.
tance of Traffic Paints Using an Atomizing Spray Device
Measurement of the rate of drying of waterborne paints under
ambient conditions in laboratories cannot be adequately repli-
cated without some control of the drying conditions. A test
chamber will be described that provides a means of controlling
relative humidity above ambient humidity and minimizing the
This practice is under the jurisdiction of ASTM Committee D01 on Paint and
effects of air flow variability at ambient room temperatures. If
Related Coatings, Materials, and Applications and is the direct responsibility of
desired, the test chamber without water in it and with vents
Subcommittee D01.44 on Traffic Coatings.
wide open can be placed in a temperature and humidity
Current edition approved July 1, 2010. Published July 2010. DOI: 10.1520/
D7539–10.
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
controlled room to test dry speed at various temperatures as 8.1.3 Establish the desired relative humidity by opening and
well as humidity while using the chamber to minimize the closing the ports on the sides of the chamber, preferably so that
effect of air flow. the size of the port openings are about the same on both sides
of the chamber to equalize the air circulation in the chamber.
5.2 This practice is particularly useful for testing the drying
Therelativehumidityinthetestchamberwillstabilizeoncethe
rate of waterborne pavement marking (traffic) paints where fast
port openings are established. Occasional slight adjustments in
dry at elevated ambient humidity is an important feature. For
the side port openings may be required if the ambient humidity
waterborne traffic paints, the test chamber can be used to
in the room changes significantly during testing.
evaluate dry to no-pick-up (Test Method D711) and water
8.1.4 Target test relative humidity must be above the ambi-
wash-off resistance (Practices D7377 and D7538) at elevated
ent humidity in the room. It is best to use the chamber in a
ambient humidity.
conditioned room at a controlled temperature (23 6 2°C) and
humidity (50 6 5 % relative humidity) as described in Speci-
6. Apparatus and Equipment
fication D3924.
6.1 Test Chamber—The required elements of the test cham-
8.2 Calibration and Standardization—When using the test
ber are listed below. (Manufacturing details and a photograph
chamber to determine drying rates, the initial rate test should
of a suitable test c
...
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