ASTM D7538-09(2013)
(Practice)Standard Practice for Evaluating the Water Wash-Off Resistance of Traffic Paints Using an Atomizing Spray Device
Standard Practice for Evaluating the Water Wash-Off Resistance of Traffic Paints Using an Atomizing Spray Device
SIGNIFICANCE AND USE
5.1 After waterborne traffic paints are applied to a road pavement, it is important that they be sufficiently coalesced or cured so they will not be removed by rain. This practice can be used to determine the relative water wash-off resistance of waterborne traffic paints when exposed to a water spray simulated rain.
SCOPE
1.1 A newly applied traffic paint film may be exposed to rain of varying intensities shortly after application. Practice D7377 describes a practice for evaluating the water wash-off resistance of traffic paints to a hard rain using a steady stream of water from a faucet at a rate of approximately 5.7 L per min. Practice D7538 is a similar practice that describes the use of an adjustable nozzle atomizing spray device to deliver a spray of water that simulates rain rates from approximately 0.05 to 0.5 L per min. This test can be used to compare conventional and fast-dry traffic paints for their relative ability to withstand rain soon after application on roadway surfaces.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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.
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D7538 − 09 (Reapproved 2013)
Standard Practice for
Evaluating the Water Wash-Off Resistance of Traffic Paints
Using an Atomizing Spray Device
This standard is issued under the fixed designation D7538; 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 ness of Organic Coatings
D3924 Specification for Environment for Conditioning and
1.1 Anewlyappliedtrafficpaintfilmmaybeexposedtorain
Testing Paint, Varnish, Lacquer, and Related Materials
of varying intensities shortly after application. Practice D7377
D4414 Practice for Measurement of Wet Film Thickness by
describes a practice for evaluating the water wash-off resis-
Notch Gages
tance of traffic paints to a hard rain using a steady stream of
D7377 Practice for Evaluating the Water Wash-Off Resis-
water from a faucet at a rate of approximately 5.7 L per min.
tance of Traffic Paints using a Water Faucet
Practice D7538 is a similar practice that describes the use of an
adjustable nozzle atomizing spray device to deliver a spray of
3. Terminology
water that simulates rain rates from approximately 0.05 to 0.5
L per min. This test can be used to compare conventional and
3.1 Definitions:
fast-dry traffic paints for their relative ability to withstand rain 3.1.1 conventional waterborne traffıc paint, n—an aqueous
soon after application on roadway surfaces.
traffic paint that uses a conventional-dry latex binder.
3.1.1.1 Discussion—Typical no-pick-up dry times, as pre-
1.2 The values stated in SI units are to be regarded as
scribedinTestMethodD711,forconventionaltrafficpaintsare
standard. No other units of measurement are included in this
20 to 45 min.
standard.
3.1.2 durable fast-dry waterborne traffıc paint, n—an aque-
1.3 This standard does not purport to address all of the
ous traffic paint that uses a third generation durable fast-dry
safety concerns, if any, associated with its use. It is the
latex binder.
responsibility of the user of this standard to establish appro-
3.1.2.1 Discussion—Air or airless spray application on
priate safety and health practices and determine the applica-
roadways is typically 0.64 mm wet or about 0.39 mm dry. The
bility of regulatory limitations prior to use.
range of application for durable waterborne paints is 0.56 to
0.89 mm wet, but sometimes the durable paints are also striped
2. Referenced Documents
2 at standard line thickness.
2.1 ASTM Standards:
3.1.3 fast-dry waterborne traffıc paint, n—an aqueous traffic
D562 Test Method for Consistency of Paints Measuring
paint that uses a fast-dry traffic latex binder.
KrebsUnit(KU)ViscosityUsingaStormer-TypeViscom-
3.1.3.1 Discussion—Typical no-pick-up dry times, as pre-
eter
scribed in Test Method D711, for fast-dry traffic paints are <10
D711 Test Method for No-Pick-Up Time of Traffic Paint
min.
D823 Practices for Producing Films of Uniform Thickness
of Paint, Varnish, and Related Products on Test Panels
3.1.4 standard line fast-dry waterborne traffıc paint, n—an
D1005 Test Method for Measurement of Dry-Film Thick-
aqueous traffic paint that uses a first or second generation
ness of Organic Coatings Using Micrometers
fast-dry latex binder.
D1212 Test Methods for Measurement of Wet Film Thick-
3.1.4.1 Discussion—Air or airless spray application on
roadways is typically 0.38 mm wet or about 0.23 mm dry.
3.1.5 waterborne traffıc paint, n—an aqueous traffic paint
This practice is under the jurisdiction of ASTM Committee D01 on Paint and
Related Coatings, Materials, and Applications and is the direct responsibility of (usually white or yellow) containing either a conventional or
Subcommittee D01.44 on Traffic Coatings.
fast-dry latex binder.
Current edition approved Nov. 1, 2013. Published November 2013. Originally
3.1.6 water wash-off, n—the erosion or removal of freshly
approved in 2009. Last previous edition approved in 2009 as D7538 – 09. DOI:
10.1520/D7538-09R13.
applied traffic paint in the field by rain or in the laboratory
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
using simulated rain.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
3.1.6.1 Discussion—Sometimes referred to as water wash-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. out.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D7538 − 09 (2013)
4. Summary of Practice 8.1.1 Determine the Krebs (KU) viscosity of the paint in
accordance with Test Method D562 using a paddle-type
4.1 This practice involves preparing a series of uniform
viscometer as prescribed by Test Method D562. This determi-
thickness films of traffic paint on standard substrates.The films
nation is optional but can be important since the dry time of the
are allowed to dry over different time periods in a conditioned
traffic paint and water-wash off performance can be affected by
environment, and then each paint film is subsequently sub-
the paint viscosity.
jected to a water spray. Films are wash-off resistant when no
paint is removed by the water spray.
8.2 Calibration of Atomizing Spray Devices:
8.2.1 Partially fill the finger pumped, adjustable nozzle
5. Significance and Use
spray bottle or adjustable nozzle garden-type sprayer with at
5.1 After waterborne traffic paints are applied to a road
least 250 mL of clean tap water and allow to equilibrate to
pavement, it is important that they be sufficiently coalesced or room temperature.
cured so they will not be removed by rain. This practice can be
8.2.2 Adjust the spray nozzle to deliver a 10 to 15 cm
used to determine the relative water wash-off resistance of
diameter spray area from a 15 cm distance.
waterborne traffic paints when exposed to a water spray
8.2.3 For a finger pumped spray device, aim the spray into
simulated rain.
a funnel placed in a
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.