ASTM D7377-09(2013)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D7377 − 09 (Reapproved 2013)
Standard Practice for
Evaluating the Water Wash-Off Resistance of Traffic Paints
using a Water Faucet
This standard is issued under the fixed designation D7377; 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 D4414 Practice for Measurement of Wet Film Thickness by
Notch Gages
1.1 Atrafficpaintfilmfreshlyappliedtoaroadway,airstrip,
or parking lot may be exposed to rain of varying intensities
3. Terminology
shortly after application. This practice was designed to deter-
mine the relative water wash-off resistance of an applied traffic 3.1 Definitions:
paint film under controlled laboratory conditions using a water
3.1.1 conventional waterborne traffıc paint, n—an aqueous
faucet to simulate a heavy rain. This laboratory practice can
traffic paint that uses a conventional (non-fast-dry) latex
also be used to compare conventional and fast-dry waterborne
binder.
traffic paints and the effects of binders and other components in
3.1.1.1 Discussion—Typical no-pick-up dry times for con-
traffic for their relative ability to withstand a heavy rain soon
ventional traffic paints by Test Method D711 are 20 to 45 min.
after application.
These paints are often used for zone marking of parking lots
and garages.
1.2 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
3.1.2 durable fast-dry waterborne traffıc paint, n—an aque-
only.
ous traffic paint that uses a durable fast-dry latex binder.
1.3 This standard does not purport to address all of the
3.1.2.1 Discussion—Air or airless spray application on
safety concerns, if any, associated with its use. It is the
roadways is typically 0.65 mm (25 mils) wet or about 0.41 mm
responsibility of the user of this standard to establish appro-
(16 mils) dry. The range of application for durable waterborne
priate safety and health practices and determine the applica-
paints is 0.56 to 0.89 mm (22 to 35 mils) wet, but sometimes
bility of regulatory limitations prior to use.
durable paints are striped at standard line thickness. Typical
no-pick-up dry times by Test Method D711 for durable paints
2. Referenced Documents
applied at standard line thickness are 5 to 8 min.
2.1 ASTM Standards:
3.1.3 effective water wash-off dry time, n—the traffic paint
D562 Test Method for Consistency of Paints Measuring
dry time required for no visible loss of coating when conduct-
KrebsUnit(KU)ViscosityUsingaStormer-TypeViscom-
ing the water wash-off Standard Practice.
eter
3.1.4 fast-dry waterborne traffıc paint, n—an aqueous traffic
D711 Test Method for No-Pick-Up Time of Traffic Paint
paint that uses a fast-dry traffic latex binder.
D823 Practices for Producing Films of Uniform Thickness
3.1.4.1 Discussion—These paints are sometimes also re-
of Paint, Varnish, and Related Products on Test Panels
ferred to as fast-hardening since they still may contain a
D1005 Test Method for Measurement of Dry-Film Thick-
substantial amount of moisture even though they feel dry.
ness of Organic Coatings Using Micrometers
Typical no-pick-up dry times byTest Method D711 for fast-dry
D1212 Test Methods for Measurement of Wet Film Thick-
traffic paints are <10 min.
ness of Organic Coatings
3.1.5 standard line fast-dry waterborne traffıc paint, n—an
aqueous traffic paint that uses a standard fast-dry latex binder.
This practice is under the jurisdiction of ASTM Committee D01 on Paint and
3.1.5.1 Discussion—Air or airless spray application on
Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.44 on Traffic Coatings.
roadways is typically 0.38 mm (15 mils) wet or about .223 mm
Current edition approved Nov. 1, 2013. Published November 2013. Originally
(9 mils) dry. Typical no-pick-up dry times for standard line
approved in 2007. Last previous edition approved in 2009 as D7377 – 09. DOI:
traffic paints by Test Method D711 are 5 to 8 min.
10.1520/D7377-09R13.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3.1.6 waterborne traffıc paint, n—an aqueous traffic paint
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
(usually white or yellow) containing either a conventional or
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. fast-dry latex binder.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D7377 − 09 (2013)
3.1.7 water wash-off resistance, n—the resistance of a traffic 6.13 Lab Jack, to support the applied paint film, and to
paint line to partial or complete wash-out during a rain. control distance from the water nozzle.
6.14 Timer, to time the film-drying and the water wash-off
4. Summary of Practice
periods.
4.1 This standard practice involves preparing a series of
6.15 Camera, to record the image of the panel after comple-
uniform thickness films of traffic paint on standard substrates.
tion of the test.
The films are allowed to dry over different time periods, and
then each paint film is subsequently tested with the water-
7. Reagents
wash-off test to determine the relative amount of coating
7.1 Tap Water (Cold)—applied to the film preferably with a
remaining at the end of the wash off period.
standard nozzle, at controlled flow rate, controlled water
5. Significance and Use
temperature, and constant distance from the test paint films.
5.1 After waterborne traffic paints are applied to a road,
7.2 Acetone—to clean glass plates prior to application (not
airstrip, or parking lot pavement, it is important that the paint
needed for draw-down charts since they are not reused).
films be sufficiently hardened, coalesced, or cured so they will
8. Procedure
not be removed by rain. This practice can be used to determine
the relative performance of binders and other components
8.1 Paint Consistency:
within traffic paint for their effect on the water-wash off
8.1.1 Determine the Krebs (KU) viscosity of the paint in
resistanceofthecoating.Somekeyelementsofthecoatingthat
accordance with Test Method D562 using a paddle-type
mayaffectwater-wash-offperformancearethequalityandtype
viscometer as prescribed by Test Method D562. This determi-
of latex binder, the dry time of the coating (often conducted by
nation is optional but can be important since the dry time of the
Test Method D711), pigment volume concentration (PVC), and
traffic paint and water wash-off performance can be affected by
therelativewatersensitivityofadditives(forexample,pigment
the paint viscosity.
dispersants, and surfactants) in the coating.
8.2 Application of Paint Films:
8.2.1 For most consistent results and for testing under
6. Apparatus and Equipment
controlled conditions, it is recommended that paint film draw-
6.1 Paddle Type Viscometer, to measure viscosity (in Krebs
downs be applied and allowed to dry in a controlled
units) of the traffic paint prior to application.
temperature/controlled
...