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ASTM D7377-07

(Practice)

Standard Practice for Evaluating the Water Wash-Off Resistance of Traffic Paints

Standard Practice for Evaluating the Water Wash-Off Resistance of Traffic Paints

SIGNIFICANCE AND USE
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 performance of binders and other components within traffic paint for their effect on the water-wash off resistance of the coating. Some key elements of the coating that may affect water-wash-off performance are the quality and type of latex binder, the dry time of the coating (often conducted by Test Method D 711), pigment volume concentration (PVC), and the relative water sensitivity of additives (for example, pigment dispersants, surfactants) in the coating.
SCOPE
1.1 A newly applied traffic paint film may be exposed to hard rain shortly after application. This practice was designed to simulate that condition and covers determination of the water wash-off resistance of an applied traffic paint film under controlled conditions. This test can be used to compare conventional and fast-dry traffic paints and the binders used in them for their relative ability to withstand heavy rain soon after application on roadway surfaces.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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

Status
Historical
Publication Date
30-Jun-2007
ICS
93.080.30 - Road equipment and installations
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.44 - Traffic Coatings
Current Stage
Ref Project

Relations

Replaced By
ASTM D7377-08 - Standard Practice for Evaluating the Water Wash-Off Resistance of Traffic Paints
Effective Date
01-Feb-2008
Referred By
ASTM D7539-10(2020) - Standard Practice for Using a Test Chamber for Humidity Conditioning of Test Panels of Pavement Marking Paints
Effective Date
01-Jul-2007
Referred By
ASTM D2205-20 - Standard Guide for Selection of Tests for Traffic Paints
Effective Date
01-Jul-2007
Referred By
ASTM D7538-09(2018) - Standard Practice for Evaluating the Water Wash-Off Resistance of Traffic Paints Using an Atomizing Spray Device
Effective Date
01-Jul-2007

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ASTM D7377-07 - Standard Practice for Evaluating the Water Wash-Off Resistance of Traffic PaintsASTM D7377-07 - Standard Practice for Evaluating the Water Wash-Off Resistance of Traffic Paints
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ASTM D7377-07 - Standard Practice for Evaluating the Water Wash-Off Resistance of Traffic Paints
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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:D7377–07
Standard Practice for
Evaluating the Water Wash-Off Resistance of Traffic Paints
This standard is issued under the fixed designation D 7377; 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 3. Terminology
1.1 A newly applied traffic paint film may be exposed to 3.1 Definitions:
hard rain shortly after application. This practice was designed 3.1.1 conventional waterborne traffıc paint, n—an aqueous
to simulate that condition and covers determination of the traffic paint that uses a conventional-dry latex binder. Typical
water wash-off resistance of an applied traffic paint film under no-pick-updrytimesforconventionaltrafficpaintsare20to45
controlled conditions. This test can be used to compare min.
conventional and fast-dry traffic paints and the binders used in 3.1.2 durable fast-dry waterborne traffıc paint, n—an aque-
themfortheirrelativeabilitytowithstandheavyrainsoonafter ous traffic paint that uses a third generation durable fast-dry
application on roadway surfaces. latex binder. Air or airless spray application on roadways is
1.2 The values stated in SI units are to be regarded as the typically 0.65 mm (25 mils) wet or about 0.41 mm (16 mils)
standard. The values given in parentheses are for information dry. The range of application for durable waterborne paints is
only. 0.56to0.89mm(22to35mils)wet,butsometimesthedurable
1.3 This standard does not purport to address all of the paints are also striped at standard line thickness.
safety concerns, if any, associated with its use. It is the 3.1.3 effective water wash-off dry time, n—the traffic paint
responsibility of the user of this standard to establish appro- dry time required for no visible loss of coating when conduct-
priate safety and health practices and determine the applica- ing the water-wash off Standard Practice.
bility of regulatory limitations prior to use. 3.1.4 fast-dry waterborne traffıc paint, n—anaqueoustraffic
paintthatusesafast-drytrafficlatexbinder.Typicalno-pick-up
2. Referenced Documents
dry times for fast-dry traffic paints are <10 min.
2.1 ASTM Standards: 3.1.5 standard line fast-dry waterborne traffıc paint, n—an
D 562 Test Method for Consistency of Paints Measuring
aqueous traffic paint that uses a first or second generation
Krebs Unit (KU) Viscosity Using a Stormer-Type Viscom-
fast-dry latex binder. Air or airless spray application on
eter roadways is typically 0.38 mm (15 mils) wet or about .223 mm
D711 Test Method for No-Pick-Up Time of Traffic Paint
(9 mils) dry.
D 823 Practices for Producing Films of Uniform Thickness 3.1.6 waterborne traffıc paint, n—an aqueous traffic paint
of Paint, Varnish, and Related Products on Test Panels
(usually white or yellow) containing either a conventional or
D 1005 Test Method for Measurement of Dry-Film Thick- fast-dry latex binder.
ness of Organic Coatings Using Micrometers
4. Summary of Practice
D 1212 Test Methods for Measurement of Wet Film Thick-
ness of Organic Coatings 4.1 This standard practice involves preparing a series of
D 4414 PracticeforMeasurementofWetFilmThicknessby uniform thickness films of traffic paint on standard substrates.
Notch Gages The films are allowed to dry over different time periods, and
then each paint film is subsequently tested with the water-
wash-off test to determine the relative amount of coating
remaining at the end of the wash off period.
This practice is under the jurisdiction of ASTM Committee D01 on Paint and
Related Coatings, Materials, and Applications and is the direct responsibility of
5. Significance and Use
Subcommittee D01.44 on Traffic Coatings.
Current edition approved July 1, 2007. Published August 2007.
5.1 After waterborne traffic paints are applied to a road
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
pavement, it is important that they be sufficiently coalesced or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
cured so they will not be removed by rain. This practice can be
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. usedtodeterminetherelativeperformanceofbindersandother
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D7377–07
components within traffic paint for their effect on the water- D 823 by making a series of draw-downs with different
wash off resistance of the coating. Some key elements of the applicator gaps and measuring the wet-film thickness of each
coating that may affect water-wash-off performance are the
using Test Method D 1212 or Test Method D 4414. The actual
quality and type of latex binder, the dry time of the coating
wet film thickness is often much lower than the indicated film
(often conducted by Test Method D711), pigment volume
applicatorgap,forexample,a25milgapmayproducea15mil
concentration (PVC), and the relative water sensitivity of
wet film thickness. Dry film thickness can optionally be
additives (for example, pigment dispersants, surfactants) in the
determined using Test Method D 1005. Clean a series of four
coating.
glass plates with acetone, or optionally use the preferred black
draw-down charts for the film draw-downs. Allow the glass
6. Apparatus and Equipment
platesorchartstoequilibratetoroomtemperature.Acontrolled
6.1 Paddle Type Viscometer, to measure viscosity (in Krebs temperatureandhumidityenvironmentforthedraw-downsand
units) of the traffic paint prior to application. panel drying is recommended. Place about 10 ml of paint on
6.2 Conditioned Room,at23 6 2°C (73.5 6 3.5°F) and 50
the top center of the glass plate or draw-down chart and drag
6 5 % relative humidity for film draw-downs and film drying. the draw-down bar over the paint to produce a coating of
6.3 Humidity, to record relative humidity during the drying
uniform thickness. Immediately start a timer for each film
period.
drawn-down, and allow the films to dry undisturbed for the
6.4 Thermometers, to recor
...

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5.1 After waterborne traffic paints are applied to a road, airstrip, or parking lot pavement, it is important that the paint films be sufficiently hardened, coalesced, or cured so they will not be removed by rain. This practice can be used to determine the relative performance of binders and other components within traffic paint for their effect on the water-wash off resistance of the coating. Some key elements of the coating that may affect water-wash-off performance are the quality and type of latex binder, the dry time of the coating (often conducted by Test Method D711), pigment volume concentration (PVC), and the relative water sensitivity of additives (for example, pigment dispersants, and surfactants) in the coating.
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4.1 Solvents in a traffic paint may cause bleeding of pavement constituents into the traffic marking, thereby rendering the traffic marking less effective as a lane or directional indicator. This practice describes how to prepare a panel of the coating to be tested and a reference panel coated with a specific solvent borne traffic paint to be used as a control for evaluation.  
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5.1 This test method provides a standard procedure for the determination of color of thermoplastic pavement marking materials. This test method can be used in conjunction with various thermoplastic pavement marking specifications to determine compliance of the material to said specification. This method can also be used by manufacturers of these materials to determine the uniformity of thermoplastic pavement marking materials from batch to batch.  
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