ASTM_D_7377_-_09_2013.pdf

Designation:D737709(Reapproved 2013)Standard Practice forEvaluating the Water Wash-Off Resistance of Traffic Paintsusing a Water Faucet1This standard is issued under the fixed designation D7377;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 Atraffic paint film freshly applied to a roadway,air strip,or parking lot may be exposed to rain of varying intensitiesshortly after application.This practice was designed to deter-mine the relative water wash-off resistance of an applied trafficpaint film under controlled laboratory conditions using a waterfaucet to simulate a heavy rain.This laboratory practice canalso be used to compare conventional and fast-dry waterbornetraffic paints and the effects of binders and other components intraffic for their relative ability to withstand a heavy rain soonafter application.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D562 Test Method for Consistency of Paints MeasuringKrebs Unit(KU)Viscosity Using a Stormer-Type Viscom-eterD711 Test Method for No-Pick-Up Time of Traffic PaintD823 Practices for Producing Films of Uniform Thicknessof Paint,Varnish,and Related Products on Test PanelsD1005 Test Method for Measurement of Dry-Film Thick-ness of Organic Coatings Using MicrometersD1212 Test Methods for Measurement of Wet Film Thick-ness of Organic CoatingsD4414 Practice for Measurement of Wet Film Thickness byNotch Gages3.Terminology3.1 Definitions:3.1.1 conventional waterborne traffc paint,nan aqueoustraffic paint that uses a conventional(non-fast-dry)latexbinder.3.1.1.1 DiscussionTypical no-pick-up dry times for con-ventional traffic paints by Test Method D711 are 20 to 45 min.These paints are often used for zone marking of parking lotsand garages.3.1.2 durable fast-dry waterborne traffc paint,nan aque-ous traffic paint that uses a durable fast-dry latex binder.3.1.2.1 DiscussionAir or airless spray application onroadways is typically 0.65 mm(25 mils)wet or about 0.41 mm(16 mils)dry.The range of application for durable waterbornepaints is 0.56 to 0.89 mm(22 to 35 mils)wet,but sometimesdurable paints are striped at standard line thickness.Typicalno-pick-up dry times by Test Method D711 for durable paintsapplied at standard line thickness are 5 to 8 min.3.1.3 effective water wash-off dry time,nthe traffic paintdry time required for no visible loss of coating when conduct-ing the water wash-off Standard Practice.3.1.4 fast-dry waterborne traffc paint,nan aqueous trafficpaint that uses a fast-dry traffic latex binder.3.1.4.1 DiscussionThese paints are sometimes also re-ferred to as fast-hardening since they still may contain asubstantial amount of moisture even though they feel dry.Typical no-pick-up dry times by Test Method D711 for fast-drytraffic paints are 10 min.3.1.5 standard line fast-dry waterborne traffc paint,nanaqueous traffic paint that uses a standard fast-dry latex binder.3.1.5.1 DiscussionAir or airless spray application onroadways is typically 0.38 mm(15 mils)wet or about.223 mm(9 mils)dry.Typical no-pick-up dry times for standard linetraffic paints by Test Method D711 are 5 to 8 min.3.1.6 waterborne traffc paint,nan aqueous traffic paint(usually white or yellow)containing either a conventional orfast-dry latex binder.1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.44 on Traffic Coatings.Current edition approved Nov.1,2013.Published November 2013.Originallyapproved in 2007.Last previous edition approved in 2009 as D7377 09.DOI:10.1520/D7377-09R13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.7 water wash-off resistance,nthe resistance of a trafficpaint line to partial or complete wash-out during a rain.4.Summary of Practice4.1 This standard practice involves preparing a series ofuniform thickness films of traffic paint on standard substrates.The films are allowed to dry over different time periods,andthen each paint film is subsequently tested with the water-wash-off test to determine the relative amount