1、Designation:D753910(Reapproved 2020)Standard Practice forUsing a Test Chamber for Humidity Conditioning of TestPanels of Pavement Marking Paints1This standard is issued under the fixed designation D7539;the number immediately following the designation indicates the year oforiginal adoption or,in the
2、 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 Specification D3924 defines a standard environment of23 6 2C and 50 6 5%relative humidity and
3、 free from draftsfor normal conditioning and testing of paint,varnish,lacquer,and related materials.This practice describes a test chamberthat allows for control of relative humidity above the ambientrelative humidity and minimization of air flow for conditioningof test panels at elevated relative h
4、umidity and room tempera-tures.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 This standard does not purport to address all of th
5、esafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-danc
6、e with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standard
7、s:2D711 Test Method for No-Pick-Up Time of Traffic PaintD1640 Test Methods for Drying,Curing,or Film Formationof Organic CoatingsD3924 Specification for Standard Environment for Condi-tioning and Testing Paint,Varnish,Lacquer,and RelatedMaterialsD7377 Practice for Evaluating the Water Wash-Off Resis
8、-tance of Traffic Paints using a Water FaucetD7538 Practice for Evaluating the Water Wash-Off Resis-tance of Traffic Paints Using an Atomizing Spray Device2.2 Other Standard:3TT-P-1952E Federal Specification for Paint,Traffic andAirfield Marking,Waterborne(10 July 2007)3.Terminology3.1 Definitions:3
9、.1.1 test chamber,na cabinet or box,preferably made oftransparent,waterproof material,such as clear acrylic plastic,with panel supports and holes(ports)that can be partially tofully opened to mix outside ambient air with humidified air inthe chamber or some other means to provide humidified airwith
10、minimal air flow.3.1.1.1 DiscussionAlso commonly referred to as a humid-ity box or humidity chamber,as in Federal SpecificationTT-P-1952E.3.1.2 waterborne pavement marking(traffc)paint,nanaqueous paint used for marking pavements.4.Summary of Practice4.1 Atest chamber is described that allows for the
11、 control ofrelative humidity above ambient relative humidity and theminimization of air flow variability at ambient room tempera-tures.5.Significance and Use5.1 The drying rate of organic coatings varies with changesin temperature,air flow,and relative humidity.In particular,thedrying rate of waterb
12、orne paints depends on the evaporation ofwater and thus is much more dependent on relative humiditythan are solvent based paints or paints that are 100%solids.Measurement of the rate of drying of waterborne paints underambient conditions in laboratories cannot be adequately repli-cated without some
13、control of the drying conditions.A testchamber will be described that provides a means of controlling1This 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.Curre
14、nt edition approved June 1,2020.Published July 2020.Originally approvedin 2010.Last previous edition approved in 2015 as D7539 10(2015).DOI:10.1520/D7539-10R20.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of AST
15、MStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from General Services Administration,Federal Supply Service,Specification Section,Suite 8100,470 LEnfant Plaza,SW,Washington DC 20407,http:/www.gsa.gov.Copyright ASTM International,100 Barr Harbo
16、r Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.relative humidity above ambient humidity and minimizing theeffects of air flow variability at ambient room temperatures.I
