1、Designation:D662513Standard Practice forConducting a Test of Protective Properties of Polish Appliedto a Painted Panel Using Fluorescent UV-CondensationLight-and Water-Exposure Apparatus1This standard is issued under the fixed designation D6625;the number immediately following the designation indica
2、tes 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 This practice covers the selection of test conditio
3、ns fromPractice G53 to be employed for exposure testing of polish-coated paint,related coatings,and materials.This practicecovers the basic principles and operating procedures for usingfluorescent ultraviolet(UV)and condensation apparatus tosimulate the deterioration caused by sunlight and water as
4、rainor dew.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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 establi
5、sh appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D523 Test Method for Specular GlossG53 Practice for Operating Light-and Water-Exposure Ap-paratus(Fluorescent UV-Condensation Type)for Expo-su
6、re of Nonmetallic Materials(Withdrawn 2000)33.Significance and Use3.1 Organic coatings on exterior exposure are subjected toattack by degrading elements of the weather,particularlyultraviolet light,oxygen,and water.This practice may be usedfor evaluating the protective behavior of polish film applie
7、d toa coating.This polish-coated coating is then exposed in anapparatus that produces ultraviolet radiation,temperaturevariation,and water condensation for a given time period.3.2 No single light exposure apparatus,with or withoutwater,can be specified as a direct simulation of naturalexposure.This
8、practice does not imply a specific correlationwith outdoor exposure.It is,however,useful in screening therelative protective qualities of a polish within the test param-eter.4.Apparatus and Material4.1 Fluorescent UV/Condensation Apparatus,complyingwith Practice G53.4.2 Glossmeter,using an angle of
9、reflection of 60.Theinstrument and the reference standards shall conform to therequirements prescribed in Test Method D523.4.3 Forced-air Oven.4.4 Q Panel,approximately 7.5 by 15 cm aluminum.4.5 Base Paint Coatingshould be a red paint that gives100%loss in gloss after being exposed to the test in th
10、ispractice.Apply this paint to the aluminum Q panel according tothe instructions on the spray can.Allow paint coating to air dryfor 24 h followed by 2 h of drying in a forced-air oven at 50C.4.6 Polishing and Application Cloth shall be the samesize and type for each sample tested.Separate cloths sha
11、ll beused for each polish and for the application step and buffingstep.Materials such as washed cheesecloth,rumple cloth,flannel,cotton diaper cloth,and nonwoven fabrics are suitablefor this purpose.Felt or paper shall not be used.4.7 Samples of Polish,to be tested.5.Procedure5.1 Apply the test poli
12、sh to one half of the prepared coatedpanel.If the polish is a commercially available product,followthe directions on the container so far as is possible.When indoubt of the application method use the following:5.1.1 Apply the polish,allow it to dry to a haze,and thenbuff it with a soft cloth to a gl
13、ossy shine.Equal volumes of testpolishes should be applied when comparing products.Avoidexcessively thin or heavy coats of polish.The temperature and1This practice is under the jurisdiction of ASTM Committee D21 on Polishesand is the direct responsibility of Subcommittee D21.04 on Performance Tests.
14、Current edition approved Oct.1,2013.Published October 2013.Originallyapproved in 2001.Last previous edition approved in 2007 as D6625-01(2007).DOI:10.1520/D6625-13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of
15、 ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 relative
16、 humidity should be measured so that the polish isapplied within 21-27C and 20-80%humidity.The precoatedpanels shall have the same temperature as the surrounding area.5.2 Using a 60 glossmeter,take and record the glossreadings of the polished and unpolished areas of the panel.Also record the gloss differential,which is the gloss reading ofthe polished half of the panel minus the unpolished half.Afterdetermining these initial gloss readings,place the Q panel inthe QUV cabinet.5.3 Use the condensa
