1、Designation: D 6625 01 (Reapproved 2007)Standard 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 D 6625; the number immediately followin
2、g 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 (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice cover
3、s the selection of test conditions fromPractice G53to 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 deteriorat
4、ion caused by sunlight and water as rainor dew.1.2 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 regu
5、latory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 523 Test Method for Specular GlossG53 Practice for Operating Light-and Water-Exposure Ap-paratus (Fluorescent UV-Condensation Type) for Exposureof Nonmetallic Materials (Discontinued 2001)33. Significance and Use3.1 Organic
6、 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 applied toa coating. This polish-coated coating is then exposed in anapparatus
7、that produces ultraviolet radiation, temperature, andwater 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 practice does not imply a specific correlationwith outdoor exposure. It is, h
8、owever, useful in screening theprotective quality of a polish within the test parameter.4. Apparatus and Material4.1 Fluorescent UV/Condensation Apparatus, complyingwith Practice G53.4.2 Glossmeter, using an angle of reflection of 60. Theinstrument and the reference standards shall conform to thereq
9、uirements prescribed in Test Method D 523.4.3 Forced-air Oven.4.4 Q Panel, 3 by 6 in. aluminum.4.5 Base Paint Coatingshould be a red paint that gives100 % loss in gloss after being exposed to the test in thispractice. Apply this paint to the 3 by 6 in. aluminum panelaccording to the instructions on
10、the spray can. Allow paintcoating to air dry for 24 h followed by 2 h of drying in aforced-air oven at 50C.4.6 Polishing and Application Cloth shall be the samesize and type for each sample tested. Separate cloths shall beused for each polish and for the application step and buffingstep. Materials s
11、uch 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 polish to one half of the prepared coatedpanel. If the polish is a commercially
12、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 glossy shine. Equal volumes of testpolishes should be applied when compar
13、ing products. Avoidexcessively thin or heavy coats of polish. The temperature andrelative humidity should be measured so that the polish is1This practice is under the jurisdiction of ASTM Committee D21 on Polishesand is the direct responsibility of Subcommittee D21.04 on Performance Tests.Current ed
14、ition approved Feb. 1, 2007. Published March 2007. Originallyapproved in 2001. Last previous edition approved in 2001 as D 6625 - 01.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume infor
15、mation, refer to the standards Document Summary page onthe ASTM website.3Withdrawn.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.applied within 70-80F and 20-80 % humidity. The precoatedpanels shall have the same temperature as the
16、 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, p
17、lace the Q panel inthe QUV cabinet.5.3 Use the condensation mode first, in which there is nolight with moisture at 50C for 4 h.5.4 This is followed by5hofUVexposure, which isfluorescent UV lamp light and no moisture at 70C for 5 h. Thegloss readings are taken as stated in 5.2 after 1, 2, 3, 4 and 5h
18、 of exposure to UV light. Also record a visual observation ofthe exposed, unexposed, and unpolished parts of the Q panelafter the 9 h test. These are 4 separate visual observations of thepainted panel.6. Report6.1 Report the manufacturer and model of the fluorescentUV/condensation apparatus, the man
19、ufacturers designationfor the fluorescent UV lamp, and the relative spectral energydistribution of the lamp.6.2 For each panel, report gloss readings for polished andunpolished areas and gloss differential. Then, for the samepanel, report the same three readings after 1, 2, 3, 4, and5hofUV exposure.
20、7. Precision and Bias7.1 Precision has not yet been established.7.2 This test has no bias because the values produced aredefined only in terms of this practice.8. Keywords8.1 car polish; fluorescent UV/condensation; polish; Q pan-els; UV radiation; waxASTM International takes no position respecting
21、the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard
22、 is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International
23、Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This
24、 standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D 6625 01 (2007)2
