1、Designation: D6625 01 (Reapproved 2007)D6625 13Standard 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 fo
2、llowing 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 This practice
3、covers the selection of test conditions from Practice G53 to be employed for exposure testing of polish-coatedpaint, related coatings, and materials. This practice covers the basic principles and operating procedures for using fluorescentultraviolet (UV) and condensation apparatus to simulate the de
4、terioration caused by sunlight and water as rain or dew.1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the r
5、esponsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D523 Test Method for Specular GlossG53 Practice for Operating Light-and Water-Exposure Appar
6、atus (Fluorescent UV-Condensation Type) for Exposure ofNonmetallic Materials (Withdrawn 2000)33. Significance and Use3.1 Organic coatings on exterior exposure are subjected to attack by degrading elements of the weather, particularly ultravioletlight, oxygen, and water. This practice may be used for
7、 evaluating the protective behavior of polish film applied to a coating. Thispolish-coated coating is then exposed in an apparatus that produces ultraviolet radiation, temperature, temperature variation, andwater condensation for a given time period.3.2 No single light exposure apparatus, with or wi
8、thout water, can be specified as a direct simulation of natural exposure. Thispractice does not imply a specific correlation with outdoor exposure. It is, however, useful in screening the relative protectivequalityqualities of a polish within the test parameter.4. Apparatus and Material4.1 Fluoresce
9、nt UV/Condensation Apparatus, complying with Practice G53.4.2 Glossmeter, using an angle of reflection of 60.The instrument and the reference standards shall conform to the requirementsprescribed in Test Method D523.4.3 Forced-air Oven.4.4 Q Panel, 3 by 6 in.approximately 7.5 by 15 cm aluminum.4.5 B
10、ase Paint Coatingshould be a red paint that gives 100 % loss in gloss after being exposed to the test in this practice.Apply this paint to the 3 by 6 in. aluminum aluminum Q panel according to the instructions on the spray can. Allow paint coatingto air dry for 24 h followed by 2 h of drying in a fo
11、rced-air oven at 50C.1 This practice is under the jurisdiction of ASTM Committee D21 on Polishes and is the direct responsibility of Subcommittee D21.04 on Performance Tests.Current edition approved Feb. 1, 2007Oct. 1, 2013. Published March 2007October 2013. Originally approved in 2001. Last previou
12、s edition approved in 20012007 asD6625 - 01.D6625 - 01(2007). DOI: 10.1520/D6625-01R07.10.1520/D6625-13.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards
13、 Document Summary page on the ASTM website.3 The last approved version of this historical standard is referenced on www.astm.org.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Be
14、causeit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100
15、 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14.6 Polishing and Application Cloth shall be the same size and type for each sample tested. Separate cloths shall be used foreach polish and for the application step and buffing step. Materials such as washed cheeseclot
16、h, rumple cloth, flannel, cotton diapercloth, and nonwoven fabrics are suitable for 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 coated panel. If the polish is a commercially available product, fol
17、low thedirections on the container so far as is possible. When in doubt of the application method use the following:5.1.1 Apply the polish, allow it to dry to a haze, and then buff it with a soft cloth to a glossy shine. Equal volumes of test polishesshould be applied when comparing products. Avoid
18、excessively thin or heavy coats of polish. The temperature and relativehumidity should be measured so that the polish is applied within 70-80F21-27C and 20-80 % humidity. The precoated panelsshall have the same temperature as the surrounding area.5.2 Using a 60 glossmeter, take and record the gloss
19、readings of the polished and unpolished areas of the panel. Also recordthe gloss differential, which is the gloss reading of the polished half of the panel minus the unpolished half.After determining theseinitial gloss readings, place the Q panel in the QUV cabinet.5.3 Use the condensation mode firs
20、t, in which there is no light with moisture at 50C for 4 h.5.4 This is followed by 5 h of UV exposure, which is fluorescent UV lamp light and no moisture at 70C for 5 h. The glossreadings are taken as stated in 5.2 after 1, 2, 3, 4 and 5 h of exposure to UV light.Also record a visual observation of
21、the exposed,unexposed, and unpolished parts of the Q panel after the 9 h bination of 5.3 and 5.4. These are 4four separate visualobservations of the painted panel.6. Report6.1 Report the manufacturer and model of the fluorescent UV/condensation apparatus, the manufacturers designation for thefluores
22、cent UV lamp, and the relative spectral energy distribution of the lamp.6.2 For each panel, report gloss readings for polished and unpolished areas and gloss differential. Then, for the same panel,report the same three readings after 1, 2, 3, 4, and 5 h of UV exposure.7. Precision and Bias7.1 Precis
23、ion has not yet been established.7.2 This test has no bias because the values produced are defined only in terms of this practice.8. Keywords8.1 car polish; fluorescent UV/condensation; polish; Q panels; UV radiation; waxASTM International takes no position respecting the validity of any patent righ
24、ts 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 is subject to revision at any
25、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 Headquarters. Your comments will
26、 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 standard is copyrighted by ASTM
27、 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D6625 132
