1、Designation: D 7190 05Standard Practice toEvaluate Leaching of Water-Soluble Materials from LatexPaint Films1This standard is issued under the fixed designation D 7190; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of la
2、st 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 covers the ability of a latex paint film toresist staining caused by the leaching of water-soluble materi
3、als when contacted with water shortly after application.1.2 Water staining is attributed to the leaching of surfactantsor other water-soluble materials from a paint film.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach s
4、ystem may not be exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is ther
5、esponsibility of the user of this standard to establish appro-priate safety and health practices and to determine theapplicability of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 1308 Test Method for Effect of Household Chemicals onClear and Pigmented Organic Fini
6、shes.D 3924 Specification for Standard Environment for Condi-tioning and Testing Paint, Varnish, Lacquer, and RelatedMaterials3. Summary of Practice3.1 Water droplets are placed on a paint film that is in itsearly stages of drying. Stains left behind are evaluated forintensity and how the appearance
7、 of the coating has changed.4. Significance and Use4.1 Surfactant staining is a common problem with exteriorhouse paints, particularly when subjected to humid environ-ments (such as morning dew) shortly after application.4.2 Interior paints used in humid areas such as kitchens andbathrooms may also
8、experience surfactant staining.4.3 Leaching of water-soluble materials may be dependenton colorant dispersions that are mixed into tint base paints.Other paint components may also affect the leaching ofwater-soluble materials.5. Apparatus5.1 Film Applicator, suitable to obtain a wet film thicknessty
9、pically in the range of 5-10 mils, or as agreed upon betweenmanufacturer and supplier.6. Materials6.1 Black plastic panels.36.2 Distilled water.6.3 Syringe, 1.0 cc.7. Procedure7.1 Apply the test paint along the long dimension of theblack plastic panel using the selected film applicator. Allow todry
10、for 4 hours at standard atmospheric conditions of 73.5 63.5F and relative humidity of 50 6 5 % as specified inSpecification D 3924. Use the same film thickness whencomparing a series of latex paint films.7.2 Divide the test panel into three sections, labeling them 4Hours, 1 Day, and 4 Days or times
11、agreed upon by themanufacturer and supplier. (Fig. 1)7.3 Place a row of four droplets of distilled water at roomtemperature across the top of the first designated section of thetest paint. Each droplet shall be approximately 0.1 cc involume.7.4 Allow the water droplets to stand for 10 minutes. Thenl
12、ift the panel into a vertical position so the water droplets rundown the section of the paint film being evaluated.7.5 Repeat steps 7.3 and 7.4 after 1 and 4 Days, or otherdesignated intervals, in their respective sections of the testpanel.1This practice is under the jurisdiction of ASTM Committee D
13、01 on Paint andRelated Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.42 on Architectural Coatings.Current edition approved July 1, 2005. Published July 2005.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Servi
14、ce at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Dull black plastic panels, P-121-10N, 165 by 432 (612 by 17 in.,) 0.25 mm (10mils) thickness, manufactured by the Leneta Co., 15 Whitney Rd., Mahwah, NJ07430,
15、have been found suitable for this purpose.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.8. Report8.1 Rate the test panel based on visual examination imme-diately after lifting and after an overnight dry. Visible waterstreaking with
16、 obvious gloss or color differences, or both,would be considered a coating failure. It is generally unaccept-able for a paint to demonstrate severe staining in any testsection.8.2 Evaluate the effect on the test panel for each interval inaccordance to guidelines in Test Method D 1308.9. Keywords9.1
17、early water resistance; exudation; latex paint; surfactantstaining; water leaching; water sensitivity; water spottingASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly
18、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 time by the responsible technical committee and must be reviewed every five years andif not revised, eit
19、her 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 receive careful consideration at a meeting of theresponsible technical committee, which you may attend
20、 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 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).FIG. 1 Leaching of Water-Soluble Materials Test PanelD7190052
