1、Designation: D7190 10Standard Practice toEvaluate Leaching of Water-Soluble Materials from LatexPaint Films1This standard is issued under the fixed designation D7190; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last
2、 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 ability of a latex paint film toresist staining caused by the leaching of water-soluble materi-al
3、s 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 SI units are to be regarded asstandard.1.4 This standard does not purport to address all of thesafety conce
4、rns, if any, associated with its use. It is theresponsibility 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:2D1308 Test Method for Effect of Househo
5、ld Chemicals onClear and Pigmented Organic FinishesD3924 Specification for Environment for Conditioning andTesting Paint, Varnish, Lacquer, and Related Materials3. Summary of Practice3.1 Water droplets are placed on a paint film that is in itsearly stages of drying. Stains left behind are evaluated
6、forintensity and how the appearance 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
7、 as kitchens andbathrooms may also 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, suitab
8、le to obtain a wet film thicknesstypically in the range of 125-250 m (5-10 mils), or as agreedupon between manufacturer 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 u
9、sing the selected film applicator. Allow todry for 4 hours at standard atmospheric conditions of 23 6 2C(73.5 6 3.5F) and relative humidity of 50 6 5 % as specifiedin Specification D3924. Use the same film thickness whencomparing a series of latex paint films.7.2 Divide the test panel into three sec
10、tions, labeling them 4Hours, 1 Day, and 4 Days or times 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
11、 Allow the water droplets to stand for 10 minutes. Thenlift 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.8. R
12、eport8.1 Rate the test panel based on visual examination imme-diately after lifting and after an overnight dry. Visible waterstreaking with obvious gloss or color differences, or both,1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings, Materials, and Applicat
13、ions and is the direct responsibility ofSubcommittee D01.42 on Architectural Coatings.Current edition approved Dec. 1, 2010. Published December 2010. Originallyapproved in 2005. Last previous edition approved in 2005 as D7190 - 05. DOI:10.1520/D7190-10.2For referenced ASTM standards, visit the ASTM
14、website, www.astm.org, orcontact ASTM Customer Service 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
15、by the Leneta Co., 15 Whitney Rd., Mahwah, NJ07430, have been found suitable for this purpose.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.would be considered a coating failure. It is generally unaccept-able for a paint to demonst
16、rate severe staining in any testsection.8.2 Evaluate the effect on the test panel for each interval inaccordance to guidelines in Test Method D1308.9. Keywords9.1 early water resistance; exudation; latex paint; surfactantstaining; water leaching; water sensitivity; water spottingASTM International t
17、akes no position respecting 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
18、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, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addr
19、essed to ASTM International 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
20、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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).FIG. 1 Leaching of Water-Soluble Materials Test PanelD7190 102
