1、Designation: D5064 07 (Reapproved 2012)Standard Practice forConducting a Patch Test to Assess Coating Compatibility1This standard is issued under the fixed designation D5064; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year
2、 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 procedures for testing coatingcompatibility when maintenance of an in-place coating syste
3、mis being contemplated. It does not cover procedures forassessing the integrity of the existing coating to determine if itcan be repainted, nor does it establish the compatibility of themaintenance coating system with the substrate or corrosionproducts. The practice is intended for use in the field.
4、NOTE 1Pass-Fail Criteria (for example, adhesion requirements) arenot established by this practice. These should be established by the user orspecifier with input from the supplier.1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for information
5、only.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 establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referen
6、ced Documents2.1 ASTM Standards:2D16 Terminology for Paint, Related Coatings, Materials, andApplicationsD3359 Test Methods for Measuring Adhesion by Tape TestD4138 Practices for Measurement of Dry Film Thickness ofProtective Coating Systems by Destructive, Cross-Sectioning MeansD4414 Practice for Me
7、asurement of Wet Film Thickness byNotch GagesD4541 Test Method for Pull-Off Strength of Coatings UsingPortable Adhesion TestersD6132 Test Method for Nondestructive Measurement of DryFilm Thickness of Applied Organic Coatings Using anUltrasonic GageD6677 Test Method for Evaluating Adhesion by KnifeD7
8、091 Practice for Nondestructive Measurement of DryFilm Thickness of Nonmagnetic Coatings Applied toFerrous Metals and Nonmagnetic, Nonconductive Coat-ings Applied to Non-Ferrous MetalsD7234 Test Method for Pull-Off Adhesion Strength of Coat-ings on Concrete Using Portable Pull-Off Adhesion Tes-ters3
9、. Terminology3.1 DefinitionsFor definitions of terms used in this prac-tice, refer to Terminology D16.4. Summary of Test Method4.1 The materials under test are applied to the previouslypainted surface after proper surface preparation. After theappropriate time has elapsed, the test patch is examined
10、 forvisual defects and adhesion is determined.5. Significance and Use5.1 In performing maintenance of a coating system, the newcoating being applied must be compatible with the existingcoating. While general guides exist which indicate compatibil-ity of different generic types of coatings, differenc
11、es inmanufacturers formulation and the condition of the in-placecoating may affect compatibility.6. Procedure6.1 Select test locations for evaluation that properly charac-terize differences in configuration of the structure and expo-sure; that is, vertical versus horizontal surfaces and shelteredver
12、sus unsheltered exposure.Aminimum of three test locationswith one test patch in each is recommended.6.2 The size of each test patch will be determined by thesize and configuration of the test locations. Each test patchshall be as large as possible, with a minimum size of 1.0 m2(10.8 ft2) recommended
13、.6.3 Prepare the surface of the test areas using the methodsspecified for the maintenance painting procedure (Note 2).Alternative methods of preparation may also be evaluated inseparate, adjacent tests.1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings, Mater
14、ials, and Applications and is the direct responsibility ofSubcommittee D01.46 on Industrial Protective Coatings.Current edition approved June 1, 2012. Published August 2012. Originallyapproved in 1990. Last previous edition approved in 2007 as D5064 07. DOI:10.1520/D5064-07R12.2For referenced ASTM s
15、tandards, visit the ASTM 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.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken
16、, PA 19428-2959. United States1NOTE 2This test method assesses compatibility with the existingcoating only and does not apply to areas where the substrate is exposed bythe methods of preparation.6.4 Measure the existing coating thickness in accordancewith Test Methods D6132, D4138, or Practice D7091
17、,asappropriate for the substrate.6.5 Measure the ambient conditions and surface temperatureand assure the conditions are within the limits specified by thecoatings manufacturer for the product being tested.6.6 Apply the test coating to the thickness recommended forthe particular job. Use the applica
18、tion technique as intended foruse on the full-scale job. If agreed upon between the purchaserand the seller, the method of coating application may bedifferent from that used on the job, that is, brush application ofthe test patch even though spray application will be used on thejob. However, this ca
19、n cause some error and is not generallyrecommended.6.7 Immediately after application, measure the wet-filmthickness in accordance with Practice D4414. Make correc-tions to the application, if necessary, by either applying morematerial if the expected dry-film thickness is low or applyinganother test
20、 patch if the expected dry-film thickness is abovethe recommended maximum. Inspect each patch for applica-tion defects such as runs, sags, and holidays. If such defectscannot be corrected as a part of the initial application process,prepare a new test patch.6.8 After the coating has dried, measure t
21、he dry-film thick-ness in accordance with Test Methods D6132, D4138,orD7091.NOTE 3When using Test Method D6132 or Practice D7091, the dryfilm thickness is the difference in average thickness of the coating systemless the average thickness of the in-place coating.6.9 Allow the coating to cure or weat
22、her prior to testing.Cure durations are defined as long term and short term.Long-term curing provides the most reliable assessment ofcompatibility. Short-term curing provides for more rapid evalu-ation of results, but may not reveal all potential compatibilityproblems.6.9.1 Long-Term CuringCuring fo
23、r as long a time aspossible, with a minimum of six months preferred. Curingshould span seasonal weather changes.6.9.2 Short-Term CuringCuring at the following mini-mum times based on average daily (24 h) temperatures:10C (50F) 21C (70F) 32C (90F)14 days 10 days 7 daysLonger minimum cure times are ac
24、ceptable if manufacturerrequires longer minimum cure times.6.10 After curing, examine the total surface of each testpatch for wrinkling, blistering, mudcracking, checking, crack-ing, peeling, lifting, and disbonding. Measure or rate theadhesion in a minimum of five locations per test patch inaccorda
25、nce with Test Methods D3359 or D6677. If agreedupon between the purchaser and the seller, adhesion testing inaccordance with Test Methods D4541 or D7234 may be used.6.11 Examine the test patches for the defects noted in 6.10on a regular schedule, discounting rust caused by previous testssuch as adhe
26、sion measurements and destructive film thicknessmeasurements.7. Report7.1 Report the following information:7.1.1 The identity of the structure tested, the location andsize of the test patches, the identity of the test coating, themethod and grade of surface preparation, and the method ofcoating appl
27、ication.7.1.2 For each test patch, the dry film thickness measure-ments and average of the in-place coating, the dry filmthickness measurements and average of the test coating, theelapsed time for each evaluation, the visual defects noticed,and the results of adhesion tests.8. Keywords8.1 coating; c
28、oating compatibility; coating test patch; paint;paint compatibility; test patchASTM 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 advised that determination of the vali
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32、opies) 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/).D5064 07 (2012)2
