1、Designation:D658313Standard Test Method forPorosity of Paint Film by Mineral Oil Absorption1This standard is issued under the fixed designation D6583;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number
2、in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method is applicable to air-dry architecturalcoatings of any type,both solvent and water-borne,and of anycolor,dark as well as light.It
3、cannot be used with films that aredissolved or excessively softened by mineral oil,but practicalexamples of such films will be encountered rarely,if ever.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This standard does
4、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.Referenced Documents2.1 ASTM Standards:
5、2D1475 Test Method For Density of Liquid Coatings,Inks,and Related ProductsD2369 Test Method for Volatile Content of CoatingsD3258 Test Method for Porosity of White or Near WhitePaint Films by StainingE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducti
6、ng an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 Definitions:3.1.1 porosity,npresence of numerous minute voids in acured material;that is,the fraction of air by volume in the dryfilm.4.Summary of Test Method4.1 The test paint is applied to a preweighed nonporous
7、panel,air dried,then reweighed to obtain the weight of thefilm.4.2 Mineral oil is applied to the surface of the paint film,allowed to absorb for a fixed period of time,and the excessremoved in a specified manner.The test panel is then re-weighed to determine the amount of mineral oil absorbed.4.3 Po
8、rosity is calculated from the weight ratio of absorbedoil to dry paint film and from previously determined values ofnon-volatile and density for the whole paint.5.Significance and Use5.1 The porosity of a paint film is closely related to theimportant practical characteristics of stain resistance,abr
9、asionresistance,durability,and the hold-out of any paint subse-quently applied.5.2 This test provides a precise means for evaluating andcomparing the quality of paint films,insofar as it pertains toporosity as determined on a coating applied to a nonporoussubstrate.Porosity measured using this test
10、method may not bean accurate predictor of coating porosity when the coating isapplied to substrate of higher absorption characteristics.5.3 Unlike current Test Method D3258 Porosity of PaintFilms,which is effective only with light colored paints,this testmethod is equally effective with paints of an
11、y color,both darkand light.Also unlike Test Method D3258,its results are notinfluenced by the hiding characteristics of the paint film.6.Apparatus and Materials6.1 Bird Type Film Applicator,150-mm wide with a clear-ance of 150 m.6.2 Bird Type Film Applicator,150-mm wide with a clear-ance of 100 m.6.
12、3 Vacuum Drawdown Plate.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.42 on Architectural Coatings.Current edition approved Nov.1,2013.Published December 2013.Originallyapp
13、roved in 2000.Last previous edition approved in 2010 as D6583 04(2010).DOI:10.1520/D6583-13.2For referenced ASTM standards,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 Summar
14、y page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.4 Test Panel.36.5 Mineral Oil,specific gravity 0.8200 to 0.8350;viscosity6.5 to 7.8 cSt at 40C.6.6 Absorbent Wipers.7.Procedure7.1 Weigh each test panel to the ne
15、arest milligram.Recordas Wp.7.2 Place the test panel on the vacuum plate and apply thepaint under test with the 150-m clearance drawdown blade.Remove the test panel from the vacuum plate and air dry as 48h under standard conditions of 23 6 2C and 50 6 5%relativehumidity.7.3 Weigh the coated test pan
16、el to the nearest milligram.Record this weight as Wp+f.7.4 Place the coated test panel on the vacuum plate andapply the mineral oil with the 100-m clearance drawdownblade making sure the entire surface of the coating is coveredby the oil.7.5 After 3 min,wipe off excess mineral oil with theabsorbent wipers.Hold the test panel at an angle to a lightsource to ascertain from its sheen if all mineral oil is removedfrom the test panel.Repeat wiping,if necessary,until the filmhas no sheen.Failure to re