1、Designation: D 6583 04Standard Test Method forPorosity of Paint Film by Mineral Oil Absorption1This standard is issued under the fixed designation D 6583; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A
2、 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 test method is applicable to air-dry architecturalcoatings of any type, both solvent and water-borne, and of anycolor, dark as w
3、ell as light. It 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 as thestandard. The values given in parentheses are for informationonly.1.
4、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. Referenced Doc
5、uments2.1 ASTM Standards:2D 1475 Test Method for Density of Liquid Coatings, Inks,and Related ProductsD 2369 Test Method for Volatile Content of CoatingsD 3258 Test Method for Porosity of White or Near WhitePaint Films by Staining3. Terminology3.1 Definitions:3.1.1 porosity, npresence of numerous mi
6、nute 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 nonporouspanel, 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
7、 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 Porosity is calculated from the weight ratio of absorbedoil to dry paint film and from previously determined values ofnon-volatile an
8、d 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, abrasionresistance, durability, and the hold-out of any paint subse-quently applied.5.2 This test provides a precise means for evalu
9、ating 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 method may not bean accurate predictor of coating porosity when the coating isapplied to substrate of higher absorption chara
10、cteristics.5.3 Unlike current Test Method D 3258 Porosity of PaintFilms, which is effective only with light colored paints, this testmethod is equally effective with paints of any color, both darkand light. Also unlike Test Method D 3258, its results are notinfluenced by the hiding characteristics o
11、f 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.6.3 Vacuum Drawdown Plate.6.4 Test Panel.36.5 Mineral Oil, specific gravity 0.8200 to 0.8350; viscosity6.5 to 7.8 cSt
12、 at 40C.6.6 Absorbent Wipers.7. Procedure7.1 Weigh each test panel to the nearest 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.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Re
13、lated Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.42 on Architectural Coatings.Current edition approved June 1, 2004. Published July 2004. Originally approvedin 2000. Last previous edition approved in 2000 as D 6583 00.2For referenced ASTM standards, vis
14、it 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.3Transparency film AF 4300, from 3M Visual Systems Division, Austin, TX78726-4599 was used in th
15、is test method. If you are aware of alternative suppliers,please provide this information to ASTM International Headquarters. Your com-ments will receive careful consideration at a meeting of the responsible technicalcommittee,1which you may attend.1Copyright ASTM International, 100 Barr Harbor Driv
16、e, PO Box C700, West Conshohocken, PA 19428-2959, United States.Remove the test panel from the vacuum plate and air dry as 48h under standard conditions of 23 6 2C (73 6 3.5F) and 506 5 % relative humidity.7.3 Weigh the coated test panel to the nearest milligram.Record this weight as Wp+f.7.4 Place
17、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 asce
18、rtain from its sheen if all mineral oil is removedfrom the test panel. Repeat wiping, if necessary, until the filmhas no sheen. Failure to remove this excess will produceerroneous results. Results are invalid if paint film is removedduring this process.7.6 Weigh the test panel from 7.5 to the neares
19、t milligramand record as Wo.7.7 Determine the density D of the paint in g/mL and thedensity d of the saturant in g/mL, in accordance with TestMethod D 1475.7.8 Determine the nonvolatile by weight N of the paint, inaccordance with Test Method D 2369.8. Calculation8.1 Weight of Applied Paint Film:8.1.
20、1 Calculate the weight of the applied paint film asfollows:Wf5 Wp1f2 Wp(1)where:Wf= paint film, g,Wp+f= test panel and paint film, g, andWp= test panel, g.8.2 Weight of Mineral Oil Absorbed:8.2.1 Calculate the weight of the mineral oil m absorbed bythe paint film as follows:Wm5 Wo2 Wp1f(2)where:Wm=
21、mineral oil absorbed by the paint film, g,Wo= oiled test paint, g, andWp+f= test panel and paint film, g.8.3 Weight Ratio of absorbed Oil to Dry Paint Film:8.3.1 Calculate the ratio of absorbed oil to dry paint film Ras follows:R 5 Wm/ Wf(3)where:R = weight ratio of absorbed oil to dry paint film,Wm
22、= mineral oil absorbed by the paint film, g, andWf= paint film, g.8.4 Porosity:8.4.1 Calculate porosity P as follows:P 5CRNDCRND 1 d C 1 ND 2D!3 100 (4)where:C = constant of:1.00 for water-based systems, and0.78 for solvent-based systems.NOTE 1the constant C is to adjust the calculation for the diff
23、erence indensity of the solvent (water in water-based systems and a generic solventin solvent-based systems).P = porosity of paint film, expressed as a percentage,R = ratio by weight of absorbed oil to dry paint film,N = nonvolatile by weight of the whole paint,D = density of the whole paint, g/mL,
24、andd = density of the saturant, g/mL.9. Report9.1 Report the porosity of the paint film as determined in8.4.1 to 1 decimal place.10. Precision and Bias10.1 PrecisionThe precision of this test method for mea-suring porosity is being determined.10.2 BiasSince there is no accepted reference materialsui
25、table for determining the bias for the procedure in this testmethod for measuring porosity, no statement on bias is beingmade.11. Keywords11.1 film porosity; porosity; resistancepenetration (intopaint films)ASTM International takes no position respecting the validity of any patent rights asserted in
26、 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 time by the re
27、sponsible 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 receive care
28、ful 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 Internationa
29、l, 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).D6583042
