ASTM D4213-2008 Standard Test Method for Scrub Resistance of Paints by Abrasion Weight Loss《磨蚀失重法测定涂料耐磨擦磨损的标准试验方法》.pdf
《ASTM D4213-2008 Standard Test Method for Scrub Resistance of Paints by Abrasion Weight Loss《磨蚀失重法测定涂料耐磨擦磨损的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D4213-2008 Standard Test Method for Scrub Resistance of Paints by Abrasion Weight Loss《磨蚀失重法测定涂料耐磨擦磨损的标准试验方法》.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 4213 08Standard Test Method forScrub Resistance of Paints by Abrasion Weight Loss1This standard is issued under the fixed designation D 4213; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision.
2、 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 test method covers an accelerated procedure fordetermining the resistance of paints to erosion caused byscrubbing. (Note: The
3、term wet abrasion is sometimes used forscrubbing, and wet abrasion resistance or scrubbability forscrub resistance.) Although scrub resistance tests are intendedprimarily for interior coatings, they are sometimes used withexterior coatings as an additional measure of film performance.1.2 The values
4、stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.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 safet
5、y and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 562 Test Method for Consistency of Paints MeasuringKrebs Unit (KU) Viscosity Using a Stormer-Type Viscom-eterD 1193 Specification for Reagent WaterD 1475 Test M
6、ethod For Density of Liquid Coatings, Inks,and Related ProductsD 2486 Test Methods for Scrub Resistance of Wall PaintsD 3450 Test Method for Washability Properties of InteriorArchitectural CoatingsD 3980 Practice for Interlaboratory Testing of Paint andRelated Materials3D 4828 Test Methods for Pract
7、ical Washability of OrganicCoatingsE70 Test Method for pH of Aqueous Solutions With theGlass ElectrodeE 180 Practice for Determining the Precision of ASTMMethods for Analysis and Testing of Industrial and Spe-cialty ChemicalsE 691 Practice for Conducting an Interlaboratory Study toDetermine the Prec
8、ision of a Test Method3. Summary of Test Method3.1 The material under test is applied to a black plastic scrubtest panel, and after drying one week, a section of the test panelis placed in a straight-line abrasion tester, adjacent to a similarsection of a standard calibration panel. The two sections
9、 arescrubbed simultaneously to produce essentially identical abra-sion experiences and the amount of erosion loss in each sectiondetermined from the panel weights before and after scrubbing.3.2 The scrub resistance on a dry-film basis is calculated asthe percent ratio of the weight loss of the calib
10、ration panel tothat of the test panel. From that value, scrub resistance iscalculated on the basis of both dry- and wet-film volume.4. Significance and Use4.1 Interior paint films often become soiled, especially neardoorways, windows, and play areas, and frequently need to becleaned by scrubbing. Th
11、is test method covers the determina-tion of the relative resistance of paints to erosion whenscrubbed.4.2 The precision of scrub resistance measurements inabsolute physical values, such as Test Methods D 2486 cycles-to-failure or this test method, microlitres per 100 cycles, is poordue to the relati
12、vely large effect of subtle and difficult-to-control variables in test conditions. The test method describedherein minimizes this problem by using a standard calibrationpanel as an integral part of each scrubbing operation andrelating its weight loss to that of the paint film under test toestablish
13、the latters scrub resistance.NOTE 1The numerical scrub resistance values obtained by this testmethod are of significance only in relation to the specific calibration panel1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings, Materials, and Applications and i
14、s the direct responsibility ofSubcommittee D01.42 on Architectural Coatings.Current edition approved Feb. 15, 2008. Published April 2008. Originallyapproved in 1983. Last previous edition approved in 2003 as D 4213 96 (2003).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcon
15、tact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Withdrawn.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.types with
16、 which the value is obtained. Thus, for example, a scrubresistance value of 83 with a Type X calibration panel would be reportedas 83X.4.3 Results obtained by this test method do not necessarilyrepresent the scrub resistance that might be determined if thetest film is allowed to dry before testing a
17、ppreciably longerthan the seven-day period specified herein.4.4 Results obtained by this test method do not necessarilyrelate to ease of soil or stain removal (also referred to as“cleanability” or “cleansability”). To test for those character-istics use Test Methods D 3450 and D 4828.5. Apparatus an
18、d Materials5.1 Straight-line Scrub Tester, set for 37 6 1 cycles perminute, having a minimum intrinsic stroke length of 255 mm(10 in.), counter for recording the number of scrub cycles, basepan, glass support plate, “Lilly” frame, and C-clamps to holddown the entire test assembly.5.2 Sponge Holder,
19、stainless steel construction, weight: 4506 10 g, approximate inside dimensions: 22 by 75 by 95 mm (78by3by334 in.).5.3 Polyurethane Sponges,4skin free, open-cell formation,density 0.032 to 0.040 g/cm3(2 to 2.5 lb/ft3), compression(25 % deflection) 4.8 kPa (0.7 psi), width and length 0.08 in. (2mm) l
20、arger than the sponge holder with which it is to be used,thickness such that when inserted into the sponge holder itprotrudes about 5 to 6 mm (0.25 in.) beyond the skirt (see Fig.1).5.4 Abrasive Pad,56-mm (14-in.) thick, cut to same size asthe sponge with which it is to be used.5.5 Film Caster, with
21、 horseshoe frame, clearance 175 m (7mils), film width approximately 135 mm (514 in.).5.6 Black Plastic Panels,6dimensions: 0.25 6 10 % by 165by 430 mm (0.01 6 10 % by 6.5 by 17 in.). Level and uniformdull black surface, impervious to and unaffected by water oraliphatic solvents, plasticizer-free, de
22、nsity 1.33 6 0.05 g/cm3.NOTE 2With dark colored paints use white panels. These should bethe same as the black except for color, and density: 1.41 6 0.05 g/cm3.5.7 Drawdown Plate, 6-mm (14-in.) thick, clear float glass,size adequate to be used as a base for drawdowns on thespecified scrub test panels
23、.5.8 Non-Abrasive Scrub Medium,7standard wetting liquid.Formula and preparation instructions are as follows:8, 9, 10FormulaParts by WeightWater, reagent, Specification D 1193, Type IV 89.6AHydroxyethyl cellulose82.0Detergent94.0Trisodium phosphate, anhydrous 4.0Acetic acid glacial 0.3BPreservative10
24、0.1100.0AVary to achieve a final consistency of 165 to 220 g (75 to 85 Krebs Units) witha Stormer viscometer in accordance with Test Method D 562.BVary to achieve a final pH from 9.5 to 10.0 in accordance with Test MethodE70.5.8.1 Slowly add the hydroxyethyl cellulose to the waterwhile stirring mech
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