1、Designation: D6736 08 (Reapproved 2013)Standard Test Method forBurnish Resistance of Latex Paints1This standard is issued under the fixed designation D6736; 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 () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This test method covers a procedure for measuring theresistance of latex paints to burnishing under dry conditions.1.2 The values s
3、tated 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 safety
4、 and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D523 Test Method for Specular GlossD2486 Test Methods for Scrub Resistance of Wall PaintsD3924 Specification for Environment for Conditioning andTesting Paint, Var
5、nish, Lacquer, and Related Materials3. Terminology3.1 Definitions:3.1.1 burnish resistance, nthe ability of a coating to resistan increase in its gloss (sheen) value after polishing or rubbing.4. Summary of Test Method4.1 Test paints are drawn down lengthwise on plastic panelsusing a 0.18-mm (7.0-mi
6、l) applicator and allowed to air-dry forone week. Gloss readings are taken at three equally spacedpoints, lengthwise along the center of the panel. The panel isthen rubbed for 20 cycles on a scrub machine, after which glossreadings are again taken along the same path abraded by thescrub machine. The
7、 initial values are averaged and the finalvalues are averaged. The difference between the initial andfinal gloss readings, divided by the initial reading times 100 isa quantitative indication of the paints resistance to burnishing.Higher percentage increases denote poorer resistance andvice-versa.5.
8、 Significance and Use5.1 Interior flat paints may become burnished in areas whereclothing or upholstered furniture rub against a wall. Thisrubbing may cause a smoother, glossier surface at the contactedarea, depending on the level or type of pigments in the paintand binder hardness. This method perm
9、its a more quantitativeestimate of burnish resistance than those using manual rubbingtechniques.6. Apparatus6.1 Constant temperature/humidity room 23 6 2C (73.5 63.5F); 50 6 5 % relative humidity (standard conditions,Specification D3924).6.2 Washability Machine (Scrub Machine), described in TestMeth
10、ods D2486.6.2.1 Accessory Apparatus:6.2.1.1 Sandpaper Attachment, total weight 454 g.6.2.1.2 Glass Plate, measured to fit.6.2.1.3 Gasket Frame and Clamps.6.3 Large Vacuum Plate.6.4 Film Caster, having a 0.18-mm (7.0-mil) clearance.6.5 Glossmeter(s), capable of measuring 60 and 85 glossin accordance
11、with Test Method D523.7. Materials7.1 Plastic Scrub Panels, 43.5 by 16.5 mm (17 by 6.5 in.),white or black.7.2 Cheesecloth, 4-ply, medium weave.38. Procedure8.1 Application and Evaluation of Test Paints:8.1.1 Attach a plastic panel to the vacuum plate and drawdown the test paint uniformly lengthwise
12、, using the 0.18-mm(7.0-mil) side of the applicator.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 Feb. 1, 2013. Publ
13、ished February 2013. Originallyapproved in 2001. Last previous edition approved in 2008 as D6736 08. DOI:10.1520/D6736-08R13.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information,
14、refer to the standards Document Summary page onthe ASTM website.3Bleached cheesecloth, grade 20B, 24/20 (medium) weave was used in devel-oping this method.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohoc
15、ken, PA 19428-2959. United States18.1.2 Condition the panels for one week in the constanttemperature / humidity room or under other conditions agreedupon between the buyer and seller.8.1.3 Take three equally spaced gloss readings (Test MethodD523) along the center length of the panel, making sure th
16、eareas of the readings are within the travel path of the scrubmachine attachment. The resulting average of the three read-ings is used as the initial value prior to rubbing the panel. It issuggested that the gloss readings should be as follows:Semi-Gloss Paints 60Sheen Paints 60 and 85Flat Paints 85
17、In general, if the 60 reading drops below 20 units the 85reading should be recorded.8.1.4 Secure one layer of 4-ply cheesecloth lengthwise inthe sandpaper attachment of the scrub machine.8.1.5 Secure the panel on the scrub machine over the glassplate using the gasket and clamps. Attach the sandpaper
18、attachment to the scrub machine. Start the machine.8.1.6 Abrade the panel for 20 reciprocating cycles. Stop themachine.8.1.7 Remove the panel from the scrub machine and care-fully clean off any loose pigment from the panel. Re-read thepanel, again taking three equally spaced gloss readings alongpath
19、 of the burnished area. Average the values and use thisaverage as the final after burnishing value.9. Report9.1 Report the following information:9.1.1 The application clearance, if different than thosespecified in this test method.9.1.2 The drying time and conditions used, if different thanthose spe
20、cified in this test method.9.1.3 The number of cycles used in abrading the panels, ifdifferent than the number specified in this test method.9.1.4 The gloss angles used and the initial and final glossunits.9.1.5 The total weight the sandpaper attachment used in thetest.9.1.6 The percent increase in
21、gloss calculated by subtractingthe initial average reading from the final average reading,dividing by the initial reading, and multiplying by 100.10. Precision and Bias410.1 Interlaboratory Experimental Approach:10.1.1 The precision of this test method is based on aninterlaboratory study (research r
22、eport is filed with ASTM) ofTest Method D6736. Each of six laboratories tested the burnishresistance of latex paints. The percentage of gloss increase wasdetermined for a total of five different paints, with threereplicates of the analysis being performed on each sample.Results from the interlaborat
23、ory study are summarized in Table1.10.1.2 Because different paint formulations vary in theirability to resist gloss change from burnishing, precision willalso vary. This interlaboratory study included samples fromfive different paint formulations each with different burnishingcharacteristics. The In
24、itial 85 Gloss and the Mean x! %85Gloss Increase results for the samples are displayed in Table 1.10.2 Precision:10.2.1 RepeatabilityTwo test results obtained within onelaboratory shall be judged not equivalent if they differ by morethan the “r” value for that material; “r” is the intervalrepresenti
25、ng the critical difference between two test results forthe same material, obtained by the same operator using thesame equipment on the same day in the same laboratory.Repeatability for the five paints selected for this interlaboratorystudy ranged from 4 to 33 %.10.2.2 ReproducibilityTwo test results
26、 should be judgednot equivalent if they differ by more than the “R” value for thatmaterial; “R” is the interval representing the difference be-tween two test results for the same material, obtained bydifferent operators using different equipment in different labo-ratories study ranged fro 5 to 36 %.
27、10.2.3 Any judgment in accordance with statements 10.1.1or 10.1.2 would have an approximated 95 % probability ofbeing correct.10.3 BiasAt the time of the study there was no acceptedreference material suitable for determining the bias for this testmethod, therefore no statement on bias can be made.11
28、. Keywords11.1 abrasion resistance; burnish resistance; polishing4Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR: RR:D01-1142.TABLE 1 Results From Interlaboratory StudyMaterialInital85 % Glossx(% 85 GlossIncrease)rRPaint A 3.0 6
29、5.2 13.5 25.6Paint B 1.9 93.8 30.8 36.3Paint C 3.5 106.6 33.2 33.4Paint D 24.5 7.8 3.8 4.7Paint E 23.8 28.7 5.0 7.4D6736 08 (2013)2SUMMARY OF CHANGESCommittee D01 has identified the location of selected changes to this standard since the last issue (D6736 - 01)that may impact the use of this standar
30、d. (Approved February 1, 2008.)(1) Added Precision and Bias section.ASTM 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 validity of any
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