ASTM_D_7834_-_13_2019.pdf

Designation:D783413(Reapproved 2019)Standard Test Method forFilling Material Shedding of Paint Brushes1This standard is issued under the fixed designation D7834;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year 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 test method describes the procedure for testing theshedding properties of both natural bristle and syntheticfilament paint brushes(referred as filling material).1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Summary of Test Method2.1 The amount of filling material removed in this testmethod is calculated to determine the shedding characteristicof the test sample.3.Significance and Use3.1 During the application of coatings,paint brushes canexhibit shedding of filling material onto the coated surface.Ameasure of this shedding filling material will determine thepaint brushs ability to resist shedding during application.4.Equipment4.1 Standard Large Brush Making Comb,typically with awood handle and steel teeth(see Fig.1).Teeth approximately.88 in.(22.2 mm)long;teeth portion of comb approximately 36teeth at 4.14 in.(105.1 mm),resulting in.15 in.(2.9 mm)toothspacing;tooth diameter approximately.048 in.(1.2 mm);4.75in.(120.7 mm)comb length-out from handle.4.2 Standard White Paper,8.5 by 11 in.(215.9 by 279.4mm).5.Sampling,Test Specimens,and Test Units5.1 Sample three identical brushes per test.6.Procedure6.1 Hold the brush test specimen over the white paper withthe filling material facing downward toward the paper at abouta 45 angle and at a distance of 5 to 6 in.(127 to 152.4 mm)above the paper.6.2 Check that the entire filling material is over the papersurface.6.3 Insert the teeth of the comb as deep as possible,atapproximately one third of the filling material length clear fromferrule edge.6.4 Push the comb through the filling material until the teethexit the tip of brush at about one stroke per second.6.5 Repeat steps 6.3 and 6.4 ten(10)times on each widthside of the brush.6.6 Pull out any visible filling material that are protrudingfrom the brush tip by hand and place on the paper.6.7 Continue to follow steps 6.3 and 6.4 five(5)times oneach thickness side of the brush.6.8 Pull out any visible filling material that are protrudingfrom the brush tip by hand and place on the paper.6.9 Fan the tip of the brush back and forth with the combfive times along the width direction and pull out any remainingloose filling material protruding from the brush tip.Theamount of depth that the tines must penetrate the brush tip isequal to the length of the tine or.88 in.(22.2 mm)deep asrecommended in 4.1.6.10 Count the number of filling material pieces that aregreater than 0.5 in.(12.7 mm)and record.Smaller pieces andbroken tips can be estimated visually and noted.7.Precision and Bias7.1 At the time of the study,there was no accepted referencematerial suitable for determining the bias for this test method.Therefore no statement of bias is being made.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.61 on Paint Application Tools.Current edition approved Oct.1,2019.Published October 2019.Originallyapproved in 2012.Last previous edition approved in 2013 as D7834 13.DOI:10.1520/D7834-13R19.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 8.Keywords8.1 brush ferrule;brush filling material;length clearASTM 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 v