ASTM_D_6957_-_12_2018.pdf

Designation:D695712(Reapproved 2018)Standard Practice forMeasuring Curl in Paint Brush Filling Material1This standard is issued under the fixed designation D6957;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 practice describes the procedure for measuring curlin synthetic filament.1.2 This practice is applicable to filament 2 to 5 in.(50.8 to127 mm)in length.1.3 This practice is applicable to tapered filament or levelfilament.1.4 This practice is applicable to loose filling material andmaterial removed from a brush.1.5 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.1.6 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.1.7 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.Terminology2.1 Definitions of Terms Specific to This Standard:2.1.1 paint brush filament,na synthetic polymer extrusionused in brushing material.2.1.2 filament curl,ndeviation from straight,along thelength of a filament.2.1.3 butt-end,nthe larger end of a tapered filament;either end of a level filament.3.Significance and Use3.1 It is important for the manufacturing and performance ofa brush to have filaments with minimal curl.4.Apparatus4.1 Filament curl deviation chart.See Fig.1.5.Procedure5.1 For Testing Synthetic Filaments:5.1.1 Select filaments to be measured.5.1.2 Allow filaments to acclimate to room temperature 70to 75F(21 to 24C)at least two hours.5.1.3 Place a filament on the filament curl deviation chartwith butt-end at the x-reference point(see Fig.1).5.1.4 Record the degree of deviation from straight at theother end of the filament.5.1.5 If multiple filaments of the same type and length are tobe measured,repeat 5.1.3 and 5.1.4 for each of the remainingfilaments and average the results.6.Keywords6.1 curl;filament1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.61 on Paint Application Tools.Current edition approved Sept.1,2018.Published September 2018.Originallyapproved in 2003.Last previous edition approved in 2012 as D6957 12.DOI:10.1520/D6957-12R18.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 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 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 responsible 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 careful 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 International,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).Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center,222Rosewood Drive,Danvers,MA 01923,Tel:(978)646-2600;http:/ Filament Curl Deviation ChartD6957 12(2018)2