ASTM_D_5068_-_04_2019.pdf

Designation:D506804(Reapproved 2019)Standard Practice forPreparation of Paint Brushes for Evaluation1This standard is issued under the fixed designation D5068;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 preparation of paint brushesfor evaluation.1.2 This practice is applicable to paint brushes 50 to 100mm(2 to 4 in.)in width.1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.4 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.1.5 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.Referenced Documents2.1 ASTM Standards:2D3924 Specification for Standard Environment for Condi-tioning and Testing Paint,Varnish,Lacquer,and RelatedMaterials(Withdrawn 2016)3D5301 Practice for Physical Characterization of PaintBrushes3.Summary of Practice3.1 Using a paint chosen for the evaluation,the brush to betested is repeatedly loaded with paint and brushed over aspecified area in a specified application time.4.Significance and Use4.1 Until the paint brush is fully conditioned and wettedwith paint,only part of the paint loaded onto the brush can betransferred to the surface being painted.By properly preparingthe brush before use,the amount of paint delivered to thesurface can be made more uniform and reflect real use.5.Apparatus5.1 Container,to hold paint,for example,a quart can.5.2 Test Brush,50 to 100 mm(2 to 4 in.)in width.5.3 Balance,to weigh brush to the nearest 0.1 gram.6.Materials6.1 Test Paint.6.2 Brush-Out Panels,or other typical panels to be used.46.3 Masking Tape,to secure the panel to a flat surface.7.Procedure7.1 All tests are to be conducted in an atmosphere having atemperature of 23 6 2C(73.5 6 3.5F)and a relativehumidity of 50 6 5%(see Specification D3924).7.2 Record weight of the test brush before loading(W1)using the example format as a guide(see Table 1).Place brushout panel on scale and tare.7.3 Dip the brush into the specified paint to one-half thelength of the filament.NOTE1It is very important to assure that the depth that the brushfilaments are dipped into the paint is consistent from brushout to brushout.To aid in determining the depth to dip the filaments,a tongue depressor orother guide for the specified length can be taped to the brush ferrule.7.4 Hold the brush at the specified depth in the paint for10 s.Remove and hold the brush vertically for 30 s allowingany excess paint to drain back into the paint can.7.5 Secure the brush-out panel with masking tape to a flat,smooth,horizontal surface.7.6 After the drain period,immediately place brush on atared brush-out panel and weigh.Record the brush weight1This 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 Oct.1,2019.Published October 2019.Originallyapproved in 1990.Last previous edition approved in 2013 as D5068 04(2013).DOI:10.1520/D5068-04R19.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Any smooth type panel can be used.A Leneta 8H-BW Chart,available fromThe Leneta Co.,15 Whitney Road,Mahaw,N.J.07430 has been used in round robintesting for this purpose.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 loaded with paint(W2).Record the amount of paint picked upby the brush as A,where A=W2W1.Apply paint to thespecified initial area on the brush-out panel as indicated below:Brush Width,mm(in.)Initial Area,(cm2)50 and 62.5(2 and 212)25075 and 100(3 and 4)5007.7 Application time shall be 15 s for 5