ASTM_D_5068_-_04_2013.pdf

Designation:D506804(Reapproved 2013)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 the safetyconcerns,if any,associated with its use.It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D3924 Specification for Environment for Conditioning andTesting Paint,Varnish,Lacquer,and Related MaterialsD5301 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.36.3 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 weightloaded 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)5001This 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 June 1,2013.Published June 2013.Originallyapproved in 1990.Last previous edition approved in 2009 as D5068 04(2009).DOI:10.1520/D5068-04R13.2For 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.3Any 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 States1 7.7 Application time shall be 15 s for 50 to 62.5-mm(2 to212in.)brushes or 20 s for the 75 to 100-mm(3 to 4 in.)brushes.7.8 Keep the angle of the handle and displacement of thefilaments of the test brush uniform throughout the entire series.When applying paint,displace the test brush filaments aboutone third to one half of the filament length and maintain thehandle somewhat perpendicular to the paint-out surface.Whenapplying paint,always start in the middle of the area to bepainted.This leaves the excess paint in the middle where it iseasiest to spread to the area being covered and will result in amore uniform coverage(see Fig.1).7.9 After application,immediately record the weight of thebrush(W3).Record the amount of paint discharged by thebrush as B,where B=W2W3.7.10 Repeat this procedure using new b