1、Designation: D 5068 04Standard Practice forPreparation of Paint Brushes for Evaluation1This standard is issued under the fixed designation D 5068; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number
2、in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 i
3、n.) 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 establi
4、sh appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 3924 Specification for Standard Environment for Condi-tioning and Testing Paint, Varnish, Lacquer, and RelatedMaterialsD 5301 Practice for Phys
5、ical 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 wet
6、tedwith 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 qu
7、art 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
8、 an atmosphere having atemperature of 23 6 2C (73.5 6 3.5F) and a relativehumidity of 50 6 5 % (see Specification D 3924).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 specif
9、ied paint to one-half thelength of the filament.NOTE 1It 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 lengt
10、h 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
11、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.
12、) 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
13、June 1, 2004. Published July 2004. Originally approvedin 1990. Last previous edition approved in 2002 as D 5068 02.2For 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 t
14、he 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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, Wes
15、t Conshohocken, PA 19428-2959, United States.7.7 Application time shall be 15 s for 50 to 62.5-mm (2 to212 in.) 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 apply
16、ing 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 iseasies
17、t 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 brush-out panels, butthe sam
18、e brush. Do not clean brush between break-in proce-dures. Determine the amount of paint picked up by the brush(A) and amount of paint discharged (B) after the secondimmersion.7.11 Calculate the difference in weight pick-up (D) bysubtracting the difference between W2 from the second (orn + 1) applica
19、tion from W2 from the first (or n) application.7.12 Calculate the total cumulative paint pick-up (C) foreach subsequent brushout by adding the cumulative paint fromthe previous break-in (C) and the difference in weight pick-up(D) from the next break-in.7.13 Determine the percent additional pick-up v
20、ersus totalpick-up (P) using the following equation:% Additional Pick2up P! 5 D/C 3 100 (1)7.14 A brush is considered conditioned only when thepercent additional pick-up is less than 20 %. Typically this willrequire three to four break-in procedures.TABLE 1 Example CalculationInitialBreak-InBreak-In
21、1Break-In2Break-In3Break-In4Break-In5Brush Weight before Loading, grams W1 65.5 73.1 75.4Brush Weight Loaded w/Paint W2 74.7 77.4 79.0Net Paint Weight Pick Up A 9.3 4.3 3.6Brush Weight after Painting W3 73.1 75.4 77.2Net Paint Discharged B 1.6 2.0 1.8Cum Paint Weight Pick Up C 9.3 11.9 13.5Differenc
22、e in Pick Up D 9.3 2.7 1.6% Additional Pick Up versus Time P 100.0 22.4 11.8FIG. 1 Paint ApplicationD50680428. Keywords8.1 paint brush evaluationAPPENDIX(Nonmandatory Information)X1. CHOICE OF BRUSH USED IN LABORATORY BRUSHOUT TESTSX1.1 The choice of brush used in a laboratory test involv-ing brusho
23、uts to evaluate various paint properties such asleveling or hiding can have a profound effect on the resultsobtained. Applicators can begin to understand about the prob-able performance of a brush by reviewing Practice D 5301.Brush performance is affected by the way that the filament tipsare shaped
24、such as flat, dome shaped or chiseled to a tip orflagged, or both, and level or tapered. Filaments come in avariety of shapes and compositions. Always use a high qualitypaint brush when performing any laboratory tests.ASTM International takes no position respecting the validity of any patent rights
25、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 tim
26、e 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 r
27、eceive 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 I
28、nternational, 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).D5068043
