1、Designation: D 5959 96 (Reapproved 2007)Standard Test Method forBulk Density of Level Paintbrush Filaments1This standard is issued under the fixed designation D 5959; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last
2、 revision. A number 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 test method covers a procedure for measuring theweight of filaments per unit volume.1.2 This test method is applicab
3、le only to monofilamentwith consistent longitudinal (level) profiles.1.3 The values given in inch-pound units are to be regardedas the standard. The values given in parentheses are forinformation only.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with it
4、s use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Summary of Test Method2.1 The weight and volume of a bundle of filaments ismeasured, and the bundle density is
5、calculated.3. Significance and Use3.1 Filaments are available in a variety of cross sections andmaterials.Ameasure of bulk density permits the brushmaker toestimate the weight of filament required to prepare a givennumber of brushes.4. Apparatus4.1 The apparatus requires some machining, and is as-se
6、mbled as shown in Fig. 1 from the following equipment:4.1.1 Air Valve24.1.2 Miniature Air Cylinder,3dual acting, heavy duty.4.1.3 Assorted parts shown in Fig. 1 are machined from 304stainless steel and assembled as shown along with the air valveand cylinder just described. The scale must be fixed in
7、 place sothat it reads accurately the diameters of metal standards that are1.82 in. (46.2 mm) and 2.06 in. (52.3 mm) diameter.44.2 Weighing Device, accurate to 0.1 g to weigh the bundle.4.3 Scale, accurate to 0.02 in. (0.5 mm) to measure thebundle length.4.4 Air Supply, with pressure regulator set f
8、or 50 psig.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 June 1, 2007. Published August 2007. Originallyapproved in
9、 1996. Last previous addition approved in 2003 as D 5959 - 96 (2003).2Air valve such as Model 6676 available from Hunt Valve Co., 1913 E. StateStreet, Salem, Ohio 44460, or equivalent, has been found suitable for this purpose.3Miniature air cylinder such as Model H95-5D,916-in. (14.3-mm) bore, 5-in.
10、(127-mm) stoke, dual acting, heavy duty, available from Clippard InstrumentLaboratory, 7390 Colerain Road, Cincinnati, OH 45239, or equivalent, has beenfound suitable for this purpose.4An assembled bulk density test device available from T. S. Simms and Co., 33Bridge Road, St. John, New Brunswick, C
11、anada E21 E2L 4C5, or equivalent, hasbeen found suitable for this purpose.FIG. 1 Apparatus to Measure Bundle Diameter1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.5 Calibration Standards, 1.82 (46.2 mm) and 2.06 in.(52.3 mm) in d
12、iameter.55. Sampling, Test Specimens and Test Units5.1 The test result will depend on the cross-sectional shape,the polymer, and the length of the bundle selected for the test.To a lesser extent it will also depend on the filament diametersince thin filaments pack more efficiently than large ones.5.
13、2 The device, as pictured in Fig. 1, is designed to measurediameters ranging from 1.82 to 2.06 in. (46.2 to 52.3 mm).Make sure that both ends are measured and the results areaveraged.6. Procedure6.1 Select a sample of approximately 2-in. (50-mm) diam-eter. Filament may be removed from a sample so th
14、e bundlediameter falls within the scale range (1.82 to 2.06 in.) (46.2 to52.3 mm). One convenient method to adjust the samplediameter to the desired range is to fill a 2-in. (50-mm) insidediameter tube. If the sample is too small, like samples may becombined to adjust the bundle diameter to the desi
15、red range.6.2 Weigh the sample bundle to the nearest 0.1 g (W). Makesure that the weight excludes the wrap or rubber bands used tohold the filament together.6.3 Measure the lengths of five individual filaments to thenearest 0.02 in. (0.5 mm) with a ruler and average the lengthsto determine bundle le
16、ngth (L).6.4 With rubber bands holding the bundle together, roll itbetween the palms of the hands four times and then place theend of the bundle inside the loop of measuring tape in thedevice shown in Fig. 1. Operate the air valve lever 10 times tostabilize. Actuate the air valve to tighten the stee
17、l tape. Readthe bundle diameter, estimating to the nearest 0.005 in. (0.1mm) from where the pointer indicates on the scale.6.5 Release the bundle. Reverse the bundle end for end andrepeat 6.4 to remeasure the diameter.6.6 Average the results (D) and proceed to calculate the bulkdensity as described
18、in 7.1. Bulk density is expressed in g/in.3(g/cm3).7. Calculation or Interpretation of Results7.1 Calculate bulk density as follows:Bulk Density 5 4 3 W/L 3p3D2! (1)where:W = bundle weight, g,L = bundle length, in. (cm), andD = mean bundle diameter, in. (cm).8. Precision and Bias8.1 PrecisionMeasure
19、ments of bulk density of solid, levelfilament at five laboratories agreed within 60.2 g/in.3or 61%.Repeatability within the laboratory for four bundles was 60.1g/in.3for solid and 60.2 g/in.3for hollow.8.2 BiasSince there is no accepted reference materialsuitable for determining the bias for the pro
20、cedure in this testmethod, no statement on bias can be made.9. Keywords9.1 bulk density; density; filaments; paint brushASTM 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 express
21、ly 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,
22、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 att
23、end. 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.
24、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).5Steel cylinders machined to diameters of 1.82 in. with a tolerance of 0.001 in.(46.2 mm with a tolerance of 0.02 mm) and 2.060 in. with a tolerance of 0.001 in.(52.3 mm with a tolerance of 0.02 mm).D 5959 96 (2007)2
