1、Designation: D5959 12Standard Test Method forBulk Density of Level Paintbrush Filaments1This standard is issued under the fixed designation D5959; 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 () 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 applicable only to monofilame
3、ntwith consistent longitudinal (level) profiles.1.3 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.1.4 This standard does not purport to
4、 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2. Summary of Test Method2.1 The weight and volume o
5、f a bundle of filaments ismeasured, and the bundle density is calculated.3. Significance and Use3.1 Filaments are available in a variety of cross sections andmaterials. A measure of bulk density permits the brushmaker toestimate the weight of filament required to prepare a givennumber of brushes.4.
6、Apparatus4.1 The apparatus requires some machining, and is as-sembled 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
7、air valveand cylinder just described. The scale must be fixed in 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.4.2 Weighing Device, accurate to 0.1 g to weigh the bundle.4.3 Scale, accurate to 0.02 in. (0.5 mm) to measure
8、 thebundle length.4.4 Air Supply, with pressure regulator set for 50 psig.4.5 Calibration Standards, 1.82 (46.2 mm) and 2.06 in.(52.3 mm) in diameter.45. 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 sele
9、cted for the test.To a lesser extent it will also depend on the filament diametersince thin filaments pack more efficiently than large ones.5.2 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
10、 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 the 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
11、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 desired 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
12、.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 length (L).1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings, Materials, and Applications and is the direct respons
13、ibility ofSubcommittee D01.61 on Paint Application Tools.Current edition approved June 1, 2012. Published July 2012. Originally approvedin 1996. Last previous addition approved in 2007 as D5959 - 96 (2007). DOI:10.1520/D5959-12.2Air valve such as Model 6676 available from Hunt Valve Co., 1913 E. Sta
14、teStreet, 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.(127-mm) stoke, dual acting, heavy duty, available from Clippard InstrumentLaboratory, 7390 Colerain Road, Cincinnati, OH 45239, or equivalen
15、t, has beenfound suitable for this purpose.4Steel 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).Copyright ASTM International, 100 Barr Harbor Drive, PO Bo
16、x C700, West Conshohocken, PA 19428-2959. United States16.4 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 tostabi
17、lize. Actuate the air valve to tighten the steel 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 measure the diameter of the opposite end.6.6 Average the r
18、esults (D) and proceed to calculate the bulkdensity as described in 7.1. Bulk density is expressed in g/in.3,an accepted industry standard.7. Calculation or Interpretation of Results7.1 Calculate bulk density as follows:Bulk Density 5 4 3W/L 3p3D2! (1)where:W = bundle weight, g,L = bundle length, in
19、. (cm), andD = mean bundle diameter, in. (cm).8. Precision and Bias8.1 PrecisionMeasurements 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 BiasSin
20、ce there is no accepted reference materialsuitable for determining the bias for the procedure 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
21、 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 re
22、sponsible 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 care
23、ful 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 Internationa
24、l, 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 ASTM website (www.astm.org/COPYRIGHT/).FIG. 1 Apparatus to Measure Bundle DiameterD5959 122
