1、Designation:D150510Standard Test Method forDensity of Plastics by the Density-Gradient Technique1This standard is issued under the fixed designation D1505;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A nu
2、mber in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This test method covers the determination of the densit
3、yof solid plastics.1.2 This test method is based on observing the level towhich a test specimen sinks in a liquid column exhibiting adensity gradient,in comparison with standards of knowndensity.NOTE1This test method is equivalent to ISO 1183-2.1.3 The values stated in SI units are to be regarded as
4、 thestandard.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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Ref
5、erenced Documents2.1 ASTM Standards:2D883 Terminology Relating to PlasticsD2839 Practice for Use of a Melt Index Strand for Deter-mining Density of PolyethyleneD4703 Practice for Compression Molding ThermoplasticMaterials into Test Specimens,Plaques,or SheetsE691 Practice for Conducting an Interlabo
6、ratory Study toDetermine the Precision of a Test Method2.2 ISO Standard:ISO 1183-2Methods for Determining the Density andRelative Density of Noncellular Plastics33.Terminology3.1 Refer to Terminology D883 for definitions of otherterms relating to this test method.3.2 Definitions:3.2.1 density of pla
7、sticsthe weight per unit volume ofmaterial at 23C,expressed as follows:D23C,g/cm3(1)NOTE2Density is to be distinguished from specific gravity,which isthe ratio of the weight of a given volume of the material to that of an equalvolume of water at a stated temperature.4.Significance and Use4.1 The den
8、sity of a solid is a conveniently measurableproperty which is frequently useful as a means of followingphysical changes in a sample,as an indication of uniformityamong samples,and a means of identification.4.2 This test method is designed to yield results accurate tobetter than 0.05%.NOTE3Where accu
9、racy of 0.05%or better is desired,the gradienttube shall be constructed so that vertical distances of 1 mm shall representdensity differences no greater than 0.0001 g/cm.3The sensitivity of thecolumn is then 0.0001 g/cm3mm.Where less accuracy is needed,thegradient tube shall be constructed to any re
10、quired sensitivity.5.Apparatus5.1 Density-Gradient TubeA suitable graduate withground-glass stopper.45.2 Constant-Temperature BathA means of controllingthe temperature of the liquid in the tube at 23 6 0.1C.Athermostatted water jacket around the tube is a satisfactory andconvenient method of achievi
11、ng this.5.3 Glass FloatsA number of calibrated glass floats cov-ering the density range to be studied and approximately evenlydistributed throughout this range.5.4 Pycnometer,for use in determining the densities of thestandard floats.5.5 Liquids,suitable for the preparation of a density gradi-ent(Ta
12、ble 1).1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.70 on Analytical Methods(Section D20.70.01).Current edition approved July 1,2010.Published September 2010.Originallyapproved in 1957.Last previous edition approved
13、 in 2003 as D1505-03.DOI:10.1520/D1505-10.2For 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.3Available from American
14、 National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.4Tubes similar to those described in Refs(1)and(2)may also be used.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Con
15、shohocken,PA 19428-2959.United States1 NOTE4It is very important that none of the liquids used in the tubeexert a solvent or chemical effect upon the test specimens during the timeof specimen immersion.5.6 HydrometersA set of suitable hydrometers coveringthe range of densities to be measured.These h
16、ydrometers shallhave 0.001 density graduations.5.7 Analytical Balance,with a sensitivity of 0.0001 g orbetter.5.8 Siphon or Pipet Arrangement,for filling the gradienttube.This piece of equipment shall be constructed so that therate of flow of liquid may be regulated to 10 6 5 mL/min.6.Test Specimen6.1 The test specimen shall consist of a piece of the materialunder test.The piece shall be cut to any shape convenient foreasy identification,but shall have dimensions that permit themost accurate pos
