1、Designation:D380022Standard Test Method forDensity of High-Modulus Fibers1This standard is issued under the fixed designation D3800;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 ind
2、icates 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.Scope1.1 This test method covers the determination of the densityof high-modulus fibers
3、and is applicable to both continuous anddiscontinuous fibers.1.2 UnitsThe values stated in SI units are to be regardedas standard.No other units of measurement are included in thisstandard.1.3 This standard may involve hazardous materials,operations,and equipment.This standard does not purport toadd
4、ress all of the safety concerns,if any,associated with itsuse.It is the responsibility of the user of this standard toestablish appropriate safety,health,and environmental prac-tices and determine the applicability of regulatory limitationsprior to use.See Section 9 for additional information.1.4 Th
5、is international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(
6、TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D891 Test Methods for Specific Gravity,Apparent,of LiquidIndustrial ChemicalsD1505 Test Method for Density of Plastics by the Density-Gradient TechniqueD3878 Terminology for Composite MaterialsD5229/D5229M Test Method for MoistureAbsorption Pro
7、p-erties and Equilibrium Conditioning of Polymer MatrixComposite MaterialsD6308 Guide for Identification of Composite Materials inComputerized Material Property Databases(Withdrawn1999)3E12 Terminology Relating to Density and Specific Gravityof Solids,Liquids,and Gases(Withdrawn 1996)3E177 Practice
8、for Use of the Terms Precision and Bias inASTM Test Methods3.Terminology3.1 DefinitionsTerminology D3878 defines terms relatingto composite materials.Terminology E12 defines terms relatingto density.Practice E177 defines terms relating to statistics.Inthe event of a conflict between terms,Terminolog
9、y D3878 shallhave precedence over other standards.3.2 Symbols:3.2.1 sdensity of standard3.2.2 ldensity of liquid3.2.3 fdensity of fiber3.2.4 mfdensity of the measured fiber containing sizing3.2.5 mldensity of the measured liquid containing surfac-tant3.2.6 surdensity of surfactant3.2.7 szdensity of
10、sizing3.2.8 wdensity of water3.2.9 sstandard deviation3.2.10 M1weight of suspension wire in air3.2.11 M2weight of suspension wire in liquid(to immer-sion point)3.2.12 M3weight of suspension wire plus item whosedensity is to be determined(in air)3.2.13 M4weight of suspension wire plus item whosedensi
11、ty is to be determined(in liquid)3.2.14 M3 M1weight of item for density to be deter-mined in air3.2.15 M4 M2weight of item for density to be deter-mined in liquid1This test method is under the jurisdiction of ASTM Committee D30 onComposite Materials and is the direct responsibility of Subcommittee D
12、30.03 onConstituent/Precursor Properties.Current edition approved May 1,2022.Published May 2022.Originallyapproved in 1979.Last previous edition approved in 2016 as D3800 16.DOI:10.1520/D3800-22.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at ser
13、viceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 194
14、28-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technic
15、al Barriers to Trade(TBT)Committee.14.Summary of Test Method4.1 Procedure ABuoyancy(Archimedes)Method:4.1.1 The sample is weighed in air and weighed in a liquidthat will thoroughly wet the sample and is of a lower density.4.1.2 The difference in weight of the sample in the twomedia is the buoyancy f
16、orce.This force is converted to samplevolume by dividing it by the liquid density.The sample weightin air divided by the sample volume equals the sample density.4.2 Procedure BSink-Float Technique:4.2.1 The sample is placed in a container containing a liquidthat will thoroughly wet the sample and is of a lower density.A liquid of higher density than the sample and miscible withthe first liquid is then added slowly to the container underconstant gentle mixing until the sample is suspended in them
