ASTM_D_8132_-_D_8132M_-_17.pdf

Designation:D8132/D8132M17Standard Test Method forDetermination of Prepreg Impregnation by PermeabilityMeasurement1This standard is issued under the fixed designation D8132/D8132M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method determines the in-plane permeability ofcomposite prepreg(pre-impregnated)materials as a measure oflevel of impregnation.Permissible prepreg materials includethose reinforced with carbon,glass,aramid,thermoplastic andother fibers impregnated with a thermoset or thermoplasticmatrix resin,creating a single ply sheet material.The reinforce-ments may be unidirectional or woven fabrics.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.2.1 Within the text,the inch-pound units are shown inbrackets.1.3 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,health and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This 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(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:D883 Terminology Relating to PlasticsD3878 Terminology for Composite MaterialsE122 Practice for Calculating Sample Size to Estimate,WithSpecified Precision,the Average for a Characteristic of aLot or ProcessE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE456 Terminology Relating to Quality and StatisticsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 DefinitionsTerminology D3878 defines terms relatingto high-modulus fibers and their composites.TerminologyD883 defines terms relating to plastics.Terminology E456 andPractice E177 define terms relating to statistics.In the event ofa conflict between terms,Terminology D3878 shall haveprecedence over the other terminologies.3.2 Definitions of Terms Specific to This Standard:3.2.1 as castpertaining to the transparent and smoothsurface of an acrylic block.3.2.2 acrylic block assemblythe acrylic blocks nestedtogether or clamped together but that are otherwise oriented orjoined together only for a temporary process.3.2.3 cut sidemachined surface of an acrylic block.3.2.4 permeabilityMaterial property that determines flowthrough a porous medium.Used to determine the air transportof prepreg materials in the in-plane directions.3.2.5 permeability test apparatusthe vacuum test chamberwith known volume where the permeability test specimen ismounted and tested to determine permeability.3.2.6 permeability test specimenthe vacuum test chamberwith known volume where the permeability test specimen ismounted and tested to determine permeability.3.3 SymbolsA=cross-sectional area of the prepreg test specimenCV=coefficient of variation statistic of a sample populationfor a given property(in percent)FAW=fiber areal weightH=prepreg thicknessID=inner diameterK=permeabilityKn=normalized permeability(independent of prepregthickness)L=length of prepreg sampleOD=outer diameter1This test method is under the jurisdiction of ASTM Committee D30 onComposite Materials and is the direct responsibility of Subcommittee D30.03 onConstituent/Precursor Properties.Current edition approved Aug.1,2017.Published September 2017.DOI:10.1520/D8132_D8132M-17Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.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 Technical Barriers to Trade(TBT)Committee.1 P=absolute pressure in vacuum chamber(P as a function oftime)Patm=actual atmospheric pressurePi=initial absolute pressure in vacuum chamber(Piabsattime 0)RH=relative humiditySn-1=standard deviation statistic of a sample population fora given propertyx1=test result for an individual specimen from the samplepopulation for a given propertyx =mean or average(estimate of mean)of a samplepopulation for a given property4.Summary of Test Method4.1 This test method consists of impa