ASTM_D_3776_-_D_3776M_-_20.pdf

Designation:D3776/D3776M20Standard Test Methods forMass Per Unit Area(Weight)of Fabric1This standard is issued under the fixed designation D3776/D3776M;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 These test methods cover the measurement of fabricmass per unit area(traditionally referred to as“fabric weight”)and are applicable to most fabrics.1.2 There are four approved options:1.2.1 Option AFull Piece,Roll,Bolt or Cut(Section 7).1.2.2 Option BFull Width Sample(Section 8).1.2.3 Option CSmall Swatch of Fabric(Section 9).1.2.4 Option DNarrow Fabrics(Section 10).1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system are not necessarily exact equivalents;therefore,toensure conformance with the standard,each system shall beused independently of the other,and values from the twosystems shall not be combined.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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 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:2D123 Terminology Relating to TextilesD1776 Practice for Conditioning and Testing TextilesD3773 Test Methods for Length of Woven FabricD3774 Test Method for Width of Textile Fabric2.2 Other Standard:ANSI/ASQC Z1.4 Inspection by Attributes33.Terminology3.1 The following terms are relevant to this standard:cut;weight.3.2 For definitions of all other textile terms see TerminologyD123.4.Summary of Test Methods4.1 Fabric weight is calculated from the mass of a specimenwhich has also had the length and width,or diameter measured.5.Apparatus5.1 Balance,having an appropriate capacity and sensitivityto measure mass of the specimens being tested within 60.1%of the true value.The balance should be verified and calibratedperiodically.5.2 Cutting Die,either square or round with an area of atleast 13 cm2(2 in.2),for Option C.6.Conditioning6.1 Condition test specimens as directed in Practice D1776.6.2 All tests should be made in the standard atmosphere fortesting textiles(21 6 2C(70 6 4F),65 6 5%RH),after thespecimens have been conditioned in the same atmosphere.Itmay be impractical to condition the specimens in Option A ornonconditioned testing may be agreed upon by the purchaserand supplier.When the full rolls or bolts of fabric cannot beproperly conditioned in a reasonable time with availablefacilities,perform the tests without conditioning and report theactual conditions prevailing at the time of the test.Such resultsmay not correspond with the results obtained after testingadequately-conditioned specimens in the standard atmospherefor testing textiles.1These test methods are under the jurisdiction of ASTM Committee D13 onTextiles and are the direct responsibility of Subcommittee D13.60 on Fabric TestMethods,Specific.Current edition approved July 1,2020.Published August 2020.ReplacesSections 35 to 41 of Methods D1910 64(1975).Originally approved in 1979.Lastprevious edition approved in 2017 as D3776 09a(2017).DOI:10.1520/D3776_D3776M-20.2For 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 National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.Copyright 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.7.Option A Full Piece,Roll,Bolt,or Cut7.1 Significance and Use7.1.1 Option A for the determination of fabric weight maybe used for acceptance testing of commercial shipments sinceit has been used extensively in the trade.7.1.2 In case of a dispute arising from differences inreported test values when using Test Methods D3776 foracceptance testing of commercial shipment