ASTM_D_3776_-_D_3776M_-_09a_2013.pdf

Designation:D3776/D3776M09a(Reapproved 2013)Standard 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 Department of Defense.1.Scope1.1 These test methods cover the measurement of fabricmass per unit area(weight)and is 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 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.1.4 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.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:weight.3.2 For definitions of all other textile terms see TerminologyD123.4.Summary of Test Methods4.1 Fabric mass is calculated from the mass of a specimenthe length and width of which have been measured as directedin one of the procedures in Test Method D3773 and D3774.5.Apparatus5.1 Scale,with a capacity and sensitivity sufficient to weighthe full piece,roll,bolt,or cut units to within 60.1%of theirgross mass.The accuracy of the scale should be certified by arecognized authority.5.2 Balance,having a capacity and sensitivity to weighwithin 60.1%of the mass of the specimens being tested.5.3 Cutting Die,either square or round with an area of atleast 13 cm2or 2 in.26.Conditioning6.1 Condition test specimens as directed in Practice D1776.6.2 All weighing tests should be made in the standardatmospherefortestingtextiles(21 6 1C(70 6 2F),65 6 2%RH),after the specimens have been conditioned inthe same atmosphere.It may be impractical to condition thespecimens in Option A or nonconditioned testing may beagreed upon by the purchaser and supplier.When the full rollsor bolts of fabric cannot be properly conditioned in a reason-able time with available facilities,perform the tests withoutconditioning and report the actual conditions prevailing at thetime of the test.Such results may not correspond with theresults obtained after testing adequately conditioned specimensin the standard atmosphere for testing textiles.7.Option AFull Piece,Roll,Bolt,or Cut7.1 Significance and Use7.1.1 OptionAfor the determination of mass per unit area ofwoven fabrics may be used for acceptance testing of commer-cial shipments since it has been used extensively in the trade.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 1,2013.Published September 2013.ReplacesSections 35 to 41 of Methods D1910 64(1975).Originally approved in 1979.Lastprevious edition approved in 2009 as D3776 09a2.DOI:10.1520/D3776_D3776M-09AR13.2For 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 States1 7.1.2 In case of a dispute arising from differences inreported test values when using Test Methods D3776 foracceptance testing of commercial shipments,the purchaser andthe supplier should conduct comparative tests to determine ifthere is a statistical bias between their laboratories.Competentstatistical assistance is recommended for the investigation ofbias.As a minimum,the two parties should take a group of testspecimens which are as homogeneous as possible and whichare from a lot of material of the type in question.The testspecimens should then be randomly assigned in equal numbersto each laboratory for testing.The average results from th