ASTM_D_7506_-_D_7506M_-_12.pdf

Designation:D7506/D7506M12Standard Test Method forPocket Reinforcement1This standard is issued under the fixed designation D7506/D7506M;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 utilizes the grab procedures to deter-mine localized weakness due to bar-tacking in the pocket areasof all types of garments.This can be utilized to test bar-tackingin the pockets of shirts,as well as side or back pockets oftrousers,pants,or jeans.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.1.3 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D76 Specification for Tensile Testing Machines for TextilesD123 Terminology Relating to TextilesD1776 Practice for Conditioning and Testing TextilesD5034 Test Method for Breaking Strength and Elongation ofTextile Fabrics(Grab Test)3.Terminology3.1 Definitions3.1.1 constant-rate-of-extension tensile testing machine(CRE),na testing machine in which the rate of increase ofspecimen length is uniform with time.3.1.2 grab test,nin fabric testing,a tensile test in whichthe central part of the width of the specimen is gripped in theclamps.3.1.3 tensile test,nin textiles,a test in which a textilematerial is stretched in one direction to determine the loadelongation characteristics,in the breaking load,or the breakingelongation.3.1.4 For definitions of other terms used in this test method,refer to Terminology D123.4.Summary of Test Method4.1 A specimen of the pocket area with the bar-tacking ismounted centrally in clamps of the tensile strength machineand a force is applied until the specimen breaks5.Apparatus5.1Constant-rate-of-extension(CRE)tensile testingmachine,as used in Test Method D5034,conforming toSpecification D76.5.2 Clamps and jaws,rubber faced or other grippingsurfacejaw faces must measure 1.0 6 0.02 in.(25 6 1mm)wide at least 1 in.(25mm),perpendicular to the direction ofthe force,and not less than 25 nor more than 50 mm(1.0 normore than 2.0 in.).The back,or bottom,jaw face of each clampshall be at least as large as its mate.Use of a larger face for thesecond jaw reduces the problem of front and back jaw facemisalignment.6.Safety Precuations6.1 It is the users responsibility to use safe and propertechniques when handling or using any of the equipmentmentioned.6.2 Good laboratory practice should be followed.Wearsafety glasses in all laboratory test rooms.7.Sampling,Test Specimens,and Test Units7.1 Cut the garment or the side pockets as shown in Figs.1-4.If multiple samples are available,cut,if possible,aminimum of 3 specimens.If not,test an agreed upon numberof samples.8.Preparation of Apparatus8.1 Tensile Testing Machine:8.1.1 Prepare the machine according to the manufacturersinstructions.1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.54 on Subassemblies.Current edition approved April 1,2012.Published May 2012.Originallyapproved in 2009.Last previous edition approved in 2009 as D7506/D7506M-09.DOI:10.1520/D7506_D7506M-12.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 8.1.2 Set the distance between the clamps at 3.0 6 0.02 in.(75 6 1 mm)at the crosshead speed set at 12 in./min(305mm/min).8.1.3Select the force range of the testing machine for thebreak to occur between 10%and 90%of the full-scale force.Calibrate or verify the testing machine for this range.8.2 Clamping System:8.2.1 Check the jaw face surfaces for flatness and parallel-ism.8.2.2 Make a four-ply sandwich or white tissue paper,twosoft carbon papers placed back to back,and a second whitepaper(or fold the paper over the two carbons).8.2.3 Mount the papercarbon sandwich and examine thejaw face imprint of uniformity of the carbon deposition on thetissue paper.8.2.4 If the imprint is incomplete or offsize,make appro-priate adjustments of the clamping gripping system and re-check the clamping system with a paper and carbon sandwich.NOTE1Some sources of clamping irre