ASTM_D_5251_-_05.pdf

Designation:D 5251 05Standard Practice forthe Operation of the Tetrapod Walker Drum Tester1This standard is issued under the fixed designation D 5251;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 indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice describes the equipment and operation ofthe Tetrapod Walker for testing pile floor coverings with athickness of 20 mm(0.8 in.)or less because thicker materialsimpede proper operation of the tumbler.1.2 This practice is applicable for use in testing unused pilefloor covering of all types.It is not applicable for use in testingused pile floor covering.1.3 The values stated in either acceptable SI units or in otherunits shall be regarded separately as the standard.The valuesstated in each system may not be exact equivalents;therefore,each system must be used independently of the others,withoutcombining values in any way.In case of referee decisions,theSI units shall prevail.1.4 This practice does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this practice 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:2D 123 Terminology Relating to TextilesD 1776 Practice for Conditioning Textiles for TestingD 5684 Terminology Relating to Pile Floor Coverings3.Terminology3.1 For all terminology related to Pile Floor Coverings,seeTerminology D 5684.3.1.1 The following terms are relevant to this standard:carpet,finished,finished pile yarn floor covering,floor cover-ing,lengthwise direction,pile,pile lay,pile yarn floor cover-ing,pitch,practice,primary backing,secondary backing,textile floor covering,texture,tufted fabric.3.2 For all other terminology related to textiles,see Termi-nology D 123.4.Summary of Practice4.1 The specimen is secured as the lining of a rotatabledrum with the pile surface exposed.A four legged metalcasting(tetrapod)8walks on the pile surface of the specimenas it is tumbled in the drum.The drum is rotated about itslongitudinal axis for a specified number of revolutions.5.Significance and Use5.1 This equipment may be used to bring about the changesin texture on the surface of pile floor covering caused bymechanical action.6.Apparatus,Material,and Reagent6.1 Tetrapod Tumbler Tester36.1.1 DrumConstructed of a rigid material and capped bya lid that is firmly secured.Each drum is equipped with twosprings to hold the test specimen in place during testing.Theinner dimensions of the drum are as follows:Diameter=2056 5 mm(8.0 6 0.2 in.)Height=1906 5 mm(7.6 6 0.2 in.)6.1.2 Tetrapod WalkerA metal casting,tetrahedral inshape,with four legs placed equidistant from one another.Forexample,the outermost points correspond to the points on anequilateral tetrahedron and the large angle between any twolegs is 2 rad(109.5).Each leg shall have a replaceable plasticfoot at the end.The free standing height of the tetrapod with 3of the 4 plastic feet in one plane is 125 6 2 mm(5 6 0.1 in.).The total mass of the tetrapod including the feet is 1000 6 2.5g(2.25 6 0.21 lb).The minimum hardness of the plastic feetsupplied by the manufacturer shall be 75 6 5 Type Adurometer.6.1.3 Driving SystemCradles a drum on rollers and keepsthe axis of the drum level,rotates at 5.2 6 0.2 rad/s(50 6 2rpm)and has a counter that can be preset to stop the drum afterany number of revolutions.Drive systems that do not reverseshall have the direction of rotation shown on the drum.6.2 Vacuum Cleaner,upright-type with beater bar.6.3 Solvent,either ethyl alcohol(CH3CH2CHOH),or iso-propyl alcohol,(CH3)2CHOH technical grade.1This practice is under the jurisdiction ofASTM Committee D13 on Textiles andis the direct responsibility of Subcommittee D13.21 on Pile Floor Coverings.Current edition approved March 1,2005.Published April 2005.Originallyapproved in 1992.Last previous edition approved in 2003 as D 5251 98a(2003).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.3Suitable apparatus is available from the Wira Instrumentation,3 Water Lane,Bradford BD1 2JL,England;Lawson Hemphill Sales,Inc.,P.O.Box 6388,Spartanburg,SC;Williams Asselin,Inc.,7774 Perras Blvd.,Montreal,Quebec,Canada H1E 5B2.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.7.Preparation of Specimen7.1 Marking the SpecimenBefore cutting out the testspecimen,mark on the secondary backing of each specimen thedirection of the pile lay and the direction of the tetrapod“walk”.7.2 Size of SpecimenCut the specimen app