900927bO025974bit7X.IDesignation:D2529-744CTBStandardTestMethodforBURSTINGSTRENGTHOFPAPERBOARDANDLINERBOARD’ThisStandardisissuedunderthefixeddesignationD2529:thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.1.scope1.1Thismethodcoversaprocedureformeasuringtheburstingstrengthofpaperboard,includinglinerboard,employingadisk-shaped,moldeddiaphragm-typeinstrument.NOTEI-Fortheburstingstrengthofpaper,seeASTMMethodD774,TestforBurstingStrengthofPaper.3FortheburstingstrengthofcorrugatedandsolidFiberboard,seeASTMMethodD2738,TestforBurstingStrengthofCorrugatedandSolidFiberb~ard.~2.ApplicableDocuments2.1ASTMStandards:D585SamplingandAcceptingaSingleLotofPaper,Paperboard,Fiberboard,orRelatedProductsD641ConditioningPaperboard,Fiber-board,andPaperboardContainersforTesting33.SummaryofMethod3.1Aspecimenofboardisclampedbe-tweentwoplatenswithcircularopeningsinthecenter.Anexpansiblediaphragmisdis-tendedthroughthelowerplatenbymeansofhydraulicpressureuntilthespecimenbursts.Themaximumhydraulicpressurewhenwhichthespecimenrupturesisrecorded.4.Significance4.1Theburstingstrengthtestofpaper-board,includinglinerboard,isacompositemeasureofcertainpropertiesofthesheetstructure,principallytensilestrengthandelongation.Ingeneral,burstingstrengthisdependentonthetype,proportion,prepara-tion,andamountofthefiberspresentinthesheetandontheirformation,internalsizing,andtosomedegree,thesurfacetreatment.Whileburstingstrengthisanempiricalprop-erty,thistest,incombinationwithbasisweight,servestodefine“standardgrades”incom-merce.5.Apparatus5.1BurstingTester,consistingofthefol-lowing:5.1.1Meansforclampingthetestspecimenbetweentwoannular,planesurfaceshavingfineconcentrictoolmarkstominimizeslip-page.Theupperclampingplaten(clampingring)shallhaveadiameterof3.75in.(95mm),athicknessof0.375in.(9.5‘mm),andacircularopening1.240+0.001in.(31.50+0.02mm)indiameter.Theloweredgeoftheopening(sideincont...
