ASTMD3299*EL5507595300073785T({lbDesignation:D1299-55(Reapproved1979)"AnAmericanNationalStandardAMERICANSOCIETYFORTESTINGANDMATERIALS1916RaceStPhiladelphia,Pa19103ReprintedtorntheAnnualBookoIASfh4Standards.CopyrightASTMIlnotlistedinthecurrentcornblnedInde&w'IIappearInthenextedtion.StandardTestMethodforShrinkageofMoldedandLaminatedThermosettingPlasticsatElevatedTemperature'ThisstandardisissuedunderthefixeddesignationD1299:thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.ThehazardcaveatwasaddededitohllyinJanuary1991.1.Scope1.1Thistestmethodcoversthedeterminationoftheshrinkagecharacteristicsofvariousthermosettingmoldedandlaminatedplasticsafterexposuretocertainprescribedtemperatures.1.2Thetestisnotexpectedtopredictthebehaviorofmaterialsinservice,butratherprovidesameansofclassi-fyingplasticswithrespecttoshrinkageonarelativebasis.NOTE1-ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.3Thisstandarddoesnotpurporttoaddressthesafetyproblemsassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse,2.Significance2.1Plasticsexperiencedimensionalchangeatelevatedtemperaturesatvaryingrates,usuallyquiterapidlyduringtheearlystagesandmoreslowlyattheendoflongperiodsofexposure.Differentkindsofplasticsalsodonotbehavesimilarly.Itisthereforefrequentlyfoundthatvariousplasticmoldingswilloccupydifferentorderswhenratedaccordingtoshrinkage,dependingonwhethertheexposureperiodhasbeenshortorlong.Forpurposesofcontrolwork,shortexposureperiodswiliusuallysuffcefoindicateshrinkagedifferencesamongdifferentbatchesofthesamematerial.Exposureperiodsofgreaterdurationwillmorenearlyreflectrealdifferencesinshrinkagephenomena,incomparingunlikematerialsforsuitabilityinparticularapplicatio...
