Designation:D4446/D4446M−13StandardTestMethodforAnti-SwellingEffectivenessofWater-RepellentFormulationsandDifferentialSwellingofUntreatedWoodWhenExposedtoLiquidWaterEnvironments1ThisstandardisissuedunderthefixeddesignationD4446/D4446M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodisdesignedtoevaluatetheeffective-nessofwater-repellentcompositionsforretardingdimensionalchangesincoatedwoodsubmergedinwater.Itcanalsobeusedtomeasurethedifferentialswellingofuntreatedwoodwhenexposedtoliquidwaterenvironments.Thecompositionstestedaredesignedtobemixeduntiluniformandappliedbybrush,roller,diporspraytoanexteriorwoodsurface.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.SummaryofMethod2.1Woodsamplesintheformofelongatedslatsthatrepresentthetimberspeciesorproduct/treatmentcombinationtobeevaluatedareexposedinsoakcontainers.Theelongatedslatsareimmersedinthewater-repellentformulation,condi-tionedwithappropriateweighing,thensubjectedtoimmersionindistilledwaterforaprescribedperiod.Theuntreatedslatsomittheimmersioninthewater-repellentformulation.Theswellingresultingfromimmersionfortheselectedtimeperiodisdeterminedbyreadingadialgagecalibratedinincrementsof0.025mm[0.001in.].2.2Awaterrepellentefficiencyof60%isrequiredtopassthistest.3.SignificanceandUse3.1Thistestmethodisusefulindeterminingtherelativean...
