Designation:C367/C367M−16StandardTestMethodsforStrengthPropertiesofPrefabricatedArchitecturalAcousticalTileorLay-InCeilingPanels1ThisstandardisissuedunderthefixeddesignationC367/C367M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONMaterialsusedforabsorbingsoundgenerallyhaveaporous,low-densitystructure.Incomparisonwithmanybuildingmaterialstheyarerelativelyfragile.Materialsareavailablethatpossessadequatestrengthandstabilityandatthesametimeprovidegoodsoundabsorption.Thetestmethodsdescribedherecoverproceduresforevaluatingthosephysicalpropertiesrelatedtostrength.Themethodsareofuseindeveloping,manufacturing,andselectingacousticaltileorlay-inpanels.Keepinmindthatapropertyrelatedtostrengthisonlyoneofseveralconsiderationsimportantinjudgingtheusefulnessofanacousticalmaterial.Forexample,amaterialjudgedtobequiteweakbyoneofthesetestsisstilldesiredforotherreasons,andwithadequateprecautions,isshippedandinstalledsuccessfully.1.Scope1.1Thesetestmethodscoverthedeterminationofthestrengthpropertiesofprefabricatedarchitecturalacousticaltileorlay-inceilingpanelsasfollows:TestsSectionsHardness4to9Friability10to16Sag17to23Transversestrength24to301.2Notallofthetestsdescribedinthesetestmethodsarenecessarytoevaluateanyparticularproductforaspecificuse.Ineachinstance,itisnecessarytodeterminewhichpropertiesarerequired.1.3Thesetestmethodsspecifyproceduresthatareusedinproductdevelopment,manufacturingcontrol,specificationacceptance,andserviceevaluation.1.4Propertiesdeterminedbythesetestmethodsreflecttheperformanceofthematerialsunderthespecificconditionsofthetest,anddonotnecessarilyindicateperformanceunderconditionsotherthanthosespecifiedherein.1.5ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemarenotexactequivalents...
