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21Premiere™SeriesGlassBlock•Offersa45-minutefireratingclassifiedbyULstandardsinallpatternsandsizesSTClevelsrangefrom35-41dependingonthestyleofblockandsizeofglassblockchosen•PatternsincludeArcticCortinaClarityCrossRibbedLightDiffusingNubioRegentThickset®60SeriesGlassBlock•Offersa60-minutefireratingclassifiedbyULstandardsinallpatternsandsizesThisthickerfacedglassblockhasanSTClevelof48andfacethicknessof375•PatternsincludeClarityNubioSprayThickset®90SeriesGlassBlock•Offersa90-minutefireratingclassifiedbyULstandardsinallpatternsandsizesThisthickerfacedglassblockhasanSTClevelof50andfacethicknessof75•PatternsincludeClarityNubioEndura1919/13F-120Thisglassblockisavailablein7-1/2squareandisEuropeantestedfor120minutesItmeetstheEuropeanequivalentofanASTME119WallRatingof120minutesTestingforthisblockintheUnitedStatesisunderwayHollowGlassBlockOptionsLearnmoreaboutourFire-RatedGlassBlockwindowassemblies
