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, <br /> . (`` r` ' <br /> , � "n5°"�"� TE�'HIVICAVGENERAL INFORMATION LETTER No: TD-16;[A] <br /> I�� PlHeburph Cominy Corpontlon <br /> !00 �n�qu� Itl� Drlw, Pltttburph, PA 16239 DATE t May 27, 1981 <br /> Phuna ,12 327•E100 <br /> T0: Architectural Representatives <br /> and Manufacturer's Representattves <br /> Regional Mai�agers <br /> SUBJELT: Glass Black Fire Ratings <br /> This letter should clear up mueh of the m(sunderstanAing and misinformation <br /> deal �ng wtth the fire ratings we have for Glass Biock. We currently have o�ly <br /> one fire ratfng; that bning a 45 minute rating on s window assembl . <br /> There is a big difference between the ftre test of window assemblies ana fire <br /> test of building construction and materfals (walls and partttions) . The tables <br /> below illustrate the dffferences: <br /> Condition Window Assembly Walls and Partitions <br /> i <br /> Fire Endurance 45 mi�. up to 9 hours <br /> Nose Stream 30 psi for 1-1/2 min. up to 45 psi for 6 mfn. <br /> Temperature on not measured measured by attached <br /> Unexposed Surface thermocouples <br /> Crfteria for Passing <br /> Fire Endurance 70$ of the blocks with- no through openfngs* <br /> out through openingsn <br /> Hose Stream 70t of the blocks with- no through opentngs+� <br /> out through openings* <br /> Temperature on not measured average tempera[ure less <br /> Unexposed Surface tha� 250°F above ambient <br /> * Pfnholes through both sides of the block constitute a through opentng. <br /> The dtfficulty In achleving a one-hour rating is due to the hlgh transmission <br /> of radiant heat. Glass Block's high percentage of Iight transmtssion is a <br /> detrement in the ffre test. Records from early tests show that the unexposed <br /> surface temperature criterfa wtll be exceeded within IS minutes. VISTABRIKm <br /> soltd glass brlck, though better than hollow block, wfll fall this portton of <br /> the test wtthin 45 minutes. I <br />