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2.03 SEALING MATERIALS <br />A. Mechanical seals shall be modular, adjustable, bolted, mechanical type consisting of <br />interlocking synthetic rubber links shaped to continuously fill the annular space between <br />the pipe and sleeve. The seal shall be rated by the manufacturer for 40 -feet of head or 20 <br />psig. Mechanical seals shall be Link -Seal, depending on pipe size, by Thunderline Corp., <br />Wayne, MI or equal. <br />B. Sealant shall be a two part foamed silicone elastomer by Dow Corning Co., Product No. <br />3-6548 silicone R.T.V.; 3M brand fire barrier products caulk C.P. 25 and 3M brand putty <br />303; or Flame -Safe fire stop systems Fig. No. FS -500 by Thomas & Betts Corp. Sealant <br />bead configuration, depth and width shall be in accordance with manufacturer's <br />recommendations. <br />C. Caulking for iron, steel and copper piping shall consist of braided oakum packing or fire <br />retardant pliable material, Fig. 310 by Sealtite Co.; White Oakum W.S.-600 by American <br />Manufacturing Co., or equal, followed by poured molten soft virgin lead. Minimum <br />length of leadlsh twith end of sleeve. Coolwhichever or 6 -inch, <br />Lead shall be flush lead shall be expanded with flua caulking <br />iron to form a water seal. <br />D. Caulking for PVC pipe shall meet all the requirements in Paragraph B above except that <br />i—ri wnnl comnacted to form a watertight seal, shall be used in place of molten lead. <br />