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AUG-L3-1998 08:3a FRCM PUBL I C HEALTH SERI.=CES TO 9 4 64, 01`8 P.04 <br /> �-_.<-17Qt; IC�:G 1 hi'?L79 l.ti !fi�CUICI"I I CJ +.ur.� C. i IVB♦ .J _i��».��._.vu... - . <br /> LEA Advisory.446 <br /> 'lovetltber 6, 1997 <br /> Page 2 of$ <br /> -'ortnulatioo recipes when producing tires. For specific information on the processing and manufacturing <br /> of tires;efer to the Board's repon Effects Of 4 0sle Tires, Waste Tire Facili(ies. and Waste Tire Pmjecss <br /> an the Envuanr►renr. �" The following tabic liras a typical tirE cUmpositiott. <br /> Typical Tire Ca neon:Pmenger Pre Recipe' <br /> 7, <br /> 46.79% <br /> ,[,J ••QFf. <br /> �}Vfl�1P 46�j9%O <br /> Yea <br /> Carbon black 45.49% <br /> Aromatic oil � 1,74% <br /> Zinc oxide <br /> Stearic acid 94% <br /> i <br /> Antioxidant 6C <br /> Drax 0.23% <br /> Sulfur I-I 7e/a <br /> i <br /> Qctelerator C <br /> 1 � <br /> An autoinobiie tire weighs about.1.0 pounds. with a diameter ranging from 18-30 inchm In addition to <br /> rubber,a Tire contains some steel in the bead and score ra`on or steel in the belt. An average tire is <br /> produced from about 7.5 gallons of Retrofeurn,making it a good source of heat energy. Shredded or <br /> cftipe_ed tires. without t",eir steel bslLI, have an energy content 13n9mg from 14,000 to 15,000 Btu pet <br /> pqu;1d. Coal has an ener�,y content of 3,000 to 1-000 Btu peer gourtd.{t <br /> Proms <br /> When sires am bumed,the rank smell can probably he anribtned to sulfur-bearing compcunds. The <br /> carbon black used in the vulcanization of rubber is tfie source of most of the dark particulate tnarter. "As <br /> d tirc bursvi,twu distinct types of burning appear to occur,during which eini,ssions will difTer. Thest~ <br /> burn patterns correspond to the materials in the tread layers and the bcft 'sayers of the tires."(CTC,1989, <br /> pazze 3`11) Tire combustion occurs at a temperature range of appmximately 100(remote from the flame) <br /> to�OOQ tat the flame front)degrers centigrade Ideal burr.conditions would include actuate time <br /> for mixing of fuel and air,high temperatures,and complete rnixittg 4owcen the fuel and air. The fi= <br /> hum rate.can be affected by the materisf size_ Shredded tires will burn at a much iowar rate than chunk <br /> tires. Small-stale simulation of open burning of tires found the gaps between the tine material provides a <br /> pathway far Oxygen tratnsport and appears to he the controlling meclmnism for sustaining the cambttsttott <br /> �racc35.v�n <br /> Thennaf degradation and oxidation of tires is a func4oa of the Brous cQndwom appLed,acss-14*zgr. <br /> and how the rubber it cured, Degradation bctow'J5VC producca an oily tar. Gaseous C l-CS <br /> hydrocarbons{methane,ethwo,isopropene, buta(iiene,propane)are produced at teutperatures ty?k=ily <br /> between 250°4540C. As the reaction proceeds,various primary products formed in the initial <br />