Published: Jan 1991
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The effects of trace organic components on the thermal stability of fuels have been demonstrated in previous chapters. This chapter will deal with materials which exert effects at much lower concentrations, parts per billion (ppb) rather than parts per million (ppm). Metals dissolved in jet fuel are effective at these low concentrations because they are acting as catalysts for one or more of the chemical reactions involved in the sequence of insolubles formation. Metals are a fact of life for jet fuels, however, since refinery equipment, transportation equipment, storage tanks, and aircraft fuel systems are constructed from metals. In many cases the metals are chosen for these uses on the basis of material properties and economy rather than possible degradation of thermal oxidation stability or other important fuel properties.