The Specialty Chemicals Market Volume Index, a new tool created by the American Chemistry Council (ACC), began the third quarter on a stable note. This follows steady monthly declines since December as weakness in oilfield chemicals and a few other segments weighed on overall volumes. Of the twenty-eight specialty chemical segments included in the index, sixteen expanded in July, nine declined and three were flat.   The overall specialty chemicals volume index was off 0.1 percent year-over-year ...