How Nelson-Farrar indexes of chemical costs have changed

07/05/1999
The costs of two important chemicals used in crude-oil refining changed very little during the period, 1996-1998, while the costs of three others dropped significantly. Click here to enlarge imageThe two stable chemicals were hydrofluoric acid, with Nelson-Farrar index ending with 414.9; and sulfuric acid with an index constant of 347.4.Platinum varied from 413.2 in the first quarter of 1996, to 332.6 in the last quarter of 1998. However, the average for the year of 1996 was 395.8 while 366.8 was the average for 1998.The other two chemicals with dropping costs are sodium carbonate and sodium hydroxide.Over the 1996-1998 time span, sodium carbonate showed a maximum index value of 419.3 an...
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