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Nelson-Farrar Quarterly Costimating: How Nelson-Farrar indexes of chemical costs have changed

07/02/2007
Gary Farrar, Contributing EditorThe costs of two important chemicals used in crude refining changed very little during 2004-06, while the costs of three others varied significantly. Click here to enlarge imageThe two stable chemicals were hydrofluoric acid with an index constant of 414.9 and sulfuric acid with an index average of 397.4.Sodium hydroxide ended with 644.9 in fourth-quarter 2006, rising from 529.6 in first-quarter 2004.Platinum rose significantly to 1,466.4 in the last quarter of 2006 from 762.1 during first-quarter 2004. However, the average for 2004 was 762.1, while 1,344.4 was the average for 2006. Click here to enlarge imageSodium carbonate rose to 470.5 in fourth-quart...
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