It has always been difficult to locate current bulk prices for industrial chemicals, but in recent years the task has become even more challenging as trade journals have reduced the number of chemicals they cover on a regular basis.
Current bulk chemical prices can be estimated by adjusting older chemical prices to current levels using a Producer Price Index (PPI). The Federal Reserve Bank of St. Louis lists a number of Producer Price Indices for Chemicals and Allied Products.
Updated Price = Older Price x [(Cost Index at Newer Date) / (Cost Index at Older Date)]