FRED - Producer Price Indexes (PPI) for Chemicals and Allied Products
Use this Producer Price Index resource to adjust for older chemical prices
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)]