Here are some useful resources:
Digital platform maintained by an Indian company, whose mission is to monitor fluctuations in the chemical and petrochemical markets in real time, enabling its customers to make informed strategic decisions. For over 400 products, ChemAnalyst offers market analyses, in-depth evaluations based on more than 15 criteria, and forecasts for the next 10 years.
The Premium version is required to access the full range of features, but the free version can also provide a few insights.
Example: the price page for sulfuric acid:
Current prices for products or equipment can be estimated by adjusting older prices to current levels using a Producer Price Index (PPI). As publicly available prices are often several years old, it is necessary to update them before using them in an estimate.
To this end, a formula can be used :
Updated price = Older price x [(Index at most recent date) / (Index at oldest date)].
Here are a few PPIs that could be used for this calculation: