# Hydrochloric acid and Polyurethanes (MDI, TDI, polyols)

Their prices have moved together.

Source page: https://www.materialinsights.org/links/hydrochloric-acid-and-polyurethanes-mdi-tdi-polyols/

[Hydrochloric acid](https://www.materialinsights.org/chemicals/hydrochloric_acid/) (chemical) and [Polyurethanes (MDI, TDI, polyols)](https://www.materialinsights.org/chemicals/polyurethanes/) (chemical): 1 relationship.

## How they are linked

### 1. Price link: by-product source

*Cost and price · Strong · Both ways*

Making MDI and TDI for polyurethanes releases large amounts of hydrochloric acid, so strong foam demand floods the acid market. Monthly moves correlate at 0.24 and yearly moves at 0.71, mostly a shared chemical cycle.

- **0.24** monthly change correlation
- **0.71** 12-month change correlation
- **1.56** fitted elasticity

Built from the site data on production routes, energy flows, industry value chains, input-output tables and prices.