# Aluminium and Caustic soda

Their prices have moved together.

Source page: https://www.materialinsights.org/links/aluminium-and-caustic-soda/

[Aluminium](https://www.materialinsights.org/commodities/aluminum/) (commodity) and [Caustic soda](https://www.materialinsights.org/chemicals/caustic_soda/) (chemical): 1 relationship.

## How they are linked

### 1. Price link: refining input

*Cost and price · Weak · Both ways*

Bauxite is refined into alumina with hot caustic soda in the Bayer process, so caustic prices affect alumina costs. The chemical is a minor cost next to power, and the proxy is a broad US alkalis index, so correlation is slightly negative (-0.14 monthly).

- **-0.14** monthly change correlation
- **-0.20** 12-month change correlation
- **0.23** fitted elasticity

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