# Caustic soda: Relationships

Source page: https://www.materialinsights.org/chemicals/caustic_soda/links/

Every element and industry that Caustic soda is linked to, and how. Each pair has its own card explaining the relationships between the two.

- [Chlorine](https://www.materialinsights.org/links/caustic-soda-and-chlorine/): Chlorine and caustic soda come out of the same brine electrolysis in a fixed ratio of about 1.1 t of caustic per tonne of chlorine, so neither can be made alone. Plants run for whichever product is in demand and the other's price absorbs the imbalance; electricity is the largest cost of both. *(researched)*
- [Salt](https://www.materialinsights.org/links/caustic-soda-and-salt/): Caustic soda is made by passing electricity through salt brine, so each tonne needs roughly one and a half tonnes of salt, but salt is cheap and power is not. The link that matters is physical and geographic: salt quality for membrane cells and access to coastal salt, which is why India's chlor-alkali industry clusters in Gujarat. *(researched)*
- [Paper and packaging](https://www.materialinsights.org/links/caustic-soda-and-paper-and-packaging/): Caustic soda is one of the two active chemicals in kraft pulping liquor; mills recover most of it but must buy make-up, about 35 kg per tonne of market pulp, so virgin-fibre pulp is a steady caustic buyer whose supply depends on chlorine and PVC demand. In India, where three quarters of paper is made from recycled fibre, paper takes only about 6% of caustic demand. *(researched)*
- [Aluminium](https://www.materialinsights.org/links/aluminium-and-caustic-soda/): Their prices have moved together.
- [Energy-intensive industry](https://www.materialinsights.org/links/caustic-soda-and-energy-intensive-industry/): Their prices have moved together.
- [Fatty acids](https://www.materialinsights.org/links/caustic-soda-and-fatty-acids/): Their prices have moved together.
- [Food and beverage processing](https://www.materialinsights.org/links/caustic-soda-and-food-and-beverage-processing/): Food and beverage processing depends on caustic soda.
- [Household and personal care](https://www.materialinsights.org/links/caustic-soda-and-household-and-personal-care/): Household and personal care depends on caustic soda.
- [Hydrogen peroxide](https://www.materialinsights.org/links/caustic-soda-and-hydrogen-peroxide/): Their prices have moved together.
- [Metal products](https://www.materialinsights.org/links/caustic-soda-and-metal-products/): Metal products depends on caustic soda.
- [Metal-air batteries](https://www.materialinsights.org/links/caustic-soda-and-metal-air-batteries/): Their prices have moved together.
- [Nickel-based batteries](https://www.materialinsights.org/links/caustic-soda-and-nickel-based-batteries/): Their prices have moved together.
- [Other and primary batteries](https://www.materialinsights.org/links/caustic-soda-and-other-and-primary-batteries/): Their prices have moved together.
- [PVC](https://www.materialinsights.org/links/caustic-soda-and-pvc/): Their prices have moved together.
- [Plastic and rubber products](https://www.materialinsights.org/links/caustic-soda-and-plastic-and-rubber-products/): Plastic and rubber products depends on caustic soda.
- [Textiles and leather](https://www.materialinsights.org/links/caustic-soda-and-textiles-and-leather/): Textiles and leather depends on caustic soda.
- [Waste and recycling](https://www.materialinsights.org/links/caustic-soda-and-waste-and-recycling/): Waste and recycling depends on caustic soda.
- [Water and sanitation](https://www.materialinsights.org/links/caustic-soda-and-water-and-sanitation/): Water and sanitation depends on caustic soda.

## Other sections

- [Summary](https://www.materialinsights.org/chemicals/caustic_soda/index.md)
- [Overview](https://www.materialinsights.org/chemicals/caustic_soda/overview/index.md)
- [Correlation](https://www.materialinsights.org/chemicals/caustic_soda/correlation/index.md)
- [Production route](https://www.materialinsights.org/chemicals/caustic_soda/routes/index.md)
- [Production](https://www.materialinsights.org/chemicals/caustic_soda/production/index.md)
- [Feedstocks](https://www.materialinsights.org/chemicals/caustic_soda/feedstocks/index.md)
- [Cycles](https://www.materialinsights.org/chemicals/caustic_soda/cycles/index.md)
- [Trading](https://www.materialinsights.org/chemicals/caustic_soda/trading/index.md)
- [Movement](https://www.materialinsights.org/chemicals/caustic_soda/movement/index.md)
- [Regulation](https://www.materialinsights.org/chemicals/caustic_soda/regulation/index.md)
- [Characteristics](https://www.materialinsights.org/chemicals/caustic_soda/characteristics/index.md)
- [Emissions](https://www.materialinsights.org/chemicals/caustic_soda/emissions/index.md)