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sodium hydroxide molecule

Sodium Hydroxide

Also known as:

  • Caustic soda
  • Lye
  • Soda lye
  • Sodium hydrate
The Science

Why CPVC Works Well With Sodium Hydroxide

High-quality CPVC like Corzan® CPVC has a high level of chlorine on the polymer chain. This protects the CPVC from the degrading effects of highly corrosive chemicals commonly used by industrial plants for everything from metal extraction to pH adjustment to the manufacture of other important industrial chemicals. Corzan CPVC has excellent resistance to caustic soda due to its superior engineering and formulation.

Temperature & Concentration

Corzan CPVC's Resistance to Sodium Hydroxide

For 30 years, Corzan CPVC has been chosen as a chemical barrier material for the transport of hot, caustic chemicals in industries like pulp and paper processing and wastewater treatment because of its consistent reliability and its backing by expert advice and research. Corzan CPVC samples were tested in 50% sodium hydroxide environments in laboratory tests that have shown good resistance of the material up to approximately 180°F (82°C)*. 

corzan cpvc chemical resistance to sodium hydroxide chart

* Corzan® Material and Piping Solutions only partners with manufacturers with a proven track record of quality and reliability. These manufacturers are carefully chosen to convert Corzan CPVC into the high-performance piping systems, ducting, sheets and lining and more that customers rely on. Always confirm any planned application is in compliance with our partner’s design guidelines.

Drawbacks of Other Materials

The Drawbacks of Other Materials Handling Sodium Hydroxide

Sodium hydroxide is among the most common chemicals that Corzan CPVC reliably handles in a variety industrial applications. All material will react to sodium hydroxide in different ways according to concentration levels, temperatures, pressures and nature of the material. But engineers choose Corzan CPVC for sodium hydroxide due to its performance capabilities compared to metals and other plastics.

Metals: Metals like stainless steel or carbon steel can have very short service lives when processing or storing caustic soda due to its highly corrosive nature.

PVC (Polyvinyl chloride): PVC has far lower operating temperatures and pressure limits than CPVC which limits its usefulness in many industrial applications. 

Common Uses

Common Uses of Sodium Hydroxide

  • Pulp and paper industry for pulping and bleaching processes.
  • Wastewater treatment industry for pH neutralization and wet-air scrubbers.
  • Power generation industry for regenerating ion demineralization resin beds.
  • Semiconductor industry for etching, plating acid neutralization and cleaning.
  • Production of potassium carbonate, potassium phosphate and liquid fertilizer
  • Food and beverage industry as a cleaning agent.
  • Personal care industry, such as soapmaking.
  • Aluminum processing applications for dissolving compounds and extracting impurities.

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