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hydrochloric acid molecule

Hydrochloric Acid

Also known as:

  • Spirits of Salt
  • Acidum Salis
  • Marine Acid air
  • Muriatic Acid
The Science

Why CPVC Works Well With Hydrochloric Acid

High-quality CPVC like Corzan® CPVC has a high level of chlorine in the polymer chain. This protects the CPVC from the degrading effects of highly corrosive acids, like hydrochloric acid, commonly used by industrial plants for everything from pH adjustment to the manufacture of other important industrial chemicals. Within safe operating temperatures, Corzan CPVC has excellent resistance to hydrochloric acid due to its superior engineering and formulation.

CPVC resists material degradation and corrosion when handling hydrochloric acid far better than metals, but these still can occur over time. The severity general degradation will be contingent on things like: temperature, pressure, and acid concentration.  

Temperature & Concentration

Corzan CPVC's Resistance to Hydrochloric Acid

In hydrochloric acid applications, CPVC compound and product quality matter, especially as the heat and acid concentration rise. Corzan CPVC’s superior compound and quality assurance make it the premier CPVC material, delivering excellent resistance to hydrochloric acid in industrial applications like ion exchange regeneration, processing additives like fructose and citric acid for use in the food industry, and ferric acid production for water treatment*.

corzan cpvc chemical resistance to hydrochloric acid 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 Hydrochloric Acid

Hydrochloric acid is among the topmost common chemicals that Corzan CPVC reliably handles in industrial applications. Engineers choose Corzan CPVC for hydrochloric acid due to its performance capabilities compared to metals and other plastics. 

Common Metals: Because of its strong reduction properties, metals such as carbon steel and copper will suffer rapid attack from HCl at all concentrations and temperatures.

Stainless steel: Corrosion is one of the costliest issues facing plants that handle hydrochloric acid. It causes general corrosion, pitting and stress-corrosion cracking of austenitic stainless steel, such as 316. In fact, 300-series stainless steels can even be attacked by diluted HCl. Although there may be low-concentration and low-temperature combinations that are acceptable in some specific cases, 316 stainless steel is not recommended when hydrochloric acid is present.

PVDF (Polyvinylidene fluoride) and PVDF lined pipe: PVDF has outstanding acid resistance, but it is a prohibitively expensive alternative to CPVC.

PVC (Polyvinyl chloride): PVC’s polymer chain is not reinforced with the extra chlorine atoms as CPVC. It is thus only reliable for use with low concentrations of hydrochloric acid.

Common Uses

Common Uses of Hydrochloric Acid

  • Fertilizers
  • Chlor-Alakli 
  • Pharmaceuticals
  • Explosives
  • Detergents
  • Inorganic salts and acids
  • Petroleum refining
  • Metallurgical processes


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For long-term system reliability, it is critical to choose a material that resists corrosion. Corzan CPVC effectively stands up to most acids, bases and salts and is innately resistant to corrosive chemicals, including the 10 commonly used chemicals that can degrade and reduce the service life of many metals.