Peracetic Acid FAQs

Hydrogen Peroxide FAQs - Expert Answers

Peracetic acid (PAA) is a widely used oxidizing agent for disinfection and hygiene control in applications such as water treatment, food processing, and pharmaceutical manufacturing. It is valued for its broad antimicrobial efficacy and its ability to decompose into acetic acid, oxygen, and water, leaving no persistent residues.

This FAQ section addresses the most common questions about peracetic acid, including its chemical properties, typical application areas, handling requirements, and regulatory aspects. The information is intended to support technical evaluation and practical use in industrial and institutional settings.

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What is peracetic acid?

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Peracetic acid is not only peracetic acid and water. It can exist only as a chemical equilibrium consisting of peracetic acid, hydrogen peroxide, acetic acid and water. Commercial grades of peracetic acid are always equilibrium peracetic acid.

Most of our peracetic acid grades especially those used for disinfection do not burn. However, peracetic acid is classified as an oxidizer and it may cause fire when it comes into contact with combustible material.

Peracetic acid can be diluted with water in any ratio. However, diluted solutions should be used directly because after dilution hydrolysis and decomposition start. Diluted solutions of peracetic acid are neither storable nor transportable.

Peracetic acid can be analyzed by a two step titration showing the content of peracetic acid as well as hydrogen peroxide. For small amounts of PAA test stripes are available on the market.

Always use plenty of water.

Although our products have an extended shelflife there is always a slight decrease of content over time. Products stored over a long time should be analyzed before use and dosing rates should be adapted accordingly. Inspect containers before use.

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