Short answer
Yes, peracetic acid is a potent disinfectant that kills bacteria, viruses, fungi and spores, and it decomposes into harmless by‑products.
Key points
- Effective against a broad range of pathogens, including spores
- Works at low concentrations and across a wide pH range
- Breaks down to water, oxygen and acetic acid, leaving no toxic residue
- Corrosive to metals and can irritate skin and eyes
- Common in food processing, medical instrument sterilisation and wastewater treatment
Peracetic acid (PAA) is a powerful disinfectant used in many industries for its broad antimicrobial activity and environmentally friendly breakdown products.
How it works
PAA is formed by mixing acetic acid with hydrogen peroxide. The resulting oxidising agent attacks cell walls, proteins and nucleic acids, destroying bacteria, viruses, fungi and even bacterial spores. It remains active at low concentrations and over a wide pH range.
Advantages and safety considerations
When it decomposes, PAA yields only water, oxygen and a small amount of acetic acid, so it does not leave harmful residues like chlorine‑based cleaners. This makes it popular for sanitising food‑contact surfaces, medical devices that cannot withstand high heat, and wastewater streams.
However, PAA is corrosive to many metals and can cause skin, eye or respiratory irritation if not handled with proper protective equipment. Adequate ventilation and compatible materials are essential for safe use.
Typical applications
- Sanitising equipment and surfaces in food processing plants
- Low‑temperature sterilisation of endoscopes and other delicate medical tools
- Disinfection of water and wastewater treatment systems
Frequently asked questions
Can peracetic acid be used on all surfaces?
It works on many non‑porous surfaces, but it can corrode metals and damage some plastics, so material compatibility should be checked first.
Is peracetic acid safe for food contact?
Yes, because it breaks down to water, oxygen and a small amount of acetic acid, leaving no toxic residues on food or equipment.
How does peracetic acid compare to chlorine bleach?
Both are strong oxidisers, but PAA decomposes into harmless by‑products, while chlorine can form irritating chlorinated compounds.
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