What metals does peracetic acid dissolve?

Peracetic Acid and Its Effects on Metals

Peracetic acid is a powerful disinfectant widely used in healthcare settings for sterilising medical instruments. One prominent example is the STERIS System 1E, which utilises a solution of peracetic acid diluted in sterile water to achieve rapid sterilisation—typically within 20 to 30 minutes. This efficiency makes it a valuable tool in high-turnover clinical environments.

However, despite its effectiveness, peracetic acid has a notable downside: it can be corrosive to certain metals. Copper, brass, and bronze are particularly vulnerable, as they react with the acid over time, leading to tarnishing or degradation. Similarly, steel and galvanised iron can suffer from corrosion when exposed to the solution, especially during repeated use. This not only compromises the integrity of metal instruments but may also affect performance and lifespan.

To counteract these effects, manufacturers often blend peracetic acid solutions with corrosion inhibitors or other stabilising additives. These components help protect sensitive materials without sacrificing the sterilising power of the acid. In systems like the STERIS 1E, such formulations are essential to safely accommodate a range of instruments, including those made from or containing reactive metals.

For healthcare facilities, understanding the compatibility of sterilisation chemicals with instrument materials is crucial. While peracetic acid offers speed and efficacy, its use requires careful consideration of metal composition to avoid damage. Proper maintenance, adherence to manufacturer guidelines, and the use of protective additives ensure both patient safety and equipment longevity.