Sodium perborate (GenAqua) is an oxidative preservative that is used in Genteal lubricating eye drops (Novartis Ophthalmics, East Hanover, NJ). With topical application, sodium perborate is converted by catalase to water, oxygen, and hydrogen peroxide. Its antimicrobial properties are attributed to oxidization of cell membranes, membrane-bound enzymes, and disruption of protein synthesis. Also, sodium perborate has demonstrated efficacy against Aspergillus niger.
White, free-flowing granule
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Its concentration in products varies. According to Chem-OnLine.org, conventional detergents may contain between 8 percent and 15 percent of sodium perborate by weight whereas "compact" detergent powders may contain 10 to 20 percent. Some oxygen bleach powders may contain as much as 80 percent!
Sodium Perborate Tetrahydrate is not regulated as dangerous chemical for transportation, but Sodium Perborate Monohydarte is classified as oxidier and the newly allocated UN number as 3377 (as per IMDG CODE) from July 2003.