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Proven to inactivate 99.99% of tested strains on five minutes of contact with the surface.
Shown to be effective against seasonal A and B influenza, Pandemic H1N1, H2N2, Avian, Duck, Swine, and Equine flu strains.
According to the packaging, they use two mechanisms for deactivating a virus.
1. An outer layer coated with a 2% solution of citric acid to reduce pH levels
2. An inner layer treated with metal ions (copper 1.6% and zing 1.6%) which form ionic bonds with negatively-charged side groups on influenza viruses
A painter's dust mask might do little to nothing.
But there are some types that are specifically designed to prevent the wearer from receiving infection.