Can n95 masks be used after they expire?

Filter cotton above N95 uses high-static filter cotton. As long as it is sealed, there is no warranty period. For such products in China, it is mandatory for companies to indicate 3 years. Electrostatic adsorption-tiny objects without static electricity when they are close to objects with static electricity, due to the phenomenon of electrostatic induction, the end close to the objects with static electricity will induce the opposite electrical properties of the objects with static electricity, and will be attracted and attached to the objects with static electricity phenomenon.

Electrostatic filter cotton is a filter cotton that uses the principle of electrostatic adsorption. Compared with traditional mechanical filtration, electrostatic filter cotton has higher filtration efficiency and can better absorb ultra-microscopic dust. KN95-100 dust masks use mostly electrostatically adsorbed filter cotton, which not only has higher filtration efficiency, but also has better resistance, so that breathing is smoother and the dust holding rate is higher. It should not be exposed to damp or water, because once the electrostatic filter is cleaned, it will release static electricity, which becomes a common mechanical barrier principle, which will greatly reduce the protective effect. Once the breathing resistance increases or the service life is reached, please replace the new filter cotton in time.