Method | Treatment level | Fitting performance | Filtration performance | Antimicrobial performance |
---|---|---|---|---|
Vaporous hydrogen peroxide (VHP) | Usually use commercial hydrogen peroxide steam generator. Directly use VHP to treat the surface of the mask, generally 10–30 min. | Passed (Fitting unaffected for up to 20 cycles) | Passed | Can be maintained (> 99.99%) |
Ultraviolet germicidal irradiation (UVGI) | Ultraviolet germicidal irradiation to treat the surface of the mask. 0.5–950 J/cm2 were used | depending on model (90–100% can pass) | Passed | Can be maintained (99.9% for all tested viruses) |
Microwave generated steam | microwave models: 1100–1250 W 40 s treatment for 2 min | 95–100% Passed | Passed, even after 20 cycles | Can be maintained |
Microwave steam bags | microwave models: 1100Â W, 90Â s treatment, 60Â mL tap water was filled in the bags | Not evaluated | Passed | Can be maintained |
Moist heat (MH) incubation | 15–30 min treatment at 60 °C | Passed | Passed | Can be maintained |
Liquid hydrogen peroxide | 1 s to 30 min treatment with Liquid hydrogen peroxide concentration of 3–6% | Not evaluated | Passed | Not evaluated |
Ethylene oxide | 1 h at 55 °C; conc. range: 725–833 mg/L | Not evaluated | Passed | Not evaluated |