Humic acid coating process 99.9% of medical disposable masks filtered virus 2022/12/19Con... Humic acid coating process View details
Sulfur coating process 99.9% of medical disposable masks filtered virus 2022/12/19Control... Sulfur coating process View details
Urea formaldehyde coating process 99.9% of medical disposable masks filtered virus 2022/1... Urea formaldehyde coating process View details
Polyurethane coating process 99.9% of medical disposable masks filtered virus 2022/12/19C... Polyurethane coating process View details
Resin coating process 99.9% of medical disposable masks filtered virus 2022/12/19Controll... Resin coating process View details