Why Mask made of Korea KF94? Why Korea Government let people keep and wear mask against this Pandemic Disaster as a rule and order?
Sample was inspected and if you use some different brand, please cut the piece and check up inside main filter sheet is not same as face sheet !!!!!!! And long term inventory can reduce the filtering performance because of natural discharge of vortex applied into mask filter sheet !!!!!!
Filter Sheet is different material and structure from face sheet.