This kind of mask is made of suitable materials with small airflow resistance, synthetic blood barrier, specific strength, filtration efficiency, surface wetting resistance and flame retardant properties. It is self-imbibed and consists of the body of the mask (including nose clip) and the mask belt.
It still acts as a barrier to virus aerosol under the respiratory airflow, and when removed, the outer surface of the mask not contact with human body.
Worn on the face of a person in contact with a viral material in a medical facility to prevent transmission of the virus from a patient to medical personnel.