The material of the face mask is PP+Melt-blown+PP. New mask is clean, breathable and hygiene.
The face mask is contaminated with foreign objects such as blood stains or droplets if long time.
The user feels that the breathing resistance increases.
The mask will be damaged, usually control 4 hours is best.
Dust filter cotton, when the mask is in good contact with the user’s face, when the user feels that the breathing resistance is very large, it means that the filter cotton is full of dust particles, and a new mask should be replaced.
The anti-virus filter box should be replaced with a new one when the user smells the poison when the mask is in good contact with the user’s face.
Ordinary mask wearing: Activated carbon masks can generally be used for 2 days, and n95 can be used for a week. If the mask is not worn for a long time after cleaning, it is better to re-clean it before wearing it.
