In general, the disposable mask shall be replaced once every 8 hours and shall not be reused. Disposable mask is made of more than three layers of non-woven fabric; the nose is made of environmental friendly plastic strip, free of any metal, with ventilation and comfort, especially suitable for electronic factories and daily life. The disposable medical surgical mask can prevent respiratory tract infection to a certain extent. It is made of two layers of non-woven fabric and filter paper. It is made of two layers of fiber non-woven fabric which are used for medical and health care. In the middle, a layer of filter and anti bacteria filter cloth is added and welded by ultrasonic wave.
　　
　　We need to remind you that there are various kinds of disposable masks, which must be selected according to different operation requirements and working conditions. For example, during the epidemic, we must select medical surgical masks, and pay attention to the correct wearing methods. First, wash hands before wearing masks. When wearing, hold the ear rope with both hands. The dark side is inside the light one. Put one side of the mask with wire (a small piece of hard wire) on the nose, pinch the wire according to the shape of your nose, and then pull the mask body down completely, so that the mask completely covers your mouth and nose. In addition, such masks shall be used within the validity period, only for one-time use, and shall be destroyed after use; if the mask package is damaged, it shall not be used.