Generally speaking, the large deviation of the size of disposable medical masks should not exceed +5%, and the length of disposable medical masks should not be less than 8.0cm, and the nose clip is made of plastic. Precautions for wearing a mask (wash hands before wearing a mask and before and after taking off the mask):
1. Make the mask close to the face:
(1) The colored side of the mask faces outward, and the side with the metal sheet faces up;
(2) Tighten the rope that fixes the mask, or wrap the rubber band of the mask around the ears to make the mask close to the face;
(3) The mask should completely cover the mouth, nose and chin;
(4) Press the metal sheet on the mask along the bridge of the nose to make the mask close to the face.
2. After wearing a mask, avoid touching the mask so as not to play a protective role; if you need to touch the mask, please wash your hands before and after touching the mask.
3. When taking off the mask, try to avoid touching the outer layer of the mask, because this part may have been infected with germs.
4. After taking off the mask, wrap it in tape or paper bag, then put it in a covered trash can and set it aside.
5. Surgical masks should be changed daily. If the mask is damaged or soiled, it should be replaced immediately.
