1, metal bar distinction. Generally, the metal strip is on it, with the protruding side outside and the opposite side inside.
2, crease distinction, crease upward side is the inside, and vice versa.
3, color distinction, the front and back colors of the mask are different, the outer layer is mostly light blue or dark, and the inner layer is mostly white or light.
4, fabric differentiation, according to the smoothness, the outer layer of the mask has waterproof function, mostly smooth, while the inner layer is made of breathable material, which is close to the skin, which is conducive to breathing and covers more delicately and comfortably.
Precautions for wearing a mask:
1, wash your hands before wearing a mask.
2. When wearing the disposable medical mask, unfold the folded face completely, wrap the mouth, nose and jaw completely, and then press the nose clip to make the mask fit the face completely.
3. Try not to touch the mask after wearing it. If you must touch, remember to wash your hands before and after touching.
4. When taking off the mask, try not to touch the outside of the mask, and remember to wash your hands immediately after taking off the mask.
Extended data
Pay attention to buying masks.
1, no need to choose professional protective masks.
You don't need to wear professional protective masks such as N95 and N99 to filter PM2.5. Theoretically, the more airtight the protective material of the mask is, the better the effect of blocking particles is.
On the contrary, the more airtight the mask is, the more obvious the increase in respiratory resistance is, and the more difficult it is to breathe. Wearing professional protective masks such as N95 and N99 requires training, otherwise it will easily lead to dyspnea and dizziness due to lack of oxygen.
Step 2 buy an ordinary mask
At present, there is no national standard for civil masks, and the quality of masks on the market is mixed. Be sure to choose masks with big brands and formal product packaging and instructions, such as disposable medical surgical masks or gauze masks with more than 12 layers. Don't be greedy and cheap, buy masks at stalls without health permits.