A medical mask
should have 3 layers. You can judge from the appearance, standard number, and the qualification of the manufacturer. First of all, the words "medical surgical mask
" must be written on the outside of the package. Many Taobao stores claim to be medical surgical masks
, but on the packaging Dare not write.
Then, there are national standards for medical surgical masks. Look for the standard number: YY0469-2011, which is usually on the mask packaging, and some are in the upper right corner.