In the current market, there are many kinds of masks and various colors, which brings some people confusion, that is, they don't know how to distinguish the front and the back of masks. In this regard, let me solve your doubts.

How to distinguish the front and back of the mask

The mask is divided into three layers. If you wear the mask correctly, it will lose its protective effect. If you want to distinguish the front and the back of the mask, you can judge by the color, dark color is the outside, white (light color) is inside; you can also judge by printing, and the printing is on the outside; finally, you can also judge by the material, the smooth and hard is the outside, and the soft is the inside.

1. Color: there are many colors of the mask, but the dark one is the outside, and the white or light color is the inside, because white looks more safe, and white is not resistant to dirt;

2. Printing: some masks will be printed with logo in order to highlight the brand. It is easy to judge. The printing with logo or brand name is outside;

3. Fabric: the outer layer of mask has waterproof function, mostly smooth surface, and has obvious lattice, which looks a little tough; the inner layer of mask is water absorption, which has a soft fabric feeling.

4. Metal strip: many masks have metal strips, and the ones with metal strips are on them, because the metal strips can be used to adjust and fit the nose. In addition, the side of the metal strip protruding outward is the outside, and the opposite side is inside.

Classification of masks

① Ordinary gauze mask: the most common mask in life, which can be bought in supermarkets, online and drugstores, is also what we often call disposable masks.

② Medical mask: don't buy it online. It is usually sold in regular drugstores. This kind of mask can prevent lampblack.

③ Daily protective mask: professional, mainly used to prevent haze, commonly used by Beijing residents.

④ Dust mask: it is mainly used to prevent dust, smoke, fog and microorganism. It is divided into kn100, kn95 and Kn90 grades. Kn100 grade can effectively prevent the superfine dust rate of more than 99.97%. The mask is more professional and has better anti haze effect.

⑤ Oil fume mask: it is mainly used to prevent oil fume and oil mist, as well as dust, smoke, fog and microorganism. It is divided into kp100, kp95 and kp90 grades. Kp100 grade can effectively prevent the superfine dust rate of more than 99.97%.