1. Metal distinction

It is distinguished by metal strips. Usually, the color of medical masks is mostly the same. Generally, the metal strip is on the upper side and protrudes to the outside-the outside is on the outside, and the opposite side is on the inside.

2. Differentiation of creases

It is distinguished by the crease, the side with the crease upward is the inner surface, and the opposite is the outer surface.

3. Distinguish between thread ends

The side with the thread is the outside, and the side without the thread is the opposite.

4. Color distinction

The colors of the front and back of the mask are mostly different, the outer surface is mostly light blue or dark; the inner layer is mostly colored or light.

5. Fabric differentiation

According to the degree of smoothness, the outward part of the mask is mostly smooth because of its water blocking function. However, Chaoli usually chooses a material with good air permeability, which is close to the skin and is good for breathing.

Summary:

1. Distinguish between metal strips. Generally, the metal bar is on the top and the side protruding to the outside is the outside, and the opposite is the inside.

2. Differentiation of creases. The side with the crease upward is the inner face, and the opposite is the outer face.

3. Distinguish between thread ends. The side with thread ends is the outside, and the side without threads is the reverse side.

4. Color distinction. The outer surface layer is mostly light blue or dark, and the inner layer is mostly white or light color.

5. Fabric distinction. The face of the mask is mostly smooth, and the face is made of a material with good air permeability, which is close to the skin and is good for breathing.