Qualified masks can absorb a lot of paper dust! True and false masks teach you to distinguish between true and false

Masks are divided into three categories, including disposable medical masks, medical surgical masks and medical protective masks.

What does the unqualified mask look like? ↓↓

▲ These false masks do not have an intermediate core material and do not block particles and bacteria.

Masks are generally composed of melt-blown fabric, non-woven fabric, mask band, and nose clip, in which the outer layer and the inner layer are made of non-woven fabric, and the middle layer is made of melt-blown fabric.

"Melt-blown cloth", commonly known as the "heart" of the mask, is the filter layer in the middle of the mask, which has good filterability, shielding, heat insulation and oil absorption. The fake mask is very thin, if there are only two layers inside and outside, and there is no meltblown cloth in the middle, it can not play the role of blocking particles and bacteria.

▲ On the left is a real mask, on the right is a fake mask. The middle layer of the two can be visually distinguished even with the naked eye.

Compared with ordinary masks, the outer layer of medical surgical masks has flame retardant properties, and at the same time must have the performance of preventing blood penetration to ensure the safety of medical personnel.

▲ This green looks like a N95 mask, but it does not meet the requirements of the N95 mask in terms of adhesion.

As shown in the green picture above, this highest-grade medical mask can filter out at least 95% of the particles, penetrate through a tightness test, and see how tight it is after wearing, whether it can fit the face, while breathing , There must be no water and blood.

How do consumers choose qualified masks? ↓↓

First of all, it is necessary to look at the label. The label must be complete and the attributes of the mask must be clearly seen. At the same time, it is necessary to look at the outside of the package to see if there is a production license number issued by the Food and Drug Administration and a registered account number. Pay special attention to the word "machine" on it.

So, what are the general steps to detect masks? Need more time? ↓↓

Mask band detection

Each mask has 4 welding points, and the breaking strength of the connection point between the root of each mask and the mask body should not be less than 10N. Each test lasts 5 seconds.

Mask performance test.

For the test of the tight-fitting mask, ten volunteers are generally needed to see if the nose clip of the mask fits. Volunteers will swing left and right, nodding up and down, etc. to test whether the mask is leaking. The staff put on a medical protective mask and entered the small room to test the tightness of the mask. The closed small room was filled with sodium chloride aerosol.

water-proof test

Use 250 ml of water to drip down. After all the leaks, see the waterproof performance of the mask according to the standard.

Blood barrier performance test

Medical surgical masks and protective masks must be not only waterproof but also blood-proof. The staff will use artificial blood to call from a distance to see if the other side of the mask is seeing through. The main reason why a qualified mask can block blood is the meltblown cloth in the middle.

▲ It can be seen from the comparison that fake and inferior masks lacking key materials in the middle cannot block the blood.

Mask comfort performance test

During the epidemic, people need a lot of protective equipment to protect their health, and the current market supply is in short supply. Many companies that did not produce such products have urgently switched to production. While the institute inspects and checks these newly produced products, it helps a lot Enterprises producing medical masks overcome technical difficulties.