Why can't masks with valves be used? Can masks made of meltblown fabric protect against viruses?

A mask is a sanitary product worn on the mouth and nose to filter the air entering the mouth and nose. It is best not to reuse a mask because its protective ability will decrease with the number of times it is used. Many friends don't understand why masks with valves cannot be used? I believe you will understand after reading the following introduction.

Contents of this article

1. Why can't masks with valves be used?

2. Can masks made of meltblown fabric protect against viruses?

3. How to distinguish the front and back of the mask

Why can't masks with valves be used?

It is not that masks with valves cannot be used, but they are not recommended for use in daily life. Because masks with valves can only protect the wearer, not the people around them. When wearing a mask with a valve, the exhaled gas will not be filtered, but will be directly discharged into the surrounding environment through the breathing valve, which will cause unpredictable risks to the people around.

Masks with valves only provide one-way protection and are not medical protective masks that meet the standards.

A mask is a sanitary product, generally worn on the mouth and nose to filter the air entering the mouth and nose to block harmful gases, odors, droplets, viruses and other substances. It is made of gauze or paper and other materials.

Masks with valves are mainly used for industrial dust and haze prevention.

Can masks made of meltblown fabric protect against viruses?

Masks with meltblown fabrics can generally prevent viruses. Meltblown fabrics are the core material for making masks. They are made of polypropylene as the main raw material. The fiber diameter is small, similar to a sieve, which can play a good filtering role and prevent viruses from entering the mouth and nose.

Meltblown cloth is the main raw material for making N90, N95 and N99 masks. It has a fluffy structure and good wrinkle resistance.

Meltblown cloth has the advantages of good filtering, shielding, thermal insulation, oil absorption, etc. It can be used to make filter materials, isolation materials, mask materials, thermal insulation materials, oil absorption materials, clothing materials, environmental protection materials, etc.

A mask is a sanitary product worn on the mouth and nose to filter the air entering the mouth and nose. It can block harmful gases, droplets, viruses and other substances.

How to distinguish the front and back of the mask

The masks on the market are usually blue medical masks. The white or light-colored side is the reverse side of the mask. You can also judge by the metal strip of the mask. The raised side of the metal strip is the front side of the mask. Masks generally adopt a three-layer design. If you wear the mask upside down, the filtering function of the mask will not work.

The shelf life of an unopened disposable medical mask is generally 2-3 years from the date of production. It is not recommended to wear a mask that has exceeded its shelf life.

Before wearing a mask, you should check the shelf life of the mask and whether it is damaged or contaminated. It is best not to reuse the mask because its protective ability will decrease with the number of uses.

The two sides of the mask cannot be worn alternately because the outer layer of the mask will accumulate a lot of pollutants such as dust and bacteria from the outside air.