Can I use a medical mask that has expired? Unopened? What does a mask grade D mean?

Masks are sanitary products that can block harmful gases, odors, droplets, viruses and other substances. They are made of gauze or paper. Can medical masks be used after they expire? Can they still be used if they are unopened? What does a grade D mask mean? The following is the relevant knowledge shared by Encyclopedia Knowledge Network.

Contents of this article

1. Can expired medical masks be used? Unopened

2. What does mask grade D mean?

3. What is a double mask?

Can expired medical masks be used?

It is not recommended to use unopened but expired medical masks. Because the protective effect of expired medical masks will be reduced, and if the masks are stored in the living environment for a long time, there is a possibility of mold or bacterial contamination. Not only can they not play a good protective role when used, but they may also cause certain damage to health.

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.

Medical masks are mostly made of one or more layers of non-woven fabrics. The main production processes include meltblowing, spunbond, hot air or needle punching. They have the functions of resisting liquids, filtering particles and bacteria, and are a type of medical protective textile.

According to performance characteristics and scope of application, medical masks can be divided into: medical protective masks, medical surgical masks, and ordinary medical masks.

What does mask grade D mean?

Mask grade D is equivalent to the international KN90 model mask. It is suitable for general protection against particulate matter in air-polluted environments in daily life, but this mask is not suitable for protection in special industries such as escape, fire fighting, medical use, and industrial dust prevention.

Generally, the protection level of masks is divided into four levels: A, B, C, and D. The corresponding protection effects of each level are not less than 90%, 85%, 75%, and 65%, respectively.

The environments suitable for masks at different levels are severe environmental pollution, severe and below pollution, heavy and below pollution, and moderate and below pollution.

Choose a mask of appropriate level according to the environment you are in.

What is a double mask?

A double mask refers to two masks with the same appearance, size, pattern, color, performance and function. Such masks are called double masks. They are generally used by couples or husband and wife, which means they are paired.

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 have a certain filtering effect on the air entering the lungs. Wearing a mask is very effective when respiratory infectious diseases are prevalent or when working in an environment polluted by dust.

In the early 13th century, masks only appeared in the Chinese court. In order to prevent their breath from being transmitted to the emperor's food, waiters used a mask made of a silk and gold thread.