What is the shelf life of KN95 and medical disposable masks?

What is the shelf life of KN95 and medical disposable masks?
There is a shelf life.

The length of the life of the mask is actually determined by the fabric material, technology, user habits, etc.

1. On the fabric: because the mask directly contacts the face and mouth, its breathability, skin flexibility, stretchability and durability are the main factors that determine the length of use of the mask. Among them, the breathability is directly related to the cleanliness of the mask, and only if the mask is clean, the mask can play its protective role, and will not become a breeding ground for germs.

And good skin softening can avoid e68a84e8a2ade79fa5e9819331333431363531 phenomena such as itching and allergies when the face is rubbed against the fabric. As for the elasticity and durability, it is also related to whether the shape of the mask remains unchanged.

2. Technical aspects: With the high incidence of air pollution such as smog, the intensity of air pollution continues to increase. Nowadays, the lifespan of masks must be continuously updated and improved technically. In addition to the introduction of new filter media technology, this also requires that the mask and face fit technology must be improved.

3. Usage habits: If the fabric and technology of a mask reach an excellent standard, the shelf life is at least 2 years. However, if the method of using the mask, as well as the cleaning and maintenance methods, are not carried out according to scientific methods, then its lifespan will be greatly reduced.

Therefore, the life of the mask depends on the manufacturer's production materials and processes, as well as the user's use and maintenance methods.