How often do N95 masks change
There is no fixed replacement time for N95 masks. The dust concentration in different environments is different. The use time of each person is different. The different dust holding capacity of various N95 masks and the maintenance methods of N95 masks will affect the service life of N95 masks. The N95 mask is one of the 9 particulate dust masks certified by the National Institute of Occupational Safety and Health. "N" refers to particles that are not suitable for oiliness; "95" refers to a filtration efficiency of 95%. The filtration efficiency of N99 masks reaches 99%. Experts recommend wearing N95 masks to be replaced every two days.
Can N95 masks be washed
N95 masks can not be cleaned. The filter cotton of dust masks now uses the principle of electrostatic adsorption. Once cleaned, the filter cotton structure is easily damaged, resulting in poor protection.
The principle of masks to prevent diseases is actually very simple, is to block the droplets of bacteria in the air.
The requirements for materials and filterability are not so high. Although the disposable sterile medical mask is very cheap, the barrier effect is actually not much different from the expensive N95 mask. If you are not in the epidemic area and have no close contact with the patient, there is no need to wear N95.
Babies under the age of 3 are not recommended to wear masks. The child's respiratory system is not fully developed and it is easy to suffocate. And when a baby wearing a mask feels uncomfortable, it is easy to resist. Older babies can choose a mask of the appropriate age, which must be close to the face to play a protective role.
Can N95 masks be reused
Many people think of using a high-power electric blower to blow the mask for 30 minutes, or spraying the inside and outside of the mask with medical alcohol, hoping to kill the virus attached to the surface and recycle it.
As everyone knows, after one pass operation, the fiber filterability of the N95 mask will be changed, which does not provide a good protection. The above operation is not recommended. If you wear a N95 mask to a place with few people, you can use it repeatedly 5 times and return it to a dry place to ventilate without heating or spraying alcohol. If you are in a crowded place such as a hospital, it is best to change it frequently; but general surgical masks are not recommended for repeated use, generally 2-4 hours.
Features of N95 masks
"N95" is a standard established by the National Institute of Occupational Safety and Health (NIOSH) under the US CDC, not a specific product name. As long as it conforms to the N95 standard and has passed the NIOSH review, the product can be called "N95 mask".
Among the nine standards formulated by NIOSH, N95 is the lowest standard for infection protection, which is cheap and easy to be adopted by medical institutions. N95 masks are used for occupational respiratory protection, including certain microbial particles (such as viruses, bacteria, mold, Bacillus anthracis, Mycobacterium tuberculosis, etc.).
The biggest feature of the N95 mask is that it can prevent droplet infections caused by patients' body fluids or blood splashes. The size of the droplets is 1 to 5 microns in diameter. The United States Occupational Safety and Health Administration (OSHA) stipulates that medical personnel exposed to tuberculosis bacteria must wear masks above the N95 standard for medical institutions.