Disposable medical masks: daily use Disposable medical […]
Disposable medical masks: daily use
Disposable medical masks should meet the Chinese pharmaceutical industry standard "YY/T0969 Disposable Medical Masks", and the bacterial filtration efficiency (BFE) ≥ 95%. Masks must have a protective effect, and after wearing them, they should not make the user feel too stuffy or even have difficulty breathing. Therefore, disposable medical masks need to be tested for ventilation resistance, and the ventilation resistance should not be greater than 49Pa/cm2. This type of mask is suitable for ordinary people to use when they are not in contact with patients with symptoms such as fever and cough. Generally, it is enough to wear them when going out or taking public transportation.
Medical surgical masks: available in the hospital
Medical surgical masks should comply with the Chinese medical industry standard "YY0469 Medical Surgical Masks", similar to disposable medical masks, the bacterial filtration efficiency (BFE) of medical surgical masks is ≥95%, and the pressure difference between the two sides (equivalent to ventilation resistance) is not greater than 49Pa/cm2. However, this type of mask must meet two other standards, one is the particle filtration efficiency (PFE) ≥ 30% (non-oily particles), and the other is to pass the synthetic blood penetration test (2mL synthetic blood 16.0kPa, internal impermeability), that is Check whether the mask can be penetrated by splashes of blood, droplets from sneezing, etc. Medical surgical masks are suitable for the hospital environment, and have long-distance contact with patients with fever, cough and other symptoms more than 3 meters. If you go to the hospital or visit patients, it is recommended to wear it.
Medical protective mask: used when touching patients
Medical protective masks comply with the national standard "GB19083 Technical Requirements for Medical Protective Masks", which can filter most microorganisms and resist splashes of blood and body fluids to a certain degree. The outer surface has a certain degree of waterproofness and high adhesion. Its particle filtration efficiency is ≥95% (non-oily particles), and it has passed a higher standard synthetic blood penetration test (2mL synthetic blood 10.7kPa, internal impermeability), and has a certain surface moisture resistance (GB/T4745-1997, not low At level 3). The protective effect of medical protective masks is better, but the comfort is poor, making users feel that they are not breathing well. Medical protective masks are generally used by professionals when they come into contact with patients with respiratory infectious diseases. Ordinary people generally do not need to use them unless they directly take care of patients with new coronary pneumonia.
KN95 mask: available for short-term contact with patients
KN95 is a type of mask that the public is more familiar with. According to my country's national standard "GB2626 Respiratory Protective Equipment Self-priming Filtering Anti-Particulate Respirator", the filter elements of filter respiratory protective equipment can be divided into KN and KP categories according to their filtering performance. For microorganisms, just look for KN, the number "95" refers to the level of filtration efficiency. KN masks only test the filtration efficiency of particulates, and have not tested the synthetic blood penetration, surface moisture resistance and other indicators. Therefore, this type of mask can block the virus when used for a short time, but it cannot be used for contact with patients who may be splashed or for long-term contact. patient. It can be used by ordinary people and medical personnel who have been in contact with patients with new coronary pneumonia for a short period of time, but cannot be used by professionals who have been in contact with patients for a long time.