Particulate protective masks include smoke, dust and germs and other particulate matter, and they are mostly utilized in environments which require labour protection. 97% ) , and particulate matter filtered oily KP class ( KP90,1. other non-medical masks According to the different materials used, other non-medical masks normally consist of cloth masks, gauze masks and paper masks. The cloth mask has great air permeability, has a warmth retention effect, and doesn't filter PM2 itself. The effect of the 5th class of very small particles, some goods have a specific filtering role in the middle of this interlayer filter, but the dust and bacteria prevention effect are very inferior, and there is almost no anti virus effect." SARS" one form that was used throughout the 12 ~ 24 gauze masks layers, but this kind of mask breathability, comfort and poor adhesion, low efficacy of anti-virus, the filtering effect of just 32 . 3 percent ~ 43 . 9% [6]. Paper masks used in food, cosmetic and other industries, fantastic air permeability, comfortable and user friendly, the paper follows the GB / T22927 - 2008 standard, but no bacteria and particulate filtering. 1 . 6 Comparison of specialized requirements of various types of masks The technical prerequisites for common mask goods in China's quality standards are shown in Table 1 . 1) Filtration efficiency indicators consist of bacterial filtration efficiency ( BFE) and particulate matter filtration efficacy ( PFE ) . Since the virus is a lot larger than the diameter of the germs, usually believed to filter masks smaller diameter particles has better protective effect against the virus, since this PFE ( instead of BFE ) are a significant indicator for the test mask virus defense function. Though disposable medical masks need BFE≥95%, there is no need for PFE Requirements ; as well as the performance indicators of medical masks, medical protective masks, and non-medical protective masks need to be investigated for PFE , and also the protection against germs is more dependable. 2 ) From the technical standards, disposable medical masks and non-medical protective masks don't have any requirements for splash liquid and prevention penetration, therefore there's no demand for synthetic blood penetration tests ; medical masks and clinical protective masks have artificial blood penetration Analysis requirements. 3 ) The inhalation immunity of medical protective masks and particulate protective masks is relatively large, and the requirement isn't to exceed 343. 2 Pa; life protective masks require no longer than 175 Pa , along with the most inhalation resistance of health masks and medical surgical masks is 49 Pa/cm 2 . 4 ) In terms of microbial limit, the entire colony count and fungal colony limit of medical protective masks are different from the requirements for disposable medical masks, medical masks, and non-medical protective masks. 5 ) Medical protective masks and chemical protective masks are different from disposable medical masks, medical surgical masks, and lifestyle protective masks, and also have tightness requirements. 2 Wearing and selection standards of masks 2 wear: basic principles Wear it liberally and moderately, utilize it in a standardized way, and effectively shield it. Particular requirements [10 ï¼11] |}1 ) Within an open and ventilated place in a non-epidemic area, there's absolutely no need to put on a mask.It is necessary to wear a mask when entering confined public places. 2) it's recommended to wear disposable medical masks in open and ventilated places in regions with higher epidemics ; when entering confined public places, wear medical surgical masks or particulate protective masks. 3) When infected patients or patients with suspected symptoms go to the hospital for treatment, they need to wear a protective mask without an exhalation valve along with a medical surgical mask. 4 ) Patients with fundamental respiratory ailments should use protective masks under the guidance of a physician. 5 ) Non-medical masks like cotton wool, activated carbon and sponge. Masks such as cotton yarn, activated sponge and carbon have a particular protective effect. They are also able to reduce the spread of droplets brought on by coughing, sneezing and talking. They can be chosen based on the situation.Pick general population The general population has different risks of infection in various surroundings ( see Figure 1 ) , and can be divided into multiple types of people. In response to the new type of coronavirus pneumonia, More Information the National Health Commission's Disease Prevention and Control Bureau recommends the selection of masks for individuals under different hazard levels, as shown in Figure 2 and Figure 3 [ High-risk vulnerability personnel Close contacts of cases of pneumonia infected with the new coronavirus have to be isolated for medical observation at home. The period of medical monitoring is from the last contact with the situation or the infected person without any effective coverage 14Daily traveler 1 . Daily traveler 2 . People who go to see a doctor, who want to go to a medical establishment if they have suspicious symptoms 3 . Specific industry employees 1 . Public transportation personnel, taxi drivers, public support personnel, armed police, traffic police, security, media colleagues, couriers, etc.. 2 .
4 . Specimen collection personnel, biosafety laboratory staff 5 . Environmental cleaning and disinfection personnel, corpse disposal employees ( Environment : bus, cab, police station, community, hospital, etc. ) |}
