Generally in autumn, the haze weather will be very bad, and street pedestrians will wear various types of dust masks to prevent haze. For example, disposable masks, ordinary masks, medical masks, activated carbon masks, etc., medical masks are usually high-efficiency electrostatic filter materials, while ordinary masks are printed with a very good appearance. So, what are the differences between medical masks and ordinary masks? What are the principles for the selection of medical masks? Principles for the selection of medical masks 1. The dust resistance efficiency of the masks. The dust blocking efficiency of a mask is based on its blocking efficiency for fine dust, especially for respirable dust below 5 microns. General gauze masks, the principle of dust blocking is mechanical filtration, that is, when dust hits the gauze, through layers of barriers, some large particles of dust are blocked in the sand cloth. However, for some fine dust, especially dust less than 5 microns, it does not play a blocking role. Nowadays, there are some dust-proof masks abroad. The filter material is composed of fibers charged with permanent static electricity. When passing through this filter material, the respirable dust less than 5 microns is attracted by static electricity and is adsorbed on the filter material. Play the role of dust blocking. The principle of the selection of medical masks is the degree of closeness between the mask and the shape of the face. When the shape of the mask is not close to the human face, the dangerous objects in the air will leak in from the tightness and enter the human respiratory tract. So, even if you choose a copper mask
with the best filter material, it cannot protect your health. Many foreign laws and standards now stipulate that workers should regularly test the tightness of masks. The purpose is to ensure that workers choose appropriate masks and master the correct way to wear anti-smog masks. The principle of selection of medical masks. Third, the masks are comfortable to wear. The requirements include low breathing resistance, light weight, sanitary wear, and convenient maintenance. In this way, workers will be willing to insist on wearing them in the workplace. Now there are maintenance-free masks. There is no need to clean or replace parts. When the dust barrier is saturated or the mask is damaged, it can be discarded directly. This not only ensures the hygiene of the mask, but also saves the time and effort of workers to maintain the mask. Moreover, many masks are designed with arches, which can not only ensure a good fit with the shape of the human face, but also retain a certain amount of space in the mouth and nose for comfortable wearing. Are medical masks dust-proof? The characteristics of medical masks are light, comfortable, odorless, glass fiber-free, non-irritating to the skin, waterproof, and after disinfection, it can kill or remove pathogenic microorganisms on the media to make it harmless; Dust-proof, because of the low respiratory resistance, it is hygienic to wear, and absorbs aerosols, dust, smoke, mist, poisonous gases and poisonous vapors through the filter material, blocking them from being inhaled by people, effectively isolating pollution sources. In addition to higher hygiene requirements, medical protective masks should also have the function of effectively blocking liquid splashes. The ability of medical mask materials to block pressured liquids should be relatively high. Only in this way can medical personnel be effectively protected. Therefore, in the standards of medical protective masks, special testing methods are used to test the liquid barrier performance of such products. The black shield anti-haze masks used in industrial environments do not need to have such special requirements, and there is no such requirement in the testing standards. In addition, medical protective masks are not allowed to have an exhalation valve. This is because when medical protective masks are allowed to be used as surgical masks, if you wear a mask with an exhalation valve, the microorganisms carried in the exhalation will be directly discharged out of the mask, posing a threat to patients undergoing surgery. Many industrial protective masks have an exhalation valve design, but the price of dust-proof and haze masks with exhalation valve is much higher than those without valves. Let’s take a look at the scope of application of medical masks: 1. Medical protective masks are suitable for medical staff and related staff to protect against airborne respiratory infectious diseases, with a high level of protection; 2. Medical surgical masks are suitable for medical staff or related personnel The basic protection of, as well as the protection to prevent the spread of blood, body fluids and splashes during invasive operations; 3. The protective effect of ordinary medical masks on pathogenic microorganisms is not accurate, and can be used for disposable hygiene care in ordinary environments, or Barrier or protection of particles other than pathogenic microorganisms such as pollen. 394
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