What should I pay attention to when buying disposable medical masks?

What should I pay attention to when buying disposable medical masks? The following editor from Lancet will explain to you:

The dust barrier of medical mask particles is gauze. Some fine dust, especially dust less than 2.5 microns, can enter the respiratory system through the tissue. In the process of filtering this filter material, a dust-proof mask composed of a filter material activated carbon fiber insole or a non-woven fabric with inhalable dust less than 2.5 microns. The mask is designed to prevent air from passing through the gap between the mask and the face instead of being sucked in through the filter. Air is like water, and there is almost no resistance where it flows. When the shape of the mask is not close to the face, dangerous substances in the air will leak into the human respiratory tract. Therefore, even if you choose a mask with filter material. It cannot protect your health. Many foreign laws and regulations stipulate that workers should conduct mask sealing tests on a regular basis. The goal is to ensure that workers choose the correct masks and follow the correct steps to wear them. Wear them comfortably so that workers are willing to stick to them in the workplace and increase their productivity. Currently, there is no need to clean or replace foreign maintenance-free masks. When the dustproof performance is saturated or the mask is damaged, they will be discarded. This not only ensures the hygiene of the mask, but also saves the time and energy of workers in maintaining the mask. Many masks are curved, which can ensure a good fit with the face, and maintain a certain amount of space in the mouth and nose for comfort. 1. Lightweight, comfortable, odorless, free of glass fiber, non-irritating to the skin, and waterproof. 2. Soft and comfortable adjustable nose clip 3. Breathing resistance should be small and wear hygienic. The filter material absorbs aerosols, dust, smoke, liquid droplets, toxic gases and toxic vapors to prevent them from being inhaled. Other features: 1. Filtration efficiency: Under specified conditions, care products filter out particulate matter in the air; 2. Flame retardant performance: Protect the performance of the product to prevent itself from being ignited, burned and flame-retardant; 3. Disinfection: Use physical or Chemical methods kill or remove pathogenic microorganisms on the medium to make it harmless; 4. Sterilization: Use physical or chemical methods to kill all microorganisms on the medium to make it sterile; 5. Dustproof effect can be achieved.