There are four main elements that need to be identified when purchasing a qualified protective mask:
1. Select qualified manufacturers and suppliers: To buy dust masks, you should go to a manufacturer of protective masks with a production license or a store with a designated sales license for special labor protection products.
2. Choose the appropriate variety: The materials used in the protective mask should have no odor and be harmless to the human body, especially the materials that come into contact with the human face should be non-irritating and allergic, such as silicone.
3. When purchasing, you should check whether there is a product name on the product package, whether there is the name, address, telephone number, production date of the manufacturer or supplier, whether the product certificate and instruction manual are attached on or inside the outer package, and the instruction manual should be Including the scope of use, washing requirements and storage conditions. There should also be a production license number on the protective mask package. In addition, you should try your best to ask the supplier to show the test report of the batch of goods, as well as the production license of the manufacturer of the goods, and check the validity period of the above reports and certificates.
4. Appearance quality: Check whether the packaging of the protective mask is complete and whether it is damaged. There should be no holes or stains on the surface of the mask, and the medical protective mask should not have an exhalation valve. 
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