Under the epidemic situation, common disaster relief su […]
Under the epidemic situation, common disaster relief supplies like N95, KN95, and medical surgical masks require people to prepare daily, but it is precisely because of the huge market demand that some lawbreakers make fake masks, sell expired masks, and second-hand masks to entrap consumers. Then we How to identify the authenticity of masks during the purchase process?
A few tips to tell you how to judge whether the mask you buy is a qualified product.
1. How to distinguish medical surgical masks
First, see if the packaging signs are complete. According to the marking requirements on the national standard GB 19083-2010, the package needs to have: product name, model; name of manufacturer or supplier; executive standard number; product registration number; filter grade or corresponding description; "please before use Please refer to the words or symbols of instructions for use; storage conditions and expiry date; single-use products should be marked with "one-time use" or equivalent; if sterilized products, sterilization expiry date and sterilization method should be indicated.
Qualified KN95 RESPIRATOR TEST REPORT example from Dongyu Nonwoven, professional KN95 mask and respirator manufacturer.
Second, look at the registration certificate number, which is the string of numbers after the "X-Mechanical Injection". For example, the registration certificate number on the package is 20162640851.
Third, check the inspection report. Inspection and testing reports include reports issued by third-party inspection and testing institutions accredited by the state or laboratory. This type of report is generally not required for every batch, and is generally issued during registration inspection. Inspection and testing items are in accordance with all provisions of national standards. Carry out the whole project inspection, pay special attention to the fact that the inspection report does not mean that the product is qualified. Consumers, especially companies, need to pay special attention to the purchase of masks when making bulk purchases. Be careful not to buy fake and inferior products, which can cause loss of property, or even be infected by the virus because of wearing fake masks.
Finally, remind everyone that masks must have an inspection report issued by a legal inspection and testing agency, but also a factory inspection report and a certificate of conformity issued by the company for the batch of masks. Therefore, you need to purchase carefully.
2. Mask testing standards
3, The barrier effect of particulate protective masks on aerosols is better than that of medical surgical masks and medical disposable masks
The relatively clear transmission routes of the new coronavirus are: direct transmission, aerosol transmission, and contact transmission. Wearing a mask is the most effective way to block the spread of aerosols. So what type of mask has a better barrier effect on aerosol particles?
From the perspective of standard requirements, GB19083-2010 "Technical Requirements for Medical Protective Masks", GB2626-2019 "Respiratory Protective Equipment Self-priming Filtered Particle Respirators", GB/T32610-2016 "Technical Specifications for Daily Protective Masks" The requirements for oily particulate filtration efficiency are all above 90%, which is significantly higher than YY0469-2011 "Medical Surgical Masks" (≥30%) and YY/T0969-2013 "Disposable Medical Masks" (particulate filtration efficiency is not assessed).
From the point of view of the filter layer structure, the microstructure of the N95/KN95 mask filter layer is obviously denser than that of medical surgical masks and medical disposable masks, and has a better barrier effect.