3M900 1 ear band KN90 is a particulate matter protective mask, which is not a medical mask. 3M particle-proof mask, also known as dust-proof mask, is used to protect workers' health at work and belongs to the category of occupational health. Particle protective masks are used to reduce all kinds of harmful particles suspended in the air inhaled through the respiratory tract, from coarse dust and dust to fine dust, soot, soot and atmospheric pollutants PM2.5 produced in various production processes, including fine germs.
The filtration efficiency of 3M900 1V is 90% according to Chinese national standards, and it can prevent viruses in daily life. At present, novel coronavirus is relatively not serious. You can wear a 3m900 1v mask when you go out. You must pay attention to personal protection at ordinary times and avoid going to crowded places.
Classification of masks:
1, masks are generally divided into ordinary gauze masks, which belong to the textile category, can be used for civilian use and can block large particles.
2. The medical mask is made of one or more layers of non-woven fabrics, which has the functions of blocking liquid and filtering particles and bacteria, and is a medical protective article.
3. Anti-fog masks are mainly used for daily protective masks.
4. Dust masks and smoke masks are generally used for occupational protection. Dust masks are mainly used to prevent dust, smoke and microorganisms, and are divided into three grades: KN95, KN 100 and KN90. Fume masks are mainly used to prevent fumes and oil mist, as well as dust and smoke microorganisms, and are divided into three grades: KP 100, KP95 and KP90.