What does the dust mask KN100 grade mean?

KN100 ----- is the highest level in the protection standard of GB2626-2006 "Respiratory Protective Products Self-priming Filtering Anti-Particulate Matter Respirator", KN stands for Anti-Particulate Matter, and 100 is the value of filtration efficiency. That is to 100% of the current dust protection efficiency.

Many workplaces in the construction industry have a large amount of dust, especially cement dust. Long-term inhalation can cause cement pneumoconiosis. At present, dust masks are divided into three levels, KN90, KN95 and KN100 protection efficiency are 90%, 95% and Above 99.97%, KN100 grade dust masks can effectively prevent pneumoconiosis.