About two years ago, Yingzong Pharmaceutical, which specializes in the production of medical and health care products, saw that there are business opportunities for masks with filter function. They believed that the protection of general surgical masks is insufficient; the general N95 masks have poor air permeability and it is difficult to have viruses at the same time. Two requirements, filtering function and high air permeability; bring blue ocean business opportunities. The company thus cooperated with NAMI to produce NASK and seek technological breakthroughs.