KN95 masks are produced in very clean, almost dust-free production environments. Approved by FDA and listed on FDA EUA list.
The KN95 masks comply with standard GB 2626-2006 (KN95 grade), The performance is tested on four sections:
1) the Filtering efficiency, is over >95%
Tested using NACL as the particulates, the flow is: 85L/minute, the density of particulates: 15mg per CBM, at regulated temperature range, and at regulated humidity range
2) the resistance to inhaling (air in): must be less than 350 Pa
3) the resistance to exhale (air out): must be less than 250 Pa
4) the quality of earloop/headband straps: pulling force of 10N lasting for 10 seconds, must be OK, cannot break
The KN95 Surgical Medical Masks are made of strong but lightweight breathable full mesh nylon material. It has 95% filtration of particles >0.3 microns in size.