These KN95 masks are produced in very clean, almost dust-free production environments. The KN95 masks comply with standard ASTM-Level 3 (KN95 grade), The performance is tested on four sections:
1. 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. Filtering efficiency comes in over >95%.
2. Resistance to inhaling (air in): must be less than 350 Pa.
3. Resistance to exhale (air out): must be less than 250 Pa.
4. Quality of earloop/headband straps: pulling force of 10N lasting for 10 seconds, cannot break and remain intact.