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What’s the difference between P2, N95 and KN95 face masks?

The difference lies in the testing requirements for each country of origin. P2 masks adhere to European testing requirements, KN95 to Chinese requirements and N95 masks follow US guidelines. All offer nearly the same level of protection, according to a study by respirator company 3M.

Certification/Class
N95 
FFP2 
KN95 
P2 
Korea 1st Class 
DS 
Filter performance 
≥ 95%
≥ 95%
≥ 95%
≥ 94%
≥ 94%
≥ 95%
Test agent
NaCl
NaCl and paraffin oil
NaCl
NaCl
NaCl and paraffin oil
NaCl
Flow rate
85 L/min
95 L/min
85 L/min
95 L/min
95 L/min
85 L/min
Total inward leakage (TIL) 
N/A
≤ 8% leakage 
≤ 8% leakage 
≤ 8% leakage 
≤ 8% leakage 
Inward Leakage measured and included in User Instructions
Inhalation resistance 
≤ 343 Pa
≤ 70 Pa (at 30L/min)
≤ 240 Pa (at 95 L/min)
≤ 500 Pa (clogging)
≤ 350 Pa
≤ 70 Pa (at 30L/min)
≤ 240 Pa (at 95L/min)
≤ 70 Pa (at 30L/min)
≤ 240 Pa (at 95L/min)
≤ 70 Pa (w/valve)
≤ 50 Pa (no valve)
Flow rate
85L/min
Varied – see
above
85L/min
Varied – see
above
Varied – see
above
40L/min
Exhalation resistance 
≤ 245 Pa
≤ 300 Pa
≤ 250 Pa
≤ 120 Pa
≤ 300 Pa
≤ 70 Pa (w/valve) ≤ 50 Pa (no valve)
Flow rate
85L/min
160L/min
85L/min
85L/min
160L/min
40L/min
Exhalation valve leakage requirement
Leak rate ≤ 30mL/min
N/A
Depressurization to 0 Pa ≥ 20 sec
Leak rate ≤ 30mL/min
Visual inspection after 300L /min for 30 sec
Depressurization to 0 Pa ≥ 15sec
Force applied
-245 Pa
N/A
-1180 Pa
-250 Pa
N/A
-1,470 Pa
CO2 clearance requirement
N/A
≤ 1%
≤ 1%
≤ 1%
≤ 1%
≤ 1%