N95, KN95, FFP2, P2 respirator face masks, what are their differences?

What are the N95, KNP5, FFP2, P2 ?

First of all, these are the standards of masks, not the brand of a certain mask, not the model of a certain mask, not the function of a certain mask, but the standard of a mask, which is a standard !

Different face mask standards in the world currently:

  • N95 (United States NIOSH-42CFR84)
  • FFP2 (Europe EN149-2001)
  • KN95 (ChinaGB2626-2006)
  • P2 (Australia/New Zealand AS/NZA1716:2012)
  • Korea 1st class (Korea KMOEL -2017-64)
  • DS (Japan JMHLW-Notification 214,2018)

What does these standards stand for ?

 

Certification/ Class (Standard)

 

N95 (NIOSH-42C

FR84)

 

 

FFP2 (EN 149-2001)

 

KN95 (GB2626-20 06)

 

 

P2 (AS/NZ 1716:2012)

Korea 1st Class (KMOEL – 2017-64) DS (Japan JMHLW-

Notification 214, 2018)

Filter performance – (must be ≥ X% efficient) ≥ 95% ≥ 94% ≥ 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)* – tested on human subjects each performing exercises N/A ≤ 8% leakage (arithmetic mean) ≤ 8% leakage (arithmetic mean) ≤ 8% leakage (individual and arithmetic mean) ≤ 8% leakage (arithmetic mean) Inward Leakage measured and included in User Instructions
Inhalation resistance – max pressure drop ≤ 343 Pa ≤ 70 Pa (at 30 L/min)

≤ 240 Pa (at 95 L/min)

≤ 500 Pa (clogging)

≤ 350 Pa ≤ 70 Pa (at 30 L/min)

≤ 240 Pa (at 95 L/min)

≤ 70 Pa (at 30 L/min)

≤ 240 Pa (at 95 L/min)

≤ 70 Pa (w/valve)

≤ 50 Pa (no valve)

Flow rate 85 L/min Varied – see above 85 L/min Varied – see above Varied – see above 40 L/min
Exhalation resistance – max pressure drop ≤ 245 Pa ≤ 300 Pa ≤ 250 Pa ≤ 120 Pa ≤ 300 Pa ≤ 70 Pa (w/valve)

≤ 50 Pa (no valve)

Flow rate 85 L/min 160 L/min 85 L/min 85 L/min 160 L/min 40 L/min
Exhalation valve leakage requirement Leak rate ≤ 30 mL/min N/A Depressurizatio n to 0 Pa ≥ 20 sec Leak rate ≤ 30 mL/min visual inspection after 300 L /min for 30 sec Depressurizatio n to 0 Pa ≥ 15 sec
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%

Definitions

Filter performance – the filter is evaluated to measure the reduction in concentrations of specific aerosols in air that passes through the filter.

Test agent – the aerosol that is generated during the filter performance test.

Total inward leakage (TIL) – the amount of a specific aerosol that enters the tested respirator facepiece via both filter penetration and faceseal leakage, while a wearer performs a series of exercises in a test chamber.

Inward leakage (IL)– the amount of a specific aerosol that enters the tested respirator facepiece, while a wearer performs a normal breathing for 3 minutes in a test chamber. The test aerosol size (count median diameter) is about 0.5 micro meter.

Pressure drop – the resistance air is subjected to as it moves through a medium, such as a respirator filter.

Based above table, it is reasonable to consider China KN95, AS/NZ P2, Korea 1st Class, and Japan DS FFRs as “equivalent” to US NIOSH N95 and European FFP2 respirators, for filtering non-oil-based particles such as those resulting from wildfires, PM 2.5 air pollution, volcanic eruptions, or bioaerosols (e.g. viruses). However, prior to selecting a respirator, users should consult their local respiratory protection regulations and requirements or check with their local public health authorities for selection guidance.

Reference document: https://multimedia.3m.com/mws/media/1791500O/comparison-ffp2-kn95-n95-filtering-facepiece-respirator-classes-tb.pdf

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