What are the classifications of masks?- Hangzhou Runheng Medical Co.,Ltd

1.N series: no time limit for protection of non-oily suspended particles

R series: Protection against non-oily suspended particles and sweat-oily suspended particles for eight hours

P series: protection of non-oily suspended particles and sweat oily suspended particles without time limit

When the carrier of some particulate matter is oily, and these substances attached to the electrostatic non-woven fabric will reduce the electrical properties and allow fine dust to penetrate. Therefore, the anti-aerosol-containing filter material must undergo special electrostatic treatment to prevent fineness. The purpose of dust. Therefore, each series is divided into 3 levels: 95%, 99%, 99.97% (referred to as 95, 99, 100 for short), so there are 9 sub-categories of filter media.

China Wholesale Disposable face mask

2. European Union EN149 standard:
FFP1 masks: the lowest filtering effect is 80%
FFP2 mask: the lowest filtering effect is 94%
FFP3 masks: the lowest filtering effect is 97%

3.the Australian AS1716 standard
P1: The minimum filtering effect is 80%
P2: The lowest filtering effect is 94%

4. Japanese MOL verification standards:
According to Japan’s Decree No. 0207006 promulgated on February 7, 2005, the standards for dust masks are as follows

Test environment conditions
Experimental particles	DOP (liquid)	NaCl (solid)
Particle size distribution μm	0.15-0.25	0.06-0.1
Experimental concentration [mg/m3]	≤100	≤50
Experimental flow [L/min]	85	85
Test time	Total supply 200mg	Total supply 100mg

Standard for Replaceable Dust Respirators
distinguish		Filtration efficiency [% or more]	Inspiratory pressure [Pa below]	Exhaust pressure [Pa below]
DOP	NaCl	Filtration efficiency [% or more]	Inspiratory pressure [Pa below]	Exhaust pressure [Pa below]
RL3	RS3	99.9	160	80
RL2	RS2	95.0	80	70
RL1	RS1	80	70	70

Standard for disposable masks
distinguish		Filtration efficiency [% or more]	Inspiratory pressure [Pa below]		Exhaust pressure [Pa below]
DOP	NaCl	Filtration efficiency [% or more]	With air valve	Airless valve	With air valve	Airless valve
DL3	DS3	99.9	150	100	80	100
DL2	DS2	95	70	50	70	50
DL1	DS1	80	60	45	60	45

5. Chinese national standard GB6223-86UDC614.894:

The above inspection standards except the Japanese standard (0.06-0.1 micron) are tested with a particle size of 0.3 micron. The detection flow rate of the EU standard is 95L/min, and the American standard is 85L/min. my country's national standard uses more than 90% of the suspended particle size of <5 microns and more than 70% of <2 microns, and the flow value is 42.5L/min. In the testing and certification of filter materials, the idea of "worst case" is adopted, that is, the conditions for testing in the laboratory are set as the worst. For example, the aerodynamic calculated diameter of the ammoniated sodium salt or DOP oil mist used in the efficiency experiment is 0.3 microns, which represents the size of the extremely small particles that are most easily penetrated by the filter material. Respiration during heavy physical labor, the filter material must be pretreated with high temperature and humidity before the experiment, which represents a harsh working environment. All of these are designed to test if the filter material can pass the test under such harsh conditions. Reach the corresponding efficiency level, then in actual application, it will be able to protect the health of workers more effectively.

Anti-poisonous filter materials generally use activated carbon or chemically treated activated carbon as the material, and filter the poisonous gas or vapor through adsorption or chemical reaction without being inhaled by people. There are many micropores in the internal structure of activated carbon that can form a huge specific surface area. These micropores can inhale poisonous vapors and gas molecules of different molecular sizes without escaping. The treatment and installation requirements of activated carbon are very high. If improper treatment or the activated carbon particles are very coarse, resulting in gaps between the particles, the poisonous gas will penetrate into the respiratory tract from the gaps without being adsorbed. Therefore, it is very unscientific to replace the bagged activated carbon by yourself. The activated carbon in a good chemical filter box should be densely packed, with a small particle size and a large specific surface area, so that the anti-virus time will be long. At the same time, it should also consider low breathing resistance and comfortable wearing.