The standard of Dust Mask.
The standard of Dust Mask
(1) The National Institute of Occupational Safety and Health (NIOSH) New Dust Respiratory Protection Standard 42CFR84 announced on June 8, 1995 (based on filter media classification)
N series: protection of non-oily suspended particles
R series: protection of non-oily suspended particles and sweaty suspended particles
P series: protection of non-oily suspended particles and sweaty suspended particles
When the carrier of some particulate matter is oily, and these substances are attached to the electrostatic non-woven fabric, it will reduce the electrical property and allow the fine dust to penetrate. Purpose of dust.
So each series is divided into 3 levels: 95%, 99%, 99.97% (ie, 95, 99, 100 for short), so there are 9 categories of filter media.
(2) EU EN149 standard (test flow 95L / min):
FFP1: Minimum filtering effect> 80%
FFP2: Minimum filtering effect> 94%
FFP3: Minimum filtering effect> 97%
(3) Australian AS1716 standard (test flow 85L / min):
P1: Minimum filtering effect> 80%
P2: Minimum filtering effect> 94%
P3: Minimum filtering effect> 99%
(4) Japanese MOL verification standard (test flow 85L / min):
DS1: Minimum filtering effect> 80%
DS2: Minimum filtering effect> 95%
DS3: Minimum filtering effect> 99.9%
(5) CNS standards in Taiwan:
(6) Chinese national standard GB 2626-2006 is divided into four categories
The above inspection standards are tested with a particle size of 0.3 micrometers. The detection flow rate of the EU standard is 95L / min, and the US standard is 85L / min. 5L / min。 China's national standard with a suspended particle size of more than 90% <5 microns, more than 70% <2 microns, the flow value of 42.5L / min. In the filter material testing and certification, the "worst case" idea is adopted, that is, the conditions used in the laboratory for testing experiments are set to the worst conditions.
For example, the diameter of the aerodynamic sodium salt or DOP oil mist used in the efficiency experiment to calculate the diameter of the aerodynamic diameter of 0.3 microns, it represents the size of the extremely small and most easily penetrated filter material, Breathing volume during heavy physical labor. Before the experiment, the filter material must be pre-treated at high temperature and humidity, which represents a harsh working environment. The purpose of all these is to test if the filter material can pass the test under such harsh conditions Reaching the corresponding level of efficiency, then the workers' health will be more effectively protected in practical applications.