(1), the National Institute of Occupational Safety and Health (NIOSH) Dust Respiratory Protection New Standard 42CFR84 was published on June 8, 1995 (according to the classification of filter materials)
N series: protection of non-oily suspended particles
R series: protection of non-oily suspended particles and sweaty oily suspended particles
P series: protection of non-oily suspended particles and sweaty oily suspended particles
When the carrier of some particulates is oily, and these substances are attached to the electrostatic non-woven fabric, the electrical properties will be reduced, and the fine dust will penetrate. Therefore, the filter material for preventing the oil-containing sol must undergo special electrostatic treatment to achieve the small The purpose of dust.
So each series is divided into 3 levels: 95%, 99%, 99.97% (referred to as 95, 99, 100), so there are 9 small categories of filter materials.
(2), EU EN149 standard (test flow 95L / min):
FFP1: minimum filtering effect “80%
FFP2: Minimum filtering effect “94%
FFP3: Minimum filtering effect “99%
(3), Australian AS1716 standard (test flow 85L / min):
P1: Minimum filtering effect “80%
P2: Minimum filtering effect “94%
P3: Minimum filtering effect “99%
(4), Japan 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 microns. The EU standard detection flow rate 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% of less than 5 microns, more than 70% of less than 2 microns, the flow value is 42.5L / min. In the testing and certification of filter media, the “worst case” idea is adopted, that is, the conditions when the laboratory performs the testing experiment are set to the worst conditions.
For example, when the efficiency experiment is used, the particle size of the aerosol sodium salt or DOP oil mist is 0.3 microns, and it represents the diameter of the aerodynamic calculation. It represents the size of the very small and most easily penetrated filter material. The breathing volume during strong physical labor, the filter material is also pre-treated at high temperature and high humidity before the experiment, which represents a harsh working environment. The purpose of all of these is to test under such harsh conditions. Reaching the corresponding efficiency level, then in practical applications, it will be able to protect the health of workers more effectively.