Self-suction filter dust respirator is the most widely used category in our daily work. The structure of a self-suction filter dust mask should be divided into two parts. One is the main body of the mask, which can be simply understood as a shelf of the mask.The other is the filter material part, including the filter cotton used for dustproof and chemical filter box used for poison prevention.Therefore, for the choice of self-suction filter type dust respirator, some products of Guangjia provide you with the following convenience: you can use the same type of mask, and when dust prevention is needed in the dust working environment, it is matched with the corresponding filter cotton, so that you wear a dust respirator;When it is necessary to prevent virus in a toxic environment, replace the filter cotton and install the corresponding chemical filter box, so that it becomes a respirator, or according to your work needs, provide you with more combinations.

Standard:

New National Institute of Occupational Safety and Health (NIOSH) Standards for dust respiratory Protection 42CFR issued June 8, 1995 (by filter classification)

N series: protection against non-oily suspended particles without time limit

R series: Protection against non-oily suspended particles and sweat oily suspended particles within 8 hours

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

The carrier of some particles is oily, and these substances attached to the electrostatic non-woven cloth will reduce the electrical properties, so that fine dust penetration, so for the oil-containing aerosol filter material to go through special electrostatic treatment, in order to achieve the purpose of preventing fine dust.Therefore, each series is divided into three levels: 95%, 99% and 99.97%(i.e. 95,99,100 for short), so there are nine small types of filter materials.

Eu EN149 standard:

FFP1: Minimum filtering effect "80%"

FFP2: Minimum filtering effect 94%

FFP3: Minimum filtering effect 97%

Australian AS1716 standard

P1: Minimum filtering effect "80%"

P2: Minimum filtering effect (94%)

P3: Minimum filtering effect "99%"

Japanese MOL Verification Standard

DS1:

DS2: minimum filtering effect "99%.

DS3: Minimum filtering effect "99.9%.

Chinese National standard GB6223-86UDC614.894: Divided into four categories

Testing way:

The above inspection standards are all based on particle size of 0.3 micron. The eu standard has a flow rate of 95L/min and the US standard is 85L/min.China's national standard suspended particle size & LT;Over 90% of 5 microns, <Over 70% of 2 microns, the flow value is 42.5L/min.The idea of "worst case" is adopted in the inspection and certification of filter materials, that is, the conditions in the laboratory are set as the worst conditions.When doing efficiency experiments, such as the ammoniation sodium salt or DOP oil mist of dust particle size of 0.3 microns diameter of gas dynamics calculation, it represents a very small and most easily through the filter material particle size, represents a strong engaged in physical labor in volume, even before the experiment to the pretreatment of high temperature and high humidity of filter material, on behalf of the poor working environment, all of these is the purpose of the inspection in such a harsh conditions, if the filter material can pass the test and the corresponding efficiency level, so in practice it can more effectively protect the health of workers.Antitoxic filter material is generally used activated carbon or chemically treated activated carbon as a material, through adsorption or chemical reaction will be gas or gas vapor filtration and is not inhaled.The internal structure of activated carbon has many micropores that can form a huge specific surface area. These micropores can absorb poisonous vapors and gas molecules of different sizes without escaping.The treatment and installation of activated carbon requirements are very high, if the improper treatment or activated carbon particles are very thick, and caused by the gap between the particles, then the gas will be penetrated into the respiratory tract from the gap, and will not be adsorbed.Therefore, it is very unscientific to replace the bagged activated carbon by yourself.In a good chemical filter box, the activated carbon should be packed with compactness, small particle size and large specific surface area, so that the anti-virus time can be longer, and the respiratory resistance should be small, so as to be comfortable to wear.Generally speaking, different types of chemical filter boxes can protect against different types of chemicals, such as organic, acidic, comprehensive poison, ammonia, etc