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From disposable masks to replaceable filter cotton half masks, the choice of respiratory protection is often not about "the higher the level, the better", but about the matching between particle types, operating hours, and respiratory resistance. As a manufacturer of protective masks and face shields, Fangdun's product line revolves around this logic, and the parameter settings also point to specific work scenarios.
The KN95 disposable mask, represented by F9501, complies with the GB 2626-2019 standard and has a filtration efficiency of not less than 95% for non oily particles. It intercepts particles with a particle size not exceeding 0.3 microns. The ear strap structure, combined with adjustable nose bridge strips and 3D cutting, is suitable for low to medium concentration dust environments such as daily dust prevention and light polishing. If the homework site is mainly composed of non oil particles such as coal dust, silicon dust, cement dust, etc., KN100 grade filter elements provide higher filtration efficiency - the filtration efficiency of 2102N and 2202N for non oil particles above 0.075 microns is not less than 99.97%, the filter cotton diameter is 105 millimeters, and a concentric three-point buckle design is used. There is no need to distinguish angles during installation. In high dust concentration environments, the continuous use time of this type of filter cotton can exceed 30 days, provided that the respiratory resistance has not significantly increased and the filter cotton has not accumulated dust or discolored.
When homework requires a more stable facial fit or lower respiratory resistance, the 1105 series hood is made of food grade liquid silicone, with components made of ABS material. The hood weighs approximately 125 grams, with a nominal inhalation resistance of about 20 Pa and an exhalation resistance of less than 50 Pa. Some models are equipped with reduced resistance valve seat technology, which further lowers the expiratory resistance to below 35 Pa. The mask body does not have filtering function and needs to be used with filter cotton or filter box; After wearing, a negative pressure self check should be performed. Use your palm to block the air inlet for inhalation. If the cover slightly collapses and there is no air leakage, it indicates good sealing. The continuous wearing time generally does not exceed 8 hours, and the filter cotton should not be washed with water to avoid damaging the electrostatic adsorption layer.
The significance of parameters from masks to face shields lies in their corresponding scenarios. Fangdun's products cover two filtration levels, KN95 and KN100, and offer both disposable masks and semi face mask forms with replaceable filter cotton. When selecting, first confirm whether the particles on site contain oily components - KN level is for non oily particles, while KP level only covers oily and non oily mixed scenarios. On this basis, the specific model can be determined based on dust concentration, wearing duration, and respiratory resistance requirements, which is closer to actual protection needs than simply comparing price or grade labels.
