English
The positions of coal mining excavation and transportation, building polishing and mixing, stone cutting, sandblasting and polishing often have inhalable dust suspended in the air. Long term exposure to such dust is one of the main causes of pneumoconiosis, and daily respiratory protection is a fundamental occupational health measure.
Select level according to environment: According to GB 2626-2019 "Respiratory Protection Self priming Filter Anti particulate Respirators", KN class is used for non oily particulate matter, and the filtration efficiency is divided into KN90 (≥ 90%), KN95 (≥ 95%), and KN100 (≥ 99.97% for 0.075 μ m particles). Fangdun's products include disposable face masks, such as F9501/F9502 foldable KN95 dust masks, which are ready to use and suitable for low to medium concentration and intermittent dust operations such as wall polishing, sawing, bagging, and tile cutting; The replaceable half face mask, such as the 1105 series (1105K easy buckle type, 1105C through type), has a reusable body and is paired with KN100 filter cotton such as 2102N, making it more suitable for high concentration or ultrafine dust environments such as mines, stones, tunnels, etc. If there are organic gases present on site, a corresponding type of filter box can be installed on the half face mask; For enclosed spaces with unknown oxygen or harmful gas concentrations, filtering equipment is not suitable and isolated respirators should be used instead.
Pay attention to three practical parameters: ① The filtering level and LA certification number should be clearly marked on the packaging and body, which can be verified on the official website of the "Special Labor Protection Equipment Safety Mark Management Center"; ② Respiratory resistance affects the comfort of long-term wearing. The nominal inspiratory resistance of Fangdun half mask is about ≤ 20Pa, and the expiratory resistance is about ≤ 50Pa (please refer to the product manual and actual test report for details); ③ The degree of fit determines the actual protective effect. The 1105 series adopts a food grade liquid silicone cover and ergonomic design, equipped with an adjustable headband; The filter cotton is a three-point buckle that can be used with most brands. The 6102 also has a single-sided visible window for easy observation of the filter cotton status.
Strict wearing and frequent replacement are effective: Before wearing, check whether the cover, valve plate, and filter cotton are intact; After wearing it, perform a self check for air tightness - block the air inlet for inhalation, the cover should have a slight collapse and no obvious air leakage sound, and facial hair may affect the tightness. If there is a significant increase in respiratory resistance, discoloration or damage to the filter cotton, or odor during homework, evacuate to a ventilated area and replace the filter. It is generally recommended to wear it continuously for no more than 8 hours, and replace the filter cotton every shift in high dust environments; The main body of the mask should be wiped with a neutral cleaning agent, stored dry, and can be used for a long time without damage. Dust masks are just one part of comprehensive protection, and they also need to be accompanied by watering, ventilation, dust removal, and regular occupational health checks.
