When we choose the right air respirator, especially the filter-type air respirator, there are many misunderstandings:
First, filter-type respirator only pay attention to the calibration of the filter efficiency, ignoring the actual filtering effect. Since the particles of welding fumes are very small, usually less than 1 μm, it is necessary to understand what kind of particulate matter is used in the product standard and detection method of the selected dust mask. Scientific research has proved that particulate matter of 0.3 μm is the most difficult to filter particle size of various filter materials. Therefore, particle sizes of these particles are generally used abroad to detect the filtering efficiency of dust masks and filter materials, if the efficiency can reach 95%. , then the filter is no matter whether it is greater than or less than 0.3 μm particles, the efficiency must be above 95%. Since China's current mandatory testing standards (LD 29-1992) have not yet used particulates of this size, the calibrated filtration efficiency of the dust masks tested does not represent the actual filtration efficiency of the filter welding fumes.
Second, filter-type air respirator only pay attention to the level of filtration efficiency, ignore the closeness of the respirator and the wearer's face. If it is not tight, harmful substances will directly enter the respiratory organs from the leak, and filters with high filtration efficiency will not work.
Thirdly, an exhaust device has been set up at the workplace of the filter-type respirator, and it is believed that individual respiratory protection is not required. Due to the characteristics of welding operations, the local environment of the worker's breathing zone is the location with the highest concentration of harmful substances. Even if the welding smoke can be discharged by the exhaust equipment, it can only avoid the spread of harmful substances and reduce the environmental concentration, but before the removal The harmful substances still pass through the person's breathing area, so individual respiratory protection measures must be taken.
Many welding operations are carried out in relatively confined spaces and are prone to oxygen deficiency. China has defined an atmosphere with an oxygen content of less than 18% as an oxygen-deficient environment. Filter-type respirator does not generate oxygen, and air-supply respirator protection equipment must be selected.
First, filter-type respirator only pay attention to the calibration of the filter efficiency, ignoring the actual filtering effect. Since the particles of welding fumes are very small, usually less than 1 μm, it is necessary to understand what kind of particulate matter is used in the product standard and detection method of the selected dust mask. Scientific research has proved that particulate matter of 0.3 μm is the most difficult to filter particle size of various filter materials. Therefore, particle sizes of these particles are generally used abroad to detect the filtering efficiency of dust masks and filter materials, if the efficiency can reach 95%. , then the filter is no matter whether it is greater than or less than 0.3 μm particles, the efficiency must be above 95%. Since China's current mandatory testing standards (LD 29-1992) have not yet used particulates of this size, the calibrated filtration efficiency of the dust masks tested does not represent the actual filtration efficiency of the filter welding fumes.
Second, filter-type air respirator only pay attention to the level of filtration efficiency, ignore the closeness of the respirator and the wearer's face. If it is not tight, harmful substances will directly enter the respiratory organs from the leak, and filters with high filtration efficiency will not work.
Thirdly, an exhaust device has been set up at the workplace of the filter-type respirator, and it is believed that individual respiratory protection is not required. Due to the characteristics of welding operations, the local environment of the worker's breathing zone is the location with the highest concentration of harmful substances. Even if the welding smoke can be discharged by the exhaust equipment, it can only avoid the spread of harmful substances and reduce the environmental concentration, but before the removal The harmful substances still pass through the person's breathing area, so individual respiratory protection measures must be taken.
Many welding operations are carried out in relatively confined spaces and are prone to oxygen deficiency. China has defined an atmosphere with an oxygen content of less than 18% as an oxygen-deficient environment. Filter-type respirator does not generate oxygen, and air-supply respirator protection equipment must be selected.
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