The set of filters that make up a filtration system is strictly dependent on the type of processing and the type of materials being processed. Therefore, when selecting them, it is best to consult experts in the field of filtration of contaminants generated in laser processing. Nevertheless, it is useful to know the basic principles in the division of filters and their usefulness in different types of processing.
Thus, as a standard, pre-filters and HEPA-type primary filters are used in devices that filter contaminants generated during the laser process. This set can be successfully used for processing all metals and inorganic materials. However, in the processing of plastics and other organic raw materials, it is necessary to additionally include an activated carbon filter, which captures the aforementioned process gases with the smallest particle diameter. This filter, in the case of ULT brand equipment, is either mounted in a single cassette with the HEPA filter or, in larger systems, as a separate filter cassette. On the other hand, in spark-generating applications, such as laser welding, an additional spark filter will prove indispensable, which captures sparks, preventing them from reaching other filters and causing uncontrolled ignition of the filtered mixture. After all, it should be realized that in the filtration process, both impurities stored on the filters and the filtered gas mixture itself, circulating through the system at high speeds, can be flammable.