The alpha ring filter LAS-51C (for dust mask 1180C) (Koken) is an alpha ring filter made by integrally forming ultra-fine diameter glass fibers into a round pleat shape to enable high collection efficiency and long-term use. By adding advanced processing technology to this alpha ring filter, we have expanded the filtration area to a maximum of about 12 times the bottom area, enabling even higher collection efficiency and longer use. The alpha ring filter has been treated to be water repellent since the beginning of development, so even if liquid such as mist or moisture adheres, it will not be difficult to breathe, and it is effective against mist and oil mist. . There are also products that have undergone flame-retardant processing against spatter sparks. Koken LAS-51C, Filter Koken LAS 51C, Cartridge Koken LAS 51C, Koken dust absorption , masker pernapasan koken LAS 51C