Permeation Degrees of Respirators and Concentrative Efficiency of Bacteriophage Capturing Materials

We measured permeation degrees of three different types of respirators by using an original testing system. The first type of respirator is a non-woven mask constructed from three layers of one thick non-woven fabric sandwiched by two thin non-woven fabric and bacteriophage permeation degree is 10 percent. Second, particulate respirator (N95) does not permeate any of bacteriophage. Lasty, its permeation degree of the gauze mask layered 9 of double sheet gauzes is 56 percent. Everything of these respirators hesitated comfortable breathing. The respirator comfortable breathing and preventable permeation of virus is hoped in the future. We used four different kinds of activated carbons and each charcoal crushed after carbonizing five kinds of woods to analyze materials that works effectively for bacteriophage capturing. The high capturing percentages were showed in an activated carbon and in each crushed charcoal of particle size of 0.1-0.3 mm carbonized Japanese cedar, Pine or Japanese oak. The reason why the higher capturing effectiveness was gained in these crushed charcoals was estimated by measuring of the pore volume and specific surface area with the big size, and the specific construction of the particle surface by the scanning electron microscope (SEM) pictures. Especially, the 0.1-0.3 mm size charcoal of Japanese cedar is light-weight, and will produce superior effectiveness of the capturing in small volume, the 5 mm layer of the material in the holder could maintain highly the capturing percentage in long time test of capturing too. The same charcoal of 0.1-0.3 mm size will be used for virus capturing material for the new type mask.