Development of safety hygiene evaluation system of manufactured fiber material

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As for the asbestos, the use is prohibited now to cause lung cancer, the mesothelioma. The used asbestos substitutes has many things that safety does not become clear so that time is not long, and safety evaluation becomes urgent business now. In this study, we assumed RF3 class, RCF, RW2 class an investigation object material among synthetic fiber-shaped materials. As a result of having evaluated it by intratracheal instillation or inhalation exposure, as for the obstacle characteristics of a cell and lungs, few things were suggested.