It is a one of the serious problem that unhealthy influences upon human life by fungus and aphides growing inside dwelling and hospital. Vinyl cloth in hotels dwelling and hospitals that were covered on the wall and ceiling and emulsion paintings were used in food industries and clean room are susceptible fungus growth. Fungus inside the house and hotel were discussed.

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Chemical and mechanical changes in outdoors exposed nylon 6 films were examined. The films with ca. 50 % and 25 % crystallinities exhibited the same changes in the molecular weight, molecular weight distribution, and UV spectrum, suggesting that crystalline and amorphous regions of the outdoors exposed nylon 6 degrade in a similar way. This may be because the amorphous region of nylon 6 under the outdoor weathering is in a glassy state. On the other hand, the elongation at break of the high-crystallinity film decreased more rapidly than that of the low-crystallinity film, because the former would have less tie molecules. In the film thickness range between 50 and 150 p m, the changes in the molecular weight, UV spectrum, and tensile strength were independent of the film thickness, while the elongation at break for a thicker film tended to decrease more slowly.

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