The purpose of this study is standardization of substances adhered to floors as standard testing conditions of slipperiness of floors. First, we grouped actual substances into four classes. In case of "sand and dust" and "mud and water", we measured the actual quantities and Coefficient of Slip Resistance (C.S.R) of them on floors. Next, we considered several substitutes of them, and measured C. S. R of the substitutes on floors. In case of "oil" and "washing agents", we selected typical substances and measured C.S.R of them on floors. Finally, we presented standard substances and their standard quantities from the viewpoint of safety.
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