Natural slate ore is one kind of sedimentary rock and formed from shale by metamorphism. Slate had been used as building stone because it is hard, fine and strong ore, and it has a characteristic of the cleavage. On the other hand, in north part of Japan during the winter season, in order to ensure a safety driving on the frozen roads the use of non-skid powder is required. A large amount of CaCl_2, NaCl, KCl, etc. are used as reagents and are scattered on the frozen roads during the winter to melt the snow resulting to a high cost. In this study, the non-skid powder for the frozen road by was developed using natural slate. Primarily, the contact angle and zeta potential of slate and other reagents were measured. Secondly, the properties of the coefficient of static friction and dynamic friction in case of using slate (1.5-4.5 mm, aspect ratio: 1 to 3) mixed with some reagents were investigated. Regarding to experimental results, it was obvious that the nonskid powder created as a mixture of natural slate ore and CaCO_3 5 wt percent stick easily to the frozen road and exhibit the highest skidless performance.
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