| 简介 |
PROBLEM TO BE SOLVED : To provide a silicon-based ceramic minus ion generating material radiating low-dose radiation and improving natural healing power of a person and to provide a footwear material using the same, an insole in particular, and manufacturing methods thereof.SOLUTION : This low radioactive minus ion generating material is mainly composed of the silicon-based ceramic and includes radioactive rare earth element containing mineral of 10-30 mass% and the footwear material retains the same. |
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