| 摘要 |
PROBLEM TO BE SOLVED: To provide a sound insulation sheet of high specific gravity and thin thicknsess by mixing metal powder in asphalt. SOLUTION: This invention is characterized in that the diameter of metal powder and the amount thereof to be mixed are considered, wherein 80 to 96 wt.% of metal powder whose average diameter is 5 to 100μm is mixed in 4 to 20 wt.% of asphalt.
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