For a table tennis rubber sponge layer to be used, a table tennis rubber and a table-tennis bat

摘要

In a for a table tennis rubber sponge layer to be used is a loss coefficient tan δ₇₀₀ the sponge layer at a frequency of 700 hz is equal to or smaller than 0,02, and is a change ratio of the loss coefficient of the sponge layer in a range of a frequency of 500 hz up to a frequency of 900 hz is equal to or smaller than 1,08.