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POSTAPPROVAL TREATMENTS ON THE SPONGE IS A GROSS ILLEGALITY.
Aside from manual rubber treatment by players, another illegal treatment of the sponge layer is the factory tuning. In fact, factory tuning is a 'postapproval alteration to the rubber' as now being done in large by Chinese DHS manufacturer, and it is now prohibited by the ITTF Rubber Regulations T4, effective of January 2018.