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*corp ITF TB 03/01ITF Approved Tennis Balls - Test Method ITF TB 03/01 - iv. Deformation
The official Rules of Tennis requires that any ball which is to be considered for use in any tournament which is played according to the Rules of Tennis, shall be named on the official list of balls which have been tested and approved as conforming to the specifications laid down in the Rules of Tennis and as issued by the International Tennis Federation (ITF). iv.Deformation. Test once on each axis and record the results. Report the mean value, and the maximum difference between the three readings, for each ball. The test measures the deformation of a ball under a load of 80.07 N (18.00 lbf) after a small initial load, of 15.57 N (3.50 lbf), has been applied to compress the fabric cover material. The ‘deformation’ is measured in two senses: a. When the load is first applied (“forward deformation”). b. Under the action of the load prior to it being removed and after the ball has been compressed further through a total distance of 2.54 cm (1.0 inches) (“return deformation”).