But Camenzind counters: «Optics also comes into play here. Telstar 18 is a strange, fluttering copy, claim goalkeepers of various World Cup teams who have already been allowed to test the ball. Likewise, most of the traditional leather has given way to plastics, the surface of which is specifically textured, which should enable the ball to be guided more easily, especially when the field is wet.Īnd it is precisely this surface that is responsible for the unpredictable flight of the ball, critics report.
Today's balls are glued or welded, because traditional seams could give way over time. Some leather balls had increased in size considerably after the procedure or absorbed too much water.
#Radioeins die profis series#
When the test series were introduced, not all manufacturers succeeded in achieving the required properties: «Time and again, specimens failed, » recalls Camenzind. Such standards also determine the quality and consistency of the sport. And finally, the ball must retain its shape even if shot against a steel wall 2’000 times at 50 kilometers per hour.
To prove that it is a perfect sphere, the ball is also measured at no less than 4’000 points. In addition, despite being crushed 250 times in a water tank, it may only absorb a minimal amount of liquid, must be able to hold its air and always jump off at the same height when it impacts from a height of two meters. It is not only the circumference and weight of the ball that are measured precisely. On behalf of FIFA, Empa has been conducting the incorruptible series of tests on footballs striving for the FIFA quality program's seal of approval for 22 years.
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