Il pallone ufficiale per i Mondiali di calcio 2018 in Russia è stato approvato dall'EMPA, il Laboratorio federale svizzero per la scienza e la tecnologia dei materiali, dopo una serie di test rigorosi.
L'EMPA testa i palloni per la FIFA da 22 anni, e non tutte le palle superano il test. Nonostante alcuni portieri abbiano criticato le caratteristiche di volo della palla, l'Adidas "Telstar 18" ha ottenuto il sigillo di approvazione.
Secondo l'EMPA, non è solo la circonferenza e il peso della palla che vanno misurati con precisione. Pur essendo immerso 250 volte in un serbatoio d'acqua, la palla deve assorbire solo una minima quantità di liquido, deve essere in grado di trattenere l'aria e rimbalzare sempre nello stesso modo quando cade da un'altezza di due metri. Per dimostrare che è una sfera perfetta, la palla viene misurata su 4'000 punti. Infine, deve mantenere la sua forma anche se sparata contro una parete d'acciaio 2’000 volte a 50 chilometri all'ora.
EBU/Bleff
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