The test procedure is made up by three (3) runs, each of 10 000 bottles ("test" bottles) according to the following procedure:• 1st test : 10 000 bottles.• 2nd test : 10 000 bottles; 2nd test made 10 days from 1st test latest, provided the 1st test is valid (see test validation) • 3rd test : 10 000 bottles packed with milk which has been kept during 72 hours in the aseptic tank; 3rd test made then 72 h after the 2nd one.