Q1. What is a regulation soccer ball?
Between 430 and 445g in size 5
Between 68.5 and 69.5 cm.
Average measured variation: a maximum of 1.5%. We measure football's sphericity at 16 different points and examine the recorded discrepancies. If the discrepancy is greater than 1.5% (FIFA PRO Standard), our engineers are tasked with improving the sphericity to ensure a consistent bounce.
Maximum pressure loss:
We inflate the ball to the recommended pressure (meaning 0.8 bar). 72 hours later, the ball must not lose more than 15% of its pressure, meaning approx. 0.1 bar. The pressure after 72 hours must, therefore, be at approx. 0.7 bar. This also means that it is quite normal for a ball to lose pressure after a few days.
We simulate rainy playing conditions in a lab by leaving the ball to sit in 2cm of water on pivoting support whilst subjecting it to 250 compressions At the end of the test, the ball can not have absorbed more than 10% of its weight, 40 grams for the F900. This is one of the advantages of the thermobonded process; water absorption is limited in comparison to other processes (machine-stitched for example)
Between 135 and 155 cm with a maximum difference of 10 cm between the ball's highest and lowest bounce. Each ball is dropped 10 times on a steel plate from a height of 2 metres. The bounce obtained with the F900 ball complies with FIFA Pro requirements.
Q2. Which gas is filled in ball?
Air is filled using hand pumps in a standard football.