Gmax testing is now considered to be an imperative test to demonstrate the safety of your field.

Gmax shows the magnitude of force during an impact. A surface with high Gmax measurements absorb less force, therefore a player colliding with the surface will sustain more force upon impact, increasing the likelihood of injury.

Surface Performance use a ASTM F355 A-Missile Measurement Tester to calculate Gmax values. There is a accelerometer inside the 20lb missile, upon impact it measures the impact attenuation of the playing surface.

Gmax testing is recognised throughout the USA and should be performed biannually in order to ensure the safety of players.