Impact testing, more commonly reffered to as Gmax testing, measure the shock attenuation of sports surfaces. This test can be carried out on both artificial and natural playing surfaces. Gmax testing is recognised throughout the USA and should be performed annually in order to ensure the safety of players.

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 state of the art ASTM F355 A-Missile to measure the gmax rating of a field, testing is carried out to test method ASTM F355 and to ASTM Standard F1936.