What is GMAX?

GMAX It is the hardness and shock absorption properties of a turf field. It is a measurement of deceleration that relates to the maximum force of a collision.

GMAX is a measurement of the magnitude of force during an impact. A surface with a high GMAX absorbs less force, and therefore the object colliding with it sustains more force upon the impact. When an athlete falls on the turf surface, the impact is absorbed by the playing surface itself, and the player’s body part that is impacting the turf.  The harder the surface is, the greater the force the athlete must absorb, which increases the chances of injury.

Chenango utilizes a Triax 2000 A – Missile, and tests fields using the ASTM F355 testing method. There are multiple benefits of testing a field’s GMAX such as ensuring your athletes are playing on a safe field, and it allows our technicians to tailor a maintenance program to get your field performing at the optimal levels again.  Chenango is proud to offer GMAX testing for your playing surface, and provides our clients with a full report of the results of the test.

GMAX Facts:

  • Pile weight of turf does not affect it
  • Both sand and rubber portions of infill affect the value
  • GMAX values decrease as infill weight increases
  • Lightweight infill systems have a higher value than heavyweight infill systems
  • FieldTurf’s patented 3 layer system provides athletes with the most infill volume and weight
  • FieldTurf systems are designed to provide typical values of 115 – 165
  • Regular field maintenance can help lower a field’s value

For additional info visit The Penn State Center for Sports Surface Research’s article on understanding GMAX testing.

GMAX Testing