GMAX Testing
Why GMAX Testing Matters
GMAX testing measures the shock attenuation performance of an artificial turf surface. As fields age, infill compacts, fibers wear, and surfaces become harder — and harder surfaces can increase the risk of impact-related injuries.
GMAX trend example
Field hardness over an 8-year lifecycle
Safe ≤165 Caution 165–200 Replace > 200
| Field age | GMAX reading | Zone |
|---|---|---|
| Year 1 | 102 G | safe |
| Year 2 | 118 G | safe |
| Year 3 | 135 G | safe |
| Year 4 | 148 G | safe |
| Year 5 | 161 G | safe |
| Year 6 | 178 G | caution |
| Year 7 | 192 G | caution |
| Year 8 | 206 G | replace |
Recommended best practice
GMAX testing at least twice annually.
Pair tests with documented maintenance and cleaning history to build a complete picture of field condition.
Benefits
What GMAX testing gives you
- Monitor field hardness
- Identify problem areas
- Track changes over time
- Improve player safety
- Support risk management
- Provide objective field performance data
Schedule GMAX Testing
Our certified technicians perform GMAX testing using ASTM-compliant equipment, with full digital reporting straight into your YourFieldIQ field record.