Testing that gives facilities teams a clearer picture of surface impact attenuation.
GMAX is a measure used in field impact-attenuation testing. ASTM F1936 establishes an in-situ field test method and performance requirement for turf playing systems. STMG can coordinate qualified testing providers where specialized or independent execution is appropriate and help facilities teams connect the results to maintenance planning.
Signs this service may be needed
A testing interval in an owner program, localized firmness concerns, meaningful changes in infill condition or a request for documented impact-attenuation data.
What STMG evaluates
GMAX testing is relevant when an owner needs documented impact-attenuation information for a field baseline, maintenance review, specification or risk-management process. Values can vary across a field, especially where use, infill distribution and compaction differ.
Typical process
STMG can coordinate qualified testing providers for GMAX testing as part of a broader synthetic-field inspection and maintenance program where specialized or independent execution is appropriate. The resulting data can be incorporated into field-condition reporting and maintenance planning.
Specify the standard, test provider and deliverable before work begins.
For GMAX work, the scope should state the applicable test method or owner requirement, who is qualified to perform the testing, how test locations will be documented, what report will be delivered and how any outlying results will be handled. STMG can help organize the field information and maintenance follow-up while qualified testing partners perform standardized work where required.
Relationship to other field care
Testing does not prove that injuries cannot occur, and a single number should not be treated as a complete field-condition assessment. Results are most useful alongside field history, maintenance records, infill condition and visual inspection.
The service can be scoped independently or connected to inspection, corrective work and a recurring program when the field evidence supports that approach.
Documentation
The field file should identify the test method, field and test locations, provider, date, report and any maintenance performed afterward. Results are interpreted with infill, wear, seams, drainage observations and field history rather than in isolation.
Who uses this service
Athletic directors, facilities teams, school districts, universities, municipalities and sports-complex operators may request GMAX testing when objective field data is needed.
Frequently asked questions
What indicates a need for gmax testing for synthetic turf fields?
A testing interval in an owner program, localized firmness concerns, meaningful changes in infill condition or a request for documented impact-attenuation data.
Can this work be combined with an inspection?
Yes. An inspection can establish the field condition and define whether gmax testing for synthetic turf fields should stand alone or be paired with other maintenance.
Will STMG review manufacturer guidance?
Available field-system, warranty and manufacturer maintenance information should be reviewed before selecting methods or compatible materials.
What documentation may be provided?
The field file should identify the test method, field and test locations, provider, date, report and any maintenance performed afterward. Results are interpreted with infill, wear, seams, drainage observations and field history rather than in isolation.