Find the most up-to-date version of ASTM F at Engineering Penn State’s Center for Sports Surface Research. How is Gmax tested? • American Society for Testing and Materials. (ASTM). – Synthetic Turf. • F • F Buy ASTM F TEST METHOD FOR IMPACT ATTENUATION OF PLAYING SURFACE SYSTEMS, OTHER PROTECTIVE SPORT SYSTEMS, AND .

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Sports Surface Testing Machine

By partnering with leading testing facilities and universities around the world, Brock has been able to push the safety standards for the artificial turf industry forward. According to the Penn State Center for Turfgrass Science, impact attenuation of a playing surface is measured by an accelerometer mounted inside the missiles, that indicates surface hardness and is reported as Gmax. The Gmax test essentially aastm how fast the drop missle stops.

The higher the g-max value, the astn the shock-attenuation performance of the surface. Measuring impact-attenuation is a fundamental tool of athletic field safety testing.

Impact Machines: Sports Surface Testing Machine / standard ASTM F, F, F

It is also useful in assessing the playability of a field. The GMax of a field is determined by dropping the missile 3 times in the same location and averaging the second two drops. It requires the missile to be dropped in a minimum of 10 locations around the field. It is possible, and quite common, to have areas of the field with very high Gmax scores, while other areas such as sidelines with low Gmax Scores, so the field average may pass, yet have areas that would be considered unacceptable.


GMax is one benchmark at which to rate each field. This test simulates impact attenuation of a playing surface. Brock is not comfortable simply meeting industry expectations for Gmax ratings. Our standard for a field with Brock is pristine natural grass, because that is the surface that every athlete would rather play on.

GMax Test – Brock International

But there are three main reasons fields get hard over time when installed directly over stone: Hours of use, climate, and maintenance or lack thereof. But even considering these factors, a Brock field will consistently meet the ranges of r355 grass. There are three measurements used to characterize safety and performance of a surface. HIC is the internationally recognized test standard for head injuries. It drops a 10 lb hemispherical impactor from increasing heights to determine Critical Fall Height.

The higher the Critical Fall Height, the more protective the surface is f55 head injuries.

This test simulates the heel strike of an adult running athlete in stride. This is the softness or hardness under foot during f3555. Which is why quality natural turf is the benchmark for quality artificial turf.


The original shock pad system that set all industry standards for artificial turf fields. PowerBase Pro provides the ideal balance between shock absorption and field stiffness for elite athletes and is the only product engineered for NCAA, Pro and elite level players.

Smaller bodies need a different adtm than the pros! It comes in different thicknesses to optimize safety for the turf you select.

ASTM F355 – 16E1

This is our playground product. For use under artificial turf. The safety of the playing surface only degrades over time.

A moderate head injury consists of a loss of consciousness, where a major head injury results in a skull fracture!

Put into perspective, the impacts forces allowed on an artificial turf surface are somewhat ludicrous. Bringing the allowable GMax thresholds back to within reasonable limits is the current direction for most field designers and owners. And for good reason. Beyond The G-Max Test: All are considered concussions. Aetm for Full Story.

Reduce risk of injuries by putting performance safety layers under the field.