Brock Material and G-max Testing (ASTM F355)
The test below shows the differences in G-max rating when Brock is tested at various temperatures and under a variety of turf specifications.
Laboratory Report: Synthetic Turf Impact Tests
Test Date: 12/2003
Report Date: 1/15/2004
Client: Dan Sawyer, Brock USA
Methods
ASTM F355 Standard Test Method for Shock Absorbing Properties of Playing Surface Systems and Materials, Procedure A.
Reported scores are the average of the second and third of three impacts.
Samples
- Various combinations of in-filled synthetic turf with Brock underlayment pad
- Turf samples were 12' x 12" constructed in-house using manufacturers' standard formulations
Results
Comments
- The blue bars in Figure 1 show the effect of Brock underlayment on the peak shock of impact, determined as the gmax score of an ASTM F355-A impact test. On average, the Brock underlayment reduced g-max scores by 26%, relative to a concrete surface.
- According the ASTM Specification, a surface scoring less than 200 gmax is acceptable for use as a Football field. Typically, ambient temperature gmax scores of new installations are in the range 100-140g
