SYNTHETIC TURF
in the Field . ASTM F1936 states that the maximum limit for a playing surface is 200 Gmax using Missile A . According to ASTM , values of 200 Gmax and above are values at which life-threatening head injuries may be expected to occur . STC recommends Gmax not exceed 165 Gmax for the life of the field when using the F355 Missile A device .
The National Football League uses the F355 Missile D device , typically referred to as the Clegg Impact Tester ( ASTM F1702 ). If any location on the field measures above 100 Gmax using the Clegg , steps must be taken to reduce
surface hardness and the field must be re-tested prior to use .
World Rugby uses the F355 Missile E device to measure head injury criterium ( HIC ) on synthetic turf . To meet World Rugby standards , a synthetic turf field must measure below 1,000 HIC from a 1.3 m drop height .
Typically , the most effective way to mitigate surface hardness issues is the application of additional infill ( i . e ., crumb rubber ) via topdressing and grooming . Infill depth should be regularly monitored to maintain the manufacturer ’ s suggested minimal depth .
Larry H . Miller Field at Brigham Young University . Photo by John Kmitta .
32 SportsField Management | April 2023 sportsfieldmanagementonline . com