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Synthetic In-fill: STMA

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Jason Sentell

on 22 January 2014

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Transcript of Synthetic In-fill: STMA

Infill Migration
Maybe someone told the infill the grass is greener on the other field?
Studies Show
Various studies show bell curve correlations in infill depth and surface hardness

This would also suggest that there is a safe "flexible" level of depth, with safety and performance concerns
Relief of compaction, overall grooming, and infill depth maintenance techniques.
Understanding Infill
and Compaction
Rubber Types
-Ambient Processing- Over 90% of rubber. Typically tires or other recycled rubbers. Ground in a mill. Tends to be less uniform, and jagged. It is considered ambient due to temps when processed.

Recycling & Revitalization

Gmax Comparisons

Metal & Other Debris

Post Installation Gmax Testing Standards

Initial Installation Standards

F 355 Testing Equipment

Present By: Chad Price, CSFM, CFB,
of Carolina Green Corp.

Synthetic Turf - Gmax

Why is Gmax Important in Sports?

ASTM F-1702 - Clegg
ASTM F-355 - Triax Missile System

Testing Devices for Gmax

Higher Gmax = Less absorption of force by the surface and more force
into athlete.

How much force is returned to Athlete?

How much force does surface absorb?

Gmax on Surface

G = ratio of acceleration of an object to the acceleration of gravity

G's are felt as weight or pressure.

Gmax =Maximum negative acceleration on impact, peak deceleration.

What is Gmax?

Other Maintenance Testing and Documentation
Gmax = Average of 2nd and 3rd drop

F1936 Testing Procedure = 3 successive
Drops on each test point (10 total)

F355 Test Method = 20lb. Flat Faced Missile
Dropped from 2 feet above surface to simulate
Impact energy in a football game.

ASTM F355 & F1936 for synthetic turf

How Gmax is tested

6 ft. from the back of the End Zone

6 ft. from the Goal Line

high wear area

high wear area

12 Yard Line

25 Yard Line

Center of the field

25 Yard Line

10 Yard Line

Goal Line

F 1936-10 Testing Locations

Deep cleaning will
will remove fiber dust
Evenly distribute infill
Stand fiber to upright

Breakdown of turf fiber
occurs over time with game
Excessive and aggressive
No maintenance program
Improper depth of infill

Lisport - Penn State’s
Center for Sports Surface
Turf ran10,000 cycle intervals
classified into one of four categories –
“Complete Splitting”.

Fiber dust, turf

Fiber degradation


Measuring Turf Wear

Presented by
Chad Price and Jason Sentell

2.25 kg
High school fields
Frozen practice field
Tiled, concrete basement floor
Carpet and pad on tiled concrete floor
Carpet and pad on hardwood floor
- The maximum Gmax value at time of installation should be in range of 120-180 G.
- The various Gmax values should not vary by more than 15G
- The maximum Gmax value throughout the warranted life cycle of the synthetic turf playing surface is not to exceed 200G. The HIC (Head Injury Coefficient) Value throughout the life cycle of the synthetic turf playing surface is not to exceed 1000.
Nine (9) tests will be required in total throughout the life cycle of the field
The first Gmax test will be conducted after the completion of the sports fields original construction period and before any play is to occur on the field
The future eight (8) testing requirements will be conducted within 21 days of the annual anniversary of the sports field completion throughout its entire eight (8) year warranty period.
Jason Sentell, Director of Sales & Marketing
STEC Equipment, Inc.
Compaction, Migration and Maintenance of In-fill
Synthetic In-Fill: Compaction and Advancements in relief options
Major Reasons for increases in Gmax
-Infill Migration
-Cryogenic Processing- approx 4% of rubber is suitable for this process. Rubber is ground and then they separated. The most round of the rubber is frozen and reground in a special mill. This process creates a very uniform granule.
-Silica Sand - Most common and is almost pure quartz
-Nut Shells
-Ethylene Propylene Diene Monomer

-Thermoplastic Elastomers
-Commonly Tan or Green
-Uniform or irregular
-Various colors, uniform shape
a brief overview from
Defined as a densification of a medium by removal of air and thus pore space.
Can be achieved by mixing of various particle sizes and adding other mediums or moisture content.
A study from Drs. Andrew McNitt, Peter J. Landschoot and Dianne M Petrukak found that ''infill depth did not affect surface hardness in dry conditions. Under wet conditions, the 38mm infill depth showed lower surface hardness values than the 25mm infill depth."
This means that environmental factors
such as moisture content can
add to compaction

In effect, infill is prone to migrate in several ways:

~walk off; literally carried off in cleats and uniforms
~Splash and fly out; infill is manually displaced during various maneuvers during a game or practice
~High use ares also manually displace infill
Maximum Safety and Performance

No affiliation;

Just a great video!
with permission of and thanks to
Sydney Squires, Astro Turf
Compaction Relief
Important for your
face AND your turf.

Well, not so much your face. You can
have a beard... really, I don't care.
In Summary
Stop thinking... "finally, it's over!"
Grooming, aeration and testing for quality is essential

Maintaining manufacturer specs and ASTM standards is
critical to the playability and life of your field

This requires maintenance to keep infill quality integrity
as well as depth and consistency
Averages don't tell the whole story; you
can have extremes in depth, cleanliness and
effectively Gmax across a playing surface
20 lb missile - simulates human head
Fiber fibrillation analysis
seam and inlay analysis
excessive wear areas
infill consistency and depth
infill migration
base stability
Gmax over 200 pose risk of life threatening head injuries.
In fill materials and
why they matter
Full transcript