STF P11 geogrid is composed of polypropylene resin which is extruded into a stable geogrid structure. STF P11 geogrid is inert to biological degradation and resistant to naturally encountered chemicals, alkais, and acids.

STF P11 geogrid increases roadbed and foundation bearing capacity, while prolonging the service life of each by the confinement of the base course. STF P11 prevents lateral spreading of the base or sub-base aggregate and allows for shear interaction to develop between the aggregate and the geogrid.

STF P11 geogrid reduces the applied vertical pressure of heavy loads at depth of aggregate by spreading the load over a wider area, commonly known as the “snowshoe effect”.

Mechanical Properties Test Method  Unit Minimum Average Roll Value
 Ultimate Tensile Strength1  ASTM D 6637  lbs/ft (kN/m)  850 (12.4) 1300 (19.0)
 Tensile Strength at 2% 1  ASTM D 6637  lbs/ft (kN/m)  280 (4.1)  450 (6.6)
 Tensile Strength at 5%1  ASTM D 6637  lbs/ft (kN/m)  580 (8.5) 920 (13.4)
UV Resistance ASTM D 4355 % strength retained 100%
Junction Efficiency2 % 93
Flexural Stiffness3 mg-cm 250,000
 Aperture Stability4 m-N/deg 0.32
Resistance to UV Degradation5 % 100
Physical Properties Unit  Typical Values
Rib Thickness in (mm) 0.03 (0.76) 0.03 (0.76)
Aperture Size (MD) in (mm) 1.0 (25.4)
 Aperture Size (CMD) in (mm) 1.3.(33.0)
Roll Size (width x length) ft (m) 13.1 x 246 (4.0 x 75)
Roll Area yd2 (m2) 358 (300)

1True resistance to elongation when initially subjected to a load determined in accordance with ASTM D 6637 without deforming test materials under load before measuring such resistance or employing “secant” or “offset” tangent methods of measurement so as to overstate tensile properties.

2Load transfer capability calculated as a % of ultimate tensile strength

3Resistance to bending force determined in accordance with ASTM D 5732. The overall Flexural Stiffness is calculated as the square root of the product of MD and CMD Flexural Stiffness values.

4Resistance to in-plane rotational movement measured by applying a 20kg-cm (2 m-N) moment to the central junction of a 9 inch x 9 inch specimen in accordance with U.S. Army Corps of Engineers Methodology for measurement of Torsional Rigidity.

5Tested according to ASTM D 4355.