GroGreen GEO GRID B 1200 125246 12.5' x 246' GGS 1200 Geogrid - GGS 1200 is an integrally formed biaxial geogrid made of 100% polypropylene. The load transfer mechanism is a positive mechanical interlock. GGS 1200 is primarily used for base reinforcement or subgrade improvement. GGS 1200 resists ultraviolet deterioration, rotting, biological degradation, naturally encountered basics and acids. Polypropylene is stable within a pH range of 2 to 13.