Concentric Security's vehicle barriers have been tested and found to meet all criteria for the certification standards indicated below.

Model	Certification	Weight / Speed	Penetration
GS-05-400	K4 / L2	15,000 lbs / 40 mph	38"
GS-05-430	K4 / L2	15,000 lbs / 40 mph	38"
GS-05-712	K1.1 / L3	10,000 lbs / 18 mph	18"
GS-05-714	K1.1 / L3	10,000 lbs / 18 mph	18"
GS-05-B-30	K8 / L1	15,000 lbs / 40 mph	Less than 50'
GS-05-820	K12 / L3	15,000 lbs / 50 mph	Zero Penetration
GS-05-890	K1.2 / L3	4,000 lbs / 30 mph	Zero Penetration

For comparative purposes, barriers which were physically tested to either U.S. Navy or U.S. Marshall Service specifications have been converted to an equivalent Department of State rating.

K and L ratings are established by Department of State test procedures in accordance with standard SD-STD-02.01. This standard specifies a vehicular impact (perpendicular to the barrier) of a 15,000 pound vehicle at a speed of 30, 40, or 50 mph.

K-ratings are based on the kinetic energy of the vehicle during impact. This energy can be calculated using the equation:

KE = 1/2 x m x v²

where: KE equals kinetic energy, m equals the mass of the vehicle, and v equals the vehicle’s velocity on impact.

The calculated energies are then assigned representative standard numerical values to represent their magnitude.

The K-rating criteria are set forth as follows:

K4 – 15,000 pound vehicle traveling at 30 mph

K8 – 15,000 pound vehicle traveling at 40 mph

K12 – 15,000 pound vehicle traveling at 50 mph

L-ratings are used to indicate the actual penetration of the vehicle beyond the barrier, for a given K-rated impact.

Following an impact test, penetration of the vehicle beyond the barrier is measured to determine the resulting L-rating. Should the penetration exceed 50 feet, the barrier must be retested at a reduced K level. If the penetration is less than 50’, the barrier can be rated at that K-rating and assigned an appropriate L-rating.

The L-rating criteria are set forth as follows:

L1 – Resulting penetration 20 to 50 feet

L2 – Resulting penetration 3 to 20 feet

L3 – Resulting penetration less than 3 feet

Back to Vehicle Barriers