FRAGMENTATION RESISTANT ARMOURS
Combat troops rarely suffer injury or fatality from bullets but are at high risk from primary (direct) and secondary (environmental) fragmentation. To combat these threats LBA International Limited has developed a special range of Fragmentation 'F' levels whose performance is measured by a V50 value.

FRAGMENTATION TEST (V50 TEST)
The V50 test is the internationally recognised standard for assessing the fragmentation resistance of personal protection. The fragmentation test is conducted using Fragment Simulating Projectiles (FSP's) which are available in a range of weights approximately following the binomial progression. The test is conducted by firing FSP's at the armour at increasing velocities until an average velocity of penetrating and non-penetrating projectiles is obtained. The higher the ballistic speed, measured in metres per second, the higher the rating of material, shown as V50 000m/s. The V50 (Velocity 50% or mean velocity) is the average of the velocities recorded for six fair impacts consisting of the three lowest velocities for complete penetration and the three highest velocities for partial penetration, provided the spread is not greater than 40 metres/second (STANAG 2920).



Frag level F1 F2 F3 F4 F5 F6
 
Minimum Fragmentation Velocity V50* m/s (ft/sec) 400
(1310)

450
(1470)
500
(1640)
550
800
600
(2000)
650
(2130)

*Tested using a standard 17 grain fragment, in accordance with STANAG 2920


STANDARDS  
US Standard - Mill STD 662 E NATO Standard - STANAG 2920
UK Standard - UK/SC/5449