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BS 5051 1988

Bullet-resistant glazing. Specification for glazing for interior use.

1. Designation System

In considering the various types of potential attack against which bullet resistant glazing may be required to provide protection, it has been found convenient to define six categories of glazing, to be designated by code letters and numbers. (see clause 3)

2. General Requirements

The first requirement for bullet resistant glazing is that it will provide protection by preventing the passage of projectiles from various types of weapon. The second requirement is that it will protect personnel against injury from splinters of glass which may be ejected from the rear surface when glazing is attacked. Because of the need to comply with this second requirement, the glazing may be either unitary type or duplex type in which a primary screen stops the bullet and a thin, secondary screen stops the flying splinters. In a duplex installation the secondary screen is permanently fixed, for example by hanging on chains from the ceiling, and is not necessarily attached to the main screen.

Table 1. Conditions of test for panels
Class Type of Weapon and Calibre *1 Ammunition *3 Strike Velocity m/s *2,4 Test Range Minimum (m) Number of strikes Pattern of strikes

* NOTES:

  1. With the exception of class S86, the tests are sometimes conveniently carried out not with the specified weapons, but with ballistic testing equipment that produces striking velocities given above, which are slightly higher than would result from commercially available weapons
  2.  

  3. Suitably accurate systems of velocity assessment are now commercially available. In general the equipment does not measure velocity at a point, but rather the average velocity over a reference distance. By various methods the time taken for the bullet to travel through the reference distance is measured electronically, enabling the average velocity over the distance to be obtained directly or by simple evaluation.
  4. Attainment of the specified striking velocity requires the use of specially selected ammunition
  5. If the upper limit for the specified striking velocity is exceeded during test, but the test piece meets the criteria for compliance for its class, it is deemed to have withstood the specified level of attack.
  6. Having regard to the test range, for classes R1 and R2 in particular, for safety reasons it is strongly recommended either to install a system of remote firing of the weapon or provide sufficient protection for the operator.
G0 Hand Gun 9 mm parabellum 9 mm MK 2Z standard

390 +30-0

3 3 Centres 100 +10-0 mm apart forming an equilateral triangle within a square of 200 mm side located centrally on the test piece.
G1 Hand Gun 357 Magnum Soft point semi jacketed, flat nose, 10.2 g (158 gr) bullet 435 +30-0 3 3
G2 Hand Gun 44 Magnum Soft point semi jacketed, flat nose, 15.6 g, (240 gr) bullet 456 +30-0 3 3
R1 Rifle (1-7 twist) 5.56 mm NATO standard 5.56 mm ball (SS 109) 919 +30-0 10 *5 3 Centres 100 +20-0 mm apart, forming an equilateral triangle within square of 200 mm side located centrally on the test piece.
R2 Rifle 7.62 mm NATO standard 7.62 mm ball 815 +30-0 10 *5 3
S86 12 Bore Shotgun 12 Bore solid lead slug Mass 28.35 g (1oz ) 406 +40-0 10 1 Centre of point of impact as near centre of test piece as possible and within a circle of radius 100 mm located centrally on the test piece.