MIL-PRF-46103E
6.2 Acquisition requirements. Acquisition documents should specify the
following:
a. Title, number, and date of the specification.
b. Type and class of armor (see 1.2).
c. Issue of DoDISS to be sited in the solicitation, and if required, the
specific issue of individual documents referenced (see 2.2 and 2.3).
d. When first article is required (see 3.1).
e. Whether the material is to be specified (see 3.2).
f. Acceptable value for ballistic deformation, if different (see 3.4.2).
g. Acceptable value for areal density or armor assembly weight (see 3.4.3).
h. Specify location of identification markings (see 3.6).
i. Whether inspection is carried out by the contractor under Government
surveillance (see 4.2.1)
j. Number of samples to be inspected from the initial production lot (see
4.2.4).
k. Number of samples to be inspected from the production lots after the
initial production lot (see 4.2.5).
l. Acceptance requirements prior to shipment of the lot of armor, if
different (see 4.2.6).
m. Packaging requirements (see 5.1).
6.3
Definitions.
6.3.1 Areal density. A measure of the weight of armor material per unit area,
usually expressed in pounds per square foot (lb/ft2) or kilograms per square
meter (kg/m2) of surface area.
6.3.2 Ballistic deformation. The maximum momentary displacement of the back
surface of the armor test specimen caused by a fair hit that does not penetrate
the armor when the armor is in initial contact with the backing material.
6.3.3 Ballistic resistance. A measure of the capability of a material or
component to stop or reduce the impact velocity and mass of an impacting
projectile or fragment.
6.3.4 Complete penetration, (CP). A complete penetration occurs when the
impacting projectile, or any fragment thereof, or any fragment of the test
specimen perforates the witness plate, resulting in a crack or hole which
permits light passage when a 60 watt, 110 volt bulb is placed proximate to the
witness plate.
6.3.5 Contractor. The term "contractor" is defined as the organization having a
direct contract with the procuring activity.
6.3.6 Fair hit. A bullet that impacts the armor at an angle of incidence no
greater than +50 from the intended angle of incidence, no closer to the edge of
the armor part than 3 in. (7.6 cm) and no closer to a prior hit than 2 in.
(5 cm), at an impact velocity no more than 50 ft (15 m) per second greater than
the minimum required test velocity.
6.3.7 Manufacturer. The term "manufacturer" is defined as the organization
actually performing the operations covered by this specification.
6.3.8 Partial penetration, (PP). Any impact which is not a complete penetration
may be considered a partial penetration.
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