MIL-PRF-46108C
3.5 Optical.
3.5.1 Luminous transmittance and haze. Requirements for luminous transmittance and haze shall be as specified
by the procuring activity (see 6.2).
3.5.2 Optical deviation. Requirements for optical deviation shall be as specified by the procuring activity and the
optical deviation shall be defined and measured (see 6.2).
3.5.3 Optical distortion. Requirements for optical distortion shall be as specified by the procuring activity and
the optical distortion shall be defined and measured (see 6.2).
3.5.4 Birefringence. Requirements for birefringence shall be as specified by the procuring activity and the
photoelastic measurements of birefringence and residual strains shall be determined for the transparent plastic
materials used in the armor construction (see 6.2).
3.6 Environmental resistance. The transparent armor shall not crack, cloud, delaminate, or show any other
evidence of deterioration when tested for environmental resistance. Additional requirements for the
environmental resistance of the transparent armor shall be as specified in the engineering drawing, detailed
specification or contract in accordance with MIL-STD-810 for the following environmental conditions:
a.
Low pressure (altitude)
b.
High temperature
c.
Low temperature
d.
Temperature shock
e.
Solar radiation (sunshine)
f.
Rain
g.
Humidity
h.
Fungus
i.
Salt fog
j.
Sand and dust
k.
Explosive atmosphere
l.
Leakage (immersion)
m.
Acceleration
n.
Vibration
o.
Acoustic noise
p.
Shock
q.
Gunfire
r.
Temperature, humidity, vibration, altitude
3.7 Allowable defects. For inspection purposes, the transparent armor is divided into three zones or grading
areas. Area A is the edge to be concealed at assembly and is specified by the procuring activity (see 6.2). B is the
area within 2 inches (50 mm) of the concealed edges, and C is the remaining central area. Maximum allowable
defects shall conform to table I.
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