MIL-PRF-46108C
TABLE I. Maximum allowable defects.
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Allowable defects 1/
Types of defects
Area C
Area B
Gaseous inclusions
1/16 in. (1.6 mm)
3/32 in. (2.4 mm)
Open gaseous inclusions
3/64 in. (1.2 mm)
1/16 in. (1.6 mm)
Stones and knots
1/32 in. (0.8 mm)
3/64 in. (1.2 mm)
Ream and string
Shall not be evident at an angle greater than 30° between line of
sight and glass surface, with indirect daylight.
Scratches and rubs
Use ASTM F548 for plastics and ASTM F428 for glass.
Digs
1/16 in. (1.6 mm)
3/32 in. (2.4 mm)
Crush
Shall not be detectable at distances greater than 10 ft (3.0 m), with
indirect daylight.
Lint and hair
Shall not be detectable at distances greater than 3 ft (0.9 m)
looking perpendicular to the glass, with indirect daylight.
Insects or other organic matter
Shall not be detectable at distances greater than 3 ft (0.9 m)
looking perpendicular to the glass, with indirect daylight.
Inside dirt
3/32 in. (2.4 mm)
3/32 in. (2.4 mm)
Surface defects
Shall not be detectable at distances greater than 10 ft (3.0 m).
Interlayer striae
Shall not be detectable at distance greater than 10 ft (3.0 m)
looking perpendicular to the glass, with indirect daylight.
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1/ All discrete defects shall be separated by at least 12 in. (30 cm). The defects listed are the maximum
permissible. Defects not specifically mentioned shall be compared to the defect they most closely resemble.
Defect(s) include any related distortion to the area surrounding the defect.
3.8 Serviceability. Unless otherwise specified (see 6.2), minor imperfections that do not affect serviceability shall
be permitted.
3.9 Marking of test samples. Transparent armor samples submitted for ballistic testing shall be clearly marked
"IMPACT SIDE" on the side to be impacted by the test projectile. Caution shall be exercised in handling to
prevent scratching of the plastic surface.
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