MIL-DTL-24191D(SH)
3.
REQUIREMENTS
3.1 First article. When specified (see 6.2), a sample shall be
subjected to first article inspection in accordance with 4.3.
3.1.1 Quality conformance inspection. Quality conformance inspection
during production shall consist of the inspection specified in 4.5.
3.2 Materials. The material shall be methacrylate base plastic,
manufactured and processed so as to conform to all the requirements of this
specification (see 6.2).
3.2.1 Surface finish for all types except for RTPS-2, BTPS-2 and
CLEAR-2. Flat sheets shall have a smooth surface finish on both sides.
3.2.2 Surface finish for RTPS-2, BTPS-2 and CLEAR-2. Type RTPS-2,
BTPS-2 and CLEAR-2 flat sheets shall have a smooth surface finish on one side
and a patterned pyramidal surface on the other side which shall consist of a
uniform array of 64 square pyramidal prisms per square inch, each with an
included angle of 118 + 2 degrees at the apex and approximately 0.021 inch
high.
3.3
Dimensions.
3.3.1 Length and width. Length and width of sheets shall be as
specified in the contract or order (see 6.2).
3.3.2 Thickness. Thickness of flat sheets that are used to fabricate
window assemblies of specific shape as specified in the equipment
specifications of lighting fixtures shall be as specified in the contract or
order to suit contractor's fabrication procedures (see 6.1 and 6.2). Unless
otherwise specified in the equipment specifications for lighting fixtures,
thickness tolerance of flat sheets which are only cut to specified dimensions
without further forming to specific shapes shall be as shown in table I.
Thickness of type RTPS-2, BTPS-2 and CLEAR-2 shall be measured from the flat
smooth surface to the vertex of the prisms.
Nominal thickness, thickness tolerance and formability diameter.
TABLE I.
Thickness tolerances (inch)
Formability
Nominal
All types and grades
RTPS-2, BTPS-2
diameter
thickness
except RTPS-2,
and CLEAR-2 3/
(inches)
(inch) 1/
BTPS-2 and CLEAR-2
only
(heated)
2/ 0.060
+0.015
-
1.5
-0.019
0.080
+0.014
-
2.0
-0.020
0.100
+0.013
-
2.5
-0.021
0.125
+0.015
+0.045
3.1
-0.025
-0.015
0.150
+0.019
-
3.8
-0.031
0.187
+0.017
+0.043
4.7
-0.033
-0.027
0.220
+0.020
-
5.5
-0.040
0.250
+0.020
+0.045
6.3
-0.040
-0.020
See footnotes at top of next page.
3
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