MIL-DTL-24191D(SH)
4.5.2 Conformance tests. Conformance tests shall be conducted on the sample
sheets selected in accordance with 4.4.3 and shall consist of the tests specified
in table VI. Results shall be averaged for each sample sheet to determine confor-
mance with this specification. If the average for any sheet fails to conform with
any requirement, this shall be cause for rejection of the lot. Color (chromati-
city) and luminous transmittance do not apply to types RTPS-2, BTPS-2, and CLEAR-2.
TABLE VI.
Conformance tests.
Requirement
Test
Number of
Test
paragraph
paragraph
determinations
Specific gravity
3.6
4.6.2
1
Deflection temperature
3.7
4.6.3
3
under load
Optical properties
3.12
4.6.8
1
4.6
Test procedures.
Test samples.
4.6.1
4.6.1.1 Condition of test samples. Samples shall be tested in the "as
received" condition; that is, no special conditioning shall be required unless
otherwise specified in the test procedure.
4.6.1.2 Test thickness. Tests shall be made on sample sheets of nominal
thickness shown in table I. If sample sheets are tested other than at the nominal
thickness, the test results shall be adjusted to the nominal thickness.
4.6.1.3 Test samples for types RTPS-2, BTPS-2, and CLEAR-2. Test samples
for RTPS-2, BTPS-2, and CLEAR-2 shall be prepared by either of the following
methods:
(a)
The patterned surface shall be ground down to the nearest nominal
thickness shown in table I and polished to a smooth surface.
(b)
The test specimen shall be cast with a smooth surface finish on
both sides to the nearest nominal thickness shown in table I from
the same batch material as that used for the production sheets
under test.
4.6.2 Specific gravity. The specific gravity of the material shall be
determined in accordance with ASTM D 792.
4.6.3 Deflection temperature under load. Conditioned test specimens shall
be tested. The length of the specimen shall be 5 inches, the depth shall be 0.5 +
0.005 inch, and the width shall be the thickness of the original sheet. Thin
sheet materials, less than 0.125 inch (namely 0.060, 0.080 and 0.100 inch) shall
be arranged to form a composite specimen of convenient thickness. The apparatus
shall be similar to ASTM D 648. The conditioned specimen shall be supported as a
simple beam on steel supports 4 inches apart with the load applied vertically on
the top of the specimen midway between the supports. The 1/2-inch dimension or
depth of the beam shall be vertical. The load applied shall be governed by the
width of the specimen and shall in each case induce in the specimen a maximum
outer fiber stress of 264 lb/in2. The loads applied for typical specimens are as
follows:
Specimen
Load applied midway between the supports
1/4 by 1/2 by 5 inches
2.75 pounds
1/8 by 1/2 by 5 inches
1.38 pounds
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