MIL-PRF-46197A
3.4.4
Resin flow . Resin flow shall be 8 ± 4%.
3.4.5 Gel time . Gel time shall be not less than 50 seconds nor greater than
150 seconds.
Prepreg reactive properties . A heating rate of 3 0C (37.4 0F) per minute
3.5
shall be used. The temperature range of the scan shall be room temperature to
2000C (392 0F). The heat of reaction (cal/gm), onset temperature ( 0C), and peak
temperature ( 0C) shall be reported, along with the complete Differential
Scanning Calorimetry (DSC) curve.
3.6
Laminate properties .
3.6.1 Test panel . A cured laminate test panel shall be fabricated to conform
with the physical and mechanical property requirements in table I.
3.6.2 Flammability . The flame on the laminate shall self-extinguish within 15
seconds following a 10 minute application in order to pass the test specified
in 4.6.8.
3.7
Laminate ballistic property test method
.
3.7.1
Laminate preparation . The laminate shall have a thickness or aerial
density as specified in the contract. The fabric content shall be 68 ± 3% by
weight.
3.7.2
Ballistic testing . The V50 ballistic limit shall meet or exceed 2380
ft/s (725 m/s).
3.8
Storage and out-time requirements . Material shall
comply
with
the
requirements of this specification after the following:
o
F (4 0C) or
a.
6 months storage in the shipping container at 39.2
less.
0
F (27 0C) max) sealed in
b. 240 hours at room temperature (80.6
a polyethylene bag.
After 6 months storage, the material may be recertified to this specification
for an additional 3 months shelf life. After 9 months storage the material may
be recertified again, for an additional 3 months. The material shall be
disposed of after 1 year.
4. VERIFICATION
4.1
Verification alternatives . Alternative test methods, techniques, or
equipment, including the application of statistical process control, tool
control, or cost effective sampling procedures may be proposed by the
contractor. Acceptable alternative verification approaches shall be identified
in the contract.
4.2
Classification of inspections . The inspection requirements specified
herein are classified as follows:
a.
First article inspection (see 4.2.1)
b.
Conformance inspection (see 4.2.2)
4
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