MIL-PRF-46197A
4.6.4
Flexural . The standard test methods for Flexural Properties of
Unreinforced and Reinforced Plastics and Electrical Insulating Materials, ASTM
D790. The axis of the specimen shall be in the 0 0 direction.
4.6.5
Compressive strength . The standard test method for Compressive
Properties of Rigid Plastics, ASTM D695, shall be used. The axis of the
specimen shall be in the 0 0 direction.
4.6.6
Short beam shear strength . The standard test method for Apparent
Interlaminar Shear Strength of Parallel Fiber Composites by Short-Beam Method,
0
ASTM D2344 shall be used. The axis of the specimen shall be in the 0
direction.
4.6.7
Glass transition temperature . The glass transition temperature "Tg"
shall be determined according to ASTM D4065 using the following parameters:
3 0C/minute
Heating rate
RT-225 0C (437 0F)
Temperature range
Oscillatory amplitude
0.2 mm
Grip length
2.54 cm (1 inch)
Atmosphere
Dry, nitrogen purge
The temperature of the damping peak maximum shall be assigned as the "Tg"
value.
4.6.8 Flammability . A weighed specimen layed up and cured according to the
manufacturers' specifications shall be supported in a vertical position on a
standard laboratory jack with a 0.25 inch (6.35 mm) layer of rigid thermal
insulating material between the jack and specimen. A 14 oz (414 ml) propane
gas cylinder fitted with a "Turbo Torch" head, model STK-9 (Wingearsheek Co.,
Danvers, MA) or equivalent shall be adjusted to produce a 4-5 inch (10.2-12.7
cm) long flame jet. With the entire set up placed in a fume hood, the torch
shall be positioned such that the tip of the flame jet impinges on the sample
surface. The samples shall then be subjected to the flame for 10 minutes,
unless catastrophic failure, excessive smoke, or any other event dictates
termination of the test. During the 10 minute interval, significant events
shall be recorded with respect to elapsed time: flame breakthrough, sustained
combustion, time to flame, etc. At the 10 minute mark, the flame source shall
be removed and the time for any sustained flame to extinguish shall be noted
and the specimen shall be allowed to cool. The specimen shall then be weighed,
the weight loss determined, and the specimen shall be sealed in a watertight
bag for future reference.
4.7
Laminate ballistic property test method
.
4.7.1 Laminate preparation . Four cured ballistic test laminates measuring
1 x 1 ft (30.5 x 30.5 cm) shall be layed up and cured according to the
manufacturers' specifications.
4.7.2
Ballistic testing . The V50 ballistic limit shall be determined as
defined in MIL-STD-662 using a 20 mm fragment simulating projectile.
4.8
Storage and out-time requirements . Examine the material for compliance
with the storage and out-time requirements specified in 3.8.
5. PACKAGING
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