MIL-PRF-46197A
4.4.3
Resin content . The specimen shall be three (3) 4 inch (10 cm) square
pieces of material. One piece to be cut from each side, within 6 inches (15
cm) of the edge, and a third piece cut from the center. The specimen shall be
placed in a tared dry dish (or equivalent), weighed, and ignited in a muffle
furnace at 1051 ± 50 0F (566 ± 28 0C) for 30 minutes or until the specimen has
the color of the glass reinforcement. The crucible and contents shall be
cooled in a desiccator and re-weighed.
Resin Content % =
(Initial wt - Ignited wt )
X 100
Initial wt
For reference, the fiber areal weight (oz/sq yd) shall also be reported based
on the ignited wt/area of the specimen.
4.4.4
Resin flow . Four (4) 4 inch (10 cm) square pieces of material, taken
from across the width of the material, shall be cut, stacked, and weighed. The
stack shall be covered with 6 inch (15 cm) squares of non-porous
polytetrafluoroethylene (PTFE) release fabric or equivalent, and placed in a
0
F (121 0C)
press at 15 psi (103 kPa) pressure and a platen temperature of 250
for 10 minutes. After removing the specimen from the press, the release fabric
shall be removed and edge flash shall be trimmed. The edge flash shall be
trimmed such that the remaining matrix is flush with the edge of the
fiberglass reinforcement. Care shall be exercised during edge flash removal to
ensure that fiberglass reinforcement is not removed during the edge flash
trimming process. After trimming, the specimen shall be re-weighed.
Resin flow % =
(Initial wt - Final wt)
X 100
Initial wt
4.4.5
Gel time . Approximately twenty (20) 2 inch (5 cm) square pieces of
material, taken across the width of the material, shall be cut, stacked,
wrapped in foil, and placed in a press with the platens heated to the
materials' postcure temperature. A hole shall be pierced in the edge of the
foil, and then pressure shall be applied to squeeze resin onto the lower
platen. The extruded resin shall be stirred with a wooden spatula, and the
time for gelation to occur shall be noted. Gelation shall be indicated by a
rubbery, but not stringy, condition.
4.5
Prepreg reactive properties . A sample of resin which has been
mechanically removed (by scraping) from the edge of the prepreg material shall
be analyzed by Differential Scanning Calorimetry (DSC) according to the method
established in the standard test method for Assessing the Thermal Stability of
Chemicals by Methods of Differential Thermal Analysis, ASTM E537.
4.6
Laminate properties .
4.6.1
Resin content . The standard test method for Ignition Loss of Cured
Reinforced Resins, ASTM D2584, shall be used.
4.6.2
Density . The standard test methods for Density and Specific Gravity
(Relative Density) of Plastics by Displacement, ASTM D792, shall be used.
4.6.3 Tensile . The standard test method for Tensile Properties of Plastics,
ASTM D638, Specimen Type I, shall be used. Speed of testing shall be 0.2
0
inch/min (5.1 mm/min). The axis of the specimen shall be in the 0
direction.
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