MIL-PRF-46197A
4.2.1
First article inspection . First article inspection shall be performed
on the first production-representative sample(s) of an order when a first
article sample is required (see 3.1). The first article sample(s) shall be
examined for all the provisions specified by the procuring activity, the
contract or the purchase order (see 6.2).
This inspection shall consist of the tests specified in 4.3 through 4.8. The
supplier has the option to perform either the Package (Ball) density or the
Shore "O" Package hardness test. Only one of these two tests is required.
4.2.2
Conformance inspection . Conformance inspection for acceptance of high
strength woven glass roving impregnated with polyester resin shall meet all
the provisions specified by the procuring activity, the contract or the
purchase order (see 6.2).
4.3
Roving .
4.3.1 Yield . Compute the roving yield by dividing the weight of the specimen
into the measured length of the specimen resulting in units such as
yards/pound.
4.3.2
Density . Test the Package (Ball) density using the standard test
methods for Density and Specific Gravity (Relative Density) of Plastics by
Displacement, ASTM D792.
4.3.3 Hardness . Use a shore "O" durometer or equivalent to test the outermost
layer of the roving ball. Make three readings randomly spaced around the
circumference and along the length of the ball.
4.3.4
Catenary . Measure the distance between
the
furthermost
separated
strands perpendicular to the lengthwise direction.
4.3.5
Tensile strength . Test five specimens per roving ball using the
standard test method for Tensile Properties of Glass Fiber Strands, Yarns, and
Rovings Used in Reinforced Plastics, ASTM D2343.
0
4.3.6
Resistance to fusion . Ignite at a temperature of 1494 ± 45
F (812 ±
0
25 C) a specimen of accurately measured length weighing 10 grams.
4.3.7
Woven glass roving . Examine the material for compliance with the
requirements specified in 3.3.7.
4.4
Prepreg physical properties .
4.4.1
Characteristics . Examine the impregnated woven glass roving for the
characteristics specified in 3.4.1.
4.4.2 Volatile 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
weighed, dried by suspending for 10 minutes ± 1 minute in a circulating air
oven at the materials postcure temperature 250 ± 10 0F (121 ± 6 0C), cooled in a
desiccator, and re-weighed.
Volatile Content % =
(Initial wt - Dry wt )
X 100
Initial wt
5
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