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|  MIL-C-48868E (AR)
Percent (%) Acrylic =
Where:
V = Volume of standard acid for sample, ml.
B = Volume of standard acid for blank, ml.
N = Normality of standard acid
W = Dried sample weight, g.
4.5.1.3.4.1 Alternate method.
Preparation of samples. Each sample shall be cut into
approximately 1/4 inch squares. Cut and dry, in microwave or
oven, approximately 2.5 g from each sample and cool in
desiccator. From each sample, approximately 1.0 g shall be
selected for testing and weighed to the nearest 0.2 mg. Test
is destructive and samples should be removed from the lot.
Analytical procedure.
Solvent extraction.
Place the sample in a square beaker and add about 50 mls of
absolute methanol. Completely homogenize the sample in methanol
for approximately 2 minutes with a polytron homogenizer. Turn
the homogenizer to low speed, then with a squirt bottle of
technical grade acetone, slowly add the acetone down the shaft
of the homogenizer until the level reaches about 1/2 inch from
the top of the square beaker. Stir at slow speed for 2
minutes. Set up a vacuum flask with appropriate filter paper
and carefully transfer the homogenized sample into the vacuum
flask funnel. Immediately wash the shaft of the homogenizer
with about 50 mls of acetone and transfer to the vacuum flask
funnel. Wash the shaft of the homogenizer again and continue
until all of the fibers of the sample have been completely
transferred to the vacuum flask funnel. Turn on the vacuum.
After the liquid has been completely drained into the flask,
wash the sides of the funnel and sample with acetone, assuring
that all of the fibers are on the filter paper. Leave the
vacuum on until the sample is completely dry, about 1 minute.
Remove the vacuum funnel and carefully remove the filter paper
folding it over the sample to insure that no sample is lost.
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