FED-STD-791D
6. PROCEDURE
6.1 Prepare test setup as follows:
a. Fill container to within 1.3 cm of top with specimen, place in heating bath, and
allow sample to reach 46C (5F). (If a liquid bath is used, adjust bath level to
height of sample.)
b. When sample reaches 46C, cover container and remove from bath; allow the
samples to cool to 22 1C.
c. Position the thermometer so that the bulb is just below the surface. Insert the
steel strip into the slit in the cover so that it is in a vertical position in contact
with the wall of the container, with the end resting on the bottom of the
container. Immediately place the sample in the cooling bath.
6.2 Store container in cooling bath without interruption for 18 2 h. Begin
timing the storage period immediately after placing the sample in the cooling bath.
6.3 At end of storage period, remove container from cooling bath, and within 30 s
cut a channel in the sample as follows:
a. Check sample temperature and make sure that it is within 1C (2F) of
specified storage temperature.
b. Without moving steel strip, remove cover and thermometer from container.
c. Note time to nearest second, and within 5 s scrape the vertically-held steel strip
all the way across bottom of container.
6.4 Within 10 s after cutting the channel (see 6.3), check to determine whether
sample has flowed back and completely covered bottom of container. If it has, note it as
non-channeling; if not, note it as channeling.
7. CALCULATIONS
7.1 This section is not applicable to the test procedure.
8. REPORTING
8.1 Report the result as channeling or non-channeling.
9. PRECISION
9.1 Precision data have not been developed for this method.
Method Prepared by:
Army - ME - 1986
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