MIL-DTL-23938B(AS)
4.5.6.1 Procedure.
a. Set up the following sieves in order:
No. 325 Sieve
Pan
b. Place approximately 50.0 gm of the dry sample on the top sieve.
c. Shake for 30 minutes.
d. Transfer the material on the No. 325 sieve to a weighing container and weigh to the
nearest 0.1 gm.
e. Calculations:
gms retained
Percent retained on No. 325 Sieve =
x 100
Sample wt.
4.5.6.2 Alternate procedure.
a. Thoroughly wash and dry a US Standard No. 325 sieve and set aside for future use.
b. Place 10 grams of the sample in a 600 mL beaker. Add enough of Triton 720 or Darvan
No. 1 or Nacconal to form a heavy paste, and mix well to thoroughly incorporate the sample
being tested.
c. Dilute the mixture with water to a volume of approximately 300 mL and pour through the
sieve set aside in step a, after the sieve has been weighed to the third decimal place.
d. Wash the material on the sieve with a steady, gentle stream of water which has previously
been passed through a US Standard No. 325 sieve. Using a small camel hair brush, or equivalent,
brush the material through the sieve, running the water through at the same time. Continue this
operation until no more ferric oxide passes through the sieve. Once or twice during the screening,
the sieve may be removed from under the running water and a drop or two of the stock dispersing
agent solution added, and spread over the sieve with the brush; after which, the washing and
brushing operation can be continued.
e. Dry the sieve in an oven at 212 °F to 220 °F for one hour. Cool and weigh the residue.
4.6 Acceptance criteria. All test results shall indicate compliance with the requirements of
section 3. Failure to meet these requirements shall be cause for rejection of the lot.
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