MIL-C-768A(OS)
4.4 Tests,
4.4.1 Total copper. Transfer a weighed portion of approximately 2 g of the sample to a
200-milliliter(ml) electrolytic beaker. The weight of the specimen shall be determined on an
analytical balance to the nearest 0.001g. Add 20 ml of 50-percent nitric acid solution and boil until
the copper is dissolved and all oxides of nitrogen have been driven off. Add 10 ml of 50-percent
sulfuric acid, dilute the solution to about 150 ml, and electrolyze. Use sand-blasted platinum
electrodes, the cathode being tared, and a current density of about 3 amperes per 100 square
centimeters of cathode surface. When the deposition of the copper from the solution is complete,
remove the electrolyte and immediately wash the cathode with distilled water. Rinse the cathode
twice with ethyl alcohol, then burn off the excess alcohol while moving the electrode back and
forth through the air. Cool the cathode in a desiccator and weigh. Calculate the increase in
weight as percent total copper.
4.4.2 Granulation. Attach a bottom pan to a U.S. Standard No. 200 sieve conforming to
the requirements of ASTM E-11. Place 100g of the sample on the sieve, cover, and shake for 5
minutes by hand or mechanically by means of a shaker geared to produce 800 ± 15 gyrations and
150 ± 10 taps of the striker per minute. Weigh any material remaining on the sieve and calculate
the percentage passing through the sieve.
4.43 Inspection of packaging. The sampling and inspection of the packing for shipment
and storage shall be in accordance with the quality assurance provisions of the applicable container
specification shown in section 5. The inspection of marking for shipment and storage shaIl be in
accordance with MIL-STD- 129.
4.4.4 Lot acceptance or rejection. When the results of the tests in 4 show that the
requirements of 3 and 5 have been met, the lot represented by the sample shall be accepted.
Otherwise, the lot shall be rejected.
5. PACKAGING
5.1 Preservation. Preservation shall be level A, B, or C, as specified (see 6.2).
5.2 Packing. Unless otherwise specified (see 6.2), the material shall be packed in a
container having a capacity of 4.54 kg and so constructed as to ensure acceptance by common or
other carrier, for safe transportation, at the lowest rate to the point of delivery. Containers used
shall comply with National Motor Freight Classification Rules and the Uniform Freight
Classification Rules or regulations of other carriers applicable to the mode of transportation.
5.3 Marking. Marking shall be in accordance with MIL-STD 129. Marking shall include,
but not be limited to, the following:
a.
Number and revision letter of this specification
b.
Manufacturers name