MIL-DTL-10866E
4.2.3.2 Inspection for test. Each sample specimen taken in 4.2.2.2 shall be tested as
specified in 4.2.4. Failure of any test by any specimen shall be cause for rejection of the lot
represented.
4.2.4 Tests. Tests shall be conducted as follows:
4.2.4.1 Appearance. Visually examine the class 1 urea specimen for color, form, and the
presence of impurities and foreign matter. Visually examine the class 2 urea specimen for form
and flowing characteristics.
4.2.4.2 Nitrogen. Determine percent by weight nitrogen in the specimen in accordance with
ASTM E 258 using the 0.5 normal (N) acid procedure and a specimen weight of 0.50 to 0.60 gram.
4.2.4.3 Water. Determine the percent by weight water in the specimen in accordance
with ASTM E 203.
4.2.4.4 Biuret. Determine the percent by weight biuret in the specimen in accordance with
the procedure in the AOAC International document, "Official Methods of Analysis".
4.2.4.5 Ash. Weigh to the nearest 0.01 gram approximately 50 grams of the specimen
into an ignited tared (to the nearest 0.1 milligram (mg)) platinum dish. Heat until a gray solid ash
remains. Ignite at approximately 800 °C to a constant weight. Cool to room temperature in a
desiccator and weigh to the nearest 0.1 mg. Calculate the percent by weight ash as follows:
Percent ash = 100 (A-B)
W
where: A = Weight of dish and ash in grams
B = Tare weight of dish in grams
W = Weight of specimen in grams
4.2.4.6 Initial melting point. Determine the initial melting point of the specimen as
specified in 4.2.4.6.1 through 4.2.4.6.5.
4.2.4.6.1 Apparatus.
4.2.4.6.1.1 Capillary melting point apparatus. The apparatus shall consist of a silicone
fluid bath, stirrer, immersion heater coil, transformer control, and adjustable magnifier
constructed and be operated in such a way that the temperature around the samples and
thermometer is uniform and can be easily controlled within the limits required by this test
method. A means shall be provided so that the capillary tubes can be introduced into the bath
and properly positioned without removing the thermometer from the heating bath.
4.2.4.6.1.2 Melting point capillary tubes. The capillary tube to contain the sample shall
be a glass tube approximately 90 to 120 millimeters (mm) and 0.9 to 1.1 mm in internal diameter
with walls 0.2 to 0.3 mm thick and closed at one end.
5
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business