MIL-DTL-10866E
d. Observe the samples closely through the magnifier and record the initial melting point.
e. The initial melting point is defined as the temperature at which positive evidence of
liquefaction is observed. Just before this temperature is reached, samples show varying degrees of
shrinkage away from the walls of the capillary tube. Then, the main column of sample collapses
against the side or the bottom of the capillary, or both. After a further rise in temperature, which
may vary from 0.2 °C to more than 1 °C, the portion of the sample in contact with the tube is
observed to form a distinct liquid film that wets the surface. The liquefaction or wetting may
occur at the bottom, sides, front, or rear of the capillary tube. When wetting occurs at the back, the
point may be missed unless care is taken to watch the rear of the tube. The capillary tube may be
rotated to view the rear side. The area of the wetted surface should represent 25 to 50 percent of
the area of the tube in contact with the sample and visible to the operator. The temperature at this
point is taken as the initial melting point. The minute droplets resulting from the small particles
that adhere to the wall of the capillary tube after the shrinkage of the sample should not be
considered in arriving at the initial melting point. Neither should a darkening or color change of
the sample be considered, but such changes should be noted along with any additional evidence of
decomposition.
4.2.4.6.5 Calculation. Calculate the corrected initial melting point in degrees Celsius as
follows:
Ai = Bi + Di - Ci
where: Ai
=
Corrected initial melting point of unknown sample
Bi
=
Observed initial melting point of unknown sample
Di
=
Assigned initial melting point of standard sample
Ci
=
Observed initial melting point of standard sample
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as
specified in the contract or order (see 6.2). When packaging of materiel is to be performed by
DoD or in-house contractor personnel, these personnel need to contact the responsible packaging
activity to ascertain packaging requirements. Packaging requirements are maintained by the
inventory control point's packaging activities within the military service or defense agency, or
within the military service's system command. Packaging data retrieval is available from the
managing military department's or defense agency's automated packaging files, CD-ROM
products, or by contacting the responsible packaging activity.
5.2 Unit quantity. The urea shall be packed in 22.7 kilograms (kg), 45.4-kg, or 907.2-kg
unit quantities as specified (see 6.2).
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