MIL-DTL-45444C
4.6.2 Inspection equipment. Commercially available
inspection equipment shall be used for all examinations and tests
specified in 4.5 and 4.7. The contractor is responsible to have
the necessary equipment available, use it correctly and to assure
that proper calibration procedures are followed. The designation
of an instrument of a particular make or model number is not
intended to preclude the use of an equivalent make or model which
is capable of performing the required test. Government approval
of all inspection equipment is required prior to its use for
acceptance purposes. Inspection equipment designs shall be
submitted to the Technical Agency (see 6.9).
4.7 Methods of inspection. The following tests shall be
performed using prescribed analytical procedures for replicate
determination given in standard and analytical textbooks. Also,
unless otherwise specified herein, all chemicals and reagents
shall be ACS Grade or reagent grade chemicals (see 6.10 for use
of equivalent test methods).
4.7.1 Purity of HMX. The alpha HMX, beta HMX and RDX
content of HMX shall be determined by x-ray diffraction as
follows:
A Philip Electronic Instrument x-ray diffractometer (or
equivalent) equipped with voltage and current stabilizer,
scintillation detector and copper target tube (1) shall be used
for the determination of alpha HMX, beta HMX and the RDX content
of HMX. The energy source tube of the instrument should be
capable of an excitation of 40kV and a filament current of 20 ma.
A pulse height analyzer capable of passing copper Ka (alpha)
radiation should be used. A nickel filter may be used to remove
copper Kb (beta) radiation. Tube voltage and filament current
can be selected by analyzing five of the calibration standards at
two different settings. The x-ray diffraction patterns for alpha
HMX, RDX, and beta HMX indicate characteristic diffractions at
17.81 degrees and 25.10 degrees two theta respectively for RDX
and alpha HMX in the presence of beta HMX. (These angles may
vary slightly according to the alignment of the instrument).
Background intensities for RDX and alpha HMX can be measured at
16.90 degrees and 24.10 degrees two theta, respectively. Beta
HMX, the major component, is determined by difference.
Note 1: The x-ray equipment shall be operated in accordance with
the manufacturer's instructions.
4.7.1.1
Beta HMX, alpha HMX and RDX, for use as calibration
standards.
4.7.1.1.1 HMX (beta) and RDX calibration standards. High
purity HMX (beta) and high purity RDX suitable to be used as
calibration standards are obtainable from Holston AAP/HDC; ARDEC,
Picatinny Arsenal and the Naval Surface Warfare Center.
(See 6.8). The HMX and RDX used for high purity standards shall
have a minimum purity of 99.90%.
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