MIL-DTL-82901A(OS)
Where:
D = Density of test sample, g/cc
Dw = Density of water at test temperature, g/cc
Wa = Weight of test sample in air, g
Wb = Weight of test sample in water, g
4.6.1.4 Failure. If a sample selected for density fails to meet the requirements of table II, another
sample shall be taken from the same section of mix and tested. If the second sample meets the density
requirement, the batch shall be considered to meet the density requirements of this specification.
4.6.2 Stress and strain at maximum stress. Stress and strain at maximum stress shall be determined
in accordance with JANNAF Solid Propellant Mechanical Behavior Manual, CPIA Publication No. 21,
Section 4.3.2, Uniaxial Tensile Tests at Constant Strain Rate (tentative standard), Nov. 1970. Class C
testing shall be used except final specimens may be die cut from the half-inch slices from the bulk sample.
The specimens for testing may be selected from the first third of the batch or the final third when sampled
as described in 4.4.2.
4.6.3 Shore A hardness test (15-second delay).
4.6.3.1 Sample. The explosive of 4.6.1 in a suitable form as in 4.6.1.1 shall be tested for Shore A
hardness. Any sample which exhibits bleeding at the surface at the end of the cure period shall not be
tested.
4.6.3.2 Shore A hardness determination. The hardness of the cured material shall be determined
using a Type A-2 durometer together with a constant load operating stand (Code DRCL). The total weight
of dead weight, holding screw, and durometer shall be 1065 g. Test specimen shall be placed under the
durometer pointer with the pointer resting on the surface of the sample. Release the lock called a "Pawl."
Do not permit the point to shock the sample. Record the instrument dial reading 15 seconds after release.
Use a stopwatch to measure the time. Determine three values each on the top and bottom of the specimen.
Report the average of the top average and the bottom average as the test value.
4.6.4 Vacuum stability test. The vacuum stability test procedure shall be as described in
MIL-STD-650, Method 503.1.1 except sample size shall be at least 0.2 g. Sample shall be cut into small
cubes with a maximum size of 3 millimeters before being placed in the vacuum stability test tube. Two
samples, one from each section of the batch, shall be tested.
4.6.4.1 Alternate vacuum stability test. Vacuum thermal stability test by the pressure transducer
method may be conducted in accordance with STANAG 4556.
4.6.5 HMX analysis.
4.6.5.1 Detailed analytical procedure, cured PBXN-110. Weighed samples of cured material shall
be extracted with carbon tetrachloride (CCl4) and the residue dried and weighed (loss in weight = CCl4
extractables). The residue shall then be extracted with hot dimethylsulfoxide (DMSO), dried and weighed
(loss in weight = HMX). The remaining residue weight is the amount of binder or polymer.
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