MIL-DTL-82901A(OS)
The hydroxyl value of the polybutadiene = A = 0.84 meq/g
The weight equivalent of the polybutadiene 1000/hydroxyl value = 1190.48 g/eq
The weight equivalent of the isocyanate = B = 113.65 g/eq
NCO to OH ratio = R = 1.0
Using the values given above and the procedures outlined in 6.5, the following is computed:
(113.65) (1.0)
X=
= 0.095 g isocyanate/g polybutadiene
1190.48
The weight percent of the polybutadiene is now (Step 3-1):
100
(0.1124) = 5.365% polybutadiene
2 + 0.095
And likewise the weight percent of the isodecyl pelargonate is (Step 3-2):
100
(0.1124) = 5.365% isodecyl pelargonate
2 + 0.095
And the weight percent isocyanate is (Step 3-3):
(100) (0.095)
(0.1124)= 0.510% isocyanate
2 + 0.095
6.6 HMX batches. HMX batches as received tend to vary considerably from batch to batch. It is
therefore recommended that a 1-gallon (6-kg), or smaller, batch of PBXN-110 be processed and the initial
mix viscosity determined for all new batches of HMX. If the initial viscosity is excessive (greater than 10
kp) thus reducing the mix pot life, then the following techniques may be tried in order to reduce the mix
viscosity and/or increase pot life:
a. Shift the HMX3/HMX2 ratio from 3:1 to a ratio containing more or less Class 2 HMX.
b. To maximize pot life, the mix temperature should be kept at 25°C or less. In addition, the catalyst
level can be reduced to a lower level but one which is compatible with the limits established in 3.4.
c. Reduce the total HMX content to 87 percent.
6.7 Moisture content. To obtain proper physical properties in the cured explosive, the moisture
content of the component raw materials and the moisture content of the uncured explosive should be less
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