MIL-DTL-82901A(OS)
on such production or test, must furnish evidence with the bid that prior Government approval is presently
appropriate for the pending contract. Bidders should not submit alternate bids unless specifically requested
to do so in the solicitation.
6.5 Equivalent ratio. The following method is used to calculate the weight percent of polybutadiene,
isodecyl pelargonate, and isocyanate:
Given:
The hydroxyl value of the polybutadiene
= A, meq/g
The weight of equivalent of the polybutadiene = 1000/A, g/eq
The weight of equivalent of the isocyanate
= B, g/eq
Step 1: Determine the weight in grams of isocyanate required to react with each gram of
polybutadiene. This is accomplished using the following formula:
BR
X=
1000 / A
Where:
X = Weight in grams of isocyanate per gram of polybutadiene
R = Mole ratio of isocyanate to polybutadiene
Step 2: Since the polybutadiene and the isodecyl pelargonate are in a 1:1 ratio, the weight percents of
polybutadiene, isodecyl pelargonate, and isocyanate are in a 1:1:x ratio. The weight percent of isocyanate
is equal to (X/(2 + X)) x 100, and likewise, the weight percent of polybutadiene and isodecyl pelargonate
would be equal to 1/(2 + X) x 100, in the binder
Step 3: Since 11.25 percent of the Type I and 11.24 percent of the Type II explosive composition is
made of these three ingredients , then:
1. Weight percent of polybutadiene in the two types of explosives is as follows:
100
Polybutadiene in Type I explosive =
(0.1125)
(2 + X)
100
Polybutadiene in Type II explosive =
(0.1124)
(2 + X)
2. Weight percent of isodecyl pelargonate in the two types of explosives is as follows:
100
Isodecyl pelargonate in Type I explosive =
(0.1125)
(2 + X)
100
Isodecyl pelargonate in Type II explosive =
(0.1124)
(2 + X)
11
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