MIL-E-82756(OS)
g.
Wash down the gutter and walls of the flask with distilled water.
h.
Titrate the sample with 0.1N sodium thiosulfate solution until it changes to dark yellow.
i.
Add 5 mL of starch indicator solution which has been prepared by adding 1 gram of starch
to 100 mL of distilled boiling water.
j.
Continue titration of the sample until the blue color changes to colorless.
k.
Run a blank as described above for the sample.
l.
Calculate the percent EC as follows:
(6.71)(ϑ Κ)(Ν)
Περχεντ ετηψ χεντραλτε
λ
ι
Α
where:
J = mL of 0.1N sodium thiosulfate used in blank
K = mL of 0.1N sodium thiosulfate used in sample
N = Normality of 0.1N sodium thiosulfate solution
A = Weight of sample in grams.
4.6.2.6 METN and TEGDN. The percent MTN and TEGDN is found by subtracting the percentages
of all the other components (resorcinol, EC, nitrocellulose, AP, and aluminum) from 100%. The esters,
MTN and TEGDN, are determined as a sum, and it is necessary to make an assumption as to the ratio of
the MTN and TEGDN. The assumption is that the ratio is 23:2.5.
4.6.3 Uncured PBXN-103 composition analysis. The chemical composition of the uncured
PBXN-103 shall meet the requirements of table I when tested by the methods of 4.6.3.1 through 4.6.3.7.
4.6.3.1 Sample preparation. Weigh a 2-gram sample from 4.5.3 to the accuracy of ± 0.1 mg into a
tared medium porosity 30-mL crucible equipped with a stirring rod.
4.6.3.2 Mixed plasticizer. Extract the mixed plasticizer at room temperature on a vacuum filtrator
with five 20-mL portions of reagent grade methylene chloride. Save this filtrate for resorcinol and EC
determinations. The extraction should have a stirring time of 1 minute with the vacuum off. Do not draw
residue dry until after the last extraction. Dry the sample for 30 minutes in a 100 ± 5·C oven, and then
cool it to room temperature. Weigh the crucible plus the residue.
(Α Β Χ)
Ξ 100
Περχεντ µ ιξεδ šλ σ ιχιζερ
ατ
Α
where:
A = Weight of sample in grams
B = Weight of crucible plus rod in grams
C = weight of crucible and rod plus residue in grams
13
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