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|  MIL-C-10578D
weighed to determine the amount of contents. Any container in
the sample having one or more defects or under required fill
shall be rejected, and if the number of defective containers in
any sample exceed the acceptance number of the appropriate
sampling plan of MIL-STD-105, the lot represented by the sample
shall be rejected.
4.3
Test methods.
4.3.1 Phosphoric acid content. Pipet 5 mL aliquots of the
sample into each of two separate 500 mL Erlenmeyer flasks
allowing 30 minutes for complete drainage of the pipets. Add 200
mL of distilled water to each flask. To the first flask add 2 mL
phenolphthalein indicator (prepared as 0.1 percent solution in 90
percent ethyl alcohol by dissolving 0.1 g of phenolphthalein
powder in 100 mL of 90 percent ethyl alcohol). To the second
flask add 2 mL of bromphenal blue indicator (prepared as 0.1
percent neutralized aqueous solution). Titrate each sample with
standardized 2.0 N sodium hydroxide. Note burette reading at the
end points for each. Calculate H3PO4 as follows:
H3PO4 (grams of orthophosphoric acid per 100 mL of compound) =
1.96 N(A-B)
Where:
N = normality of sodium hydroxide
A = mL NaOH to phenolphthalein end point
B = mL NaOH to bromphenol blue end point
1/2A = B 0.5 mL
(1/2A must equal B 0.5 mL. Otherwise, the compound contains
mineral acids contrary to the requirements of this
specification.)
4.3.2 Flash point. The flash point shall be determined using
the Tag Closed Tester in accordance ASTM D56.
4.3.3 Appearance. Thoroughly shake the sample. Place 100 mL
of the compound in a graduate. Allow to stand for 24 hours and
note whether any cloudiness, sediment, or sludge formation is
apparent.
4.3.4 Homogeneity. Place 25 mL of the compound in a 100 mL
graduate. For types I, II, IV, and V, dilute with water to 100
mL and shake. For type III, dilute to 50 mL and shake. Note if
any separation occurs.
4.3.5 Comparison formulae. Prepare standard comparison
compounds according to the formulae in table II. Perform tests
in duplicate and simultaneously on these standard compounds and
on the sample compounds.
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