MIL-PRF-23950B(AS)
4.4 Conformance inspection. The following procedures shall be performed to determine
compliance with section 3. Other test methods may be used if they offer assurance of equal
results.
4.4.1 Sampling. Sampling shall be determined by the acquiring activity (see 6.2). One
container shall be considered as one unit of product. Each sample shall be representative of the
container.
4.4.2 Chemical composition. The chemical composition of the aluminum powder furnished
in each lot shall be in accordance with table I. Failure to comply with these requirements shall be
cause for rejection of the lot. The composition of each lot of material will be determined by the
methods explained in the following paragraphs.
4.4.2.1 Determination of purity.
4.4.2.1.1 Apparatus.
a. Beckman Model K automatic titrator or any hydrogen-ion concentration (pH) meter
capable of pH measurement with reproducibility of 0.02 and accuracy of 0.1 pH.
b. Magnetic stirrer, if pH meter is used.
c. Buret, 50 milliliters (mL), for use with pH meter.
4.4.2.1.2 Solutions.
a. Potassium fluoride, 50 percent. Dissolve 250 grams (g) of potassium fluoride dehydrate
into 250 mL of distilled water. Add two grams of potassium hydroxide to ensure alkalinity.
Adjust the pH of this solution to 10.5 with hydrochloric acid (HCl) and potassium hydroxide, and
store in a polyethylene bottle. This solution shall be adjusted to pH of 10.5 before use in
aluminum analysis.
b. Aluminum standard solution. React one gram of aluminum of known purity (National
Institute of Science & Technology (NIST) standard or equivalent (see 6.3), with 20 mL of 25
percent sodium hydroxide (NaOH) in a 250-mL beaker covered with a watch glass. After the
reaction has ceased, boil the solution to ensure complete reaction. Cool and transfer the solution
to a one liter volumetric flask. Wash the beaker with six portions of water and add the washings
to the volumetric flask. Make up to mark with distilled water.
c. 0.1 normal (N) hydrochloric acid. This solution may be standardized against the
aluminum standard solution. The procedure for this standardization is the same one used in
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