MIL-DTL-11751G
4.2 Inspection conditions. All inspections shall be performed on a lot. A lot shall
consist of the potassium hydroxide solution of one class, produced by one manufacturer in no
more than 24 hours, at one plant, from the same materials, and under essentially the same
manufacturing conditions, provided the operation is continuous. In the event the process is a
batch process, each batch shall constitute a lot.
4.3 First article inspection. First article inspection shall be performed on a
representative sample of the first lot produced when a first article sample is required (see 3.1).
This inspection shall include the requirements in tables I, II, III, and IV, and the tests of 4.5.
4.4 Conformance inspection. Conformance inspection shall be performed in accordance
with the inspection provisions set forth herein. The characteristics shown in tables I, II, III, and
IV, when tested in accordance with 4.5, shall constitute minimum inspections to be performed by
the supplier prior to government acceptance or rejection by lot. The inspection set forth in this
specification shall become a part of the contractor's overall inspection system or quality program.
The absence of any inspection requirements in the specification shall not relieve the contractor of
the responsibility of assuring that all products or supplies, submitted to the government for
acceptance, comply with all requirements of the contract. Failure of any test, by any sample,
shall be cause for rejection of the lot.
4.5 Test methods and procedures.
4.5.1 Test specimen preparation. Containers of potassium hydroxide solution shall be
mixed thoroughly by rolling or other means before sampling. A representative specimen of
approximately 125 grams (g) shall be removed from each class 1 and class 2 sample container
and placed in a suitable, clean, dry container labeled to identify the lot or batch and the container
from which it was taken. A representative specimen of approximately 400 milliliters (mL) shall
be removed from each class 3 and class 4 sample container and placed in a suitable, clean, clear,
dry container labeled to identify the lot or batch and the container from which it was taken.
Exposure of the specimen to the atmosphere shall be kept to a minimum to avoid absorption of
water and carbon dioxide.
4.5.2 Appearance. Visually examine the specimen for color (see 3.4).
4.5.3 Potassium hydroxide and potassium carbonate. Determine the percentage by
weight of potassium hydroxide and potassium carbonate of the specimen in accordance with test
methods of AWWA B511.
4.5.4 Specific gravity. Determine the specific gravity of the specimen at 15/4°C in
accordance with method A of ASTM D891.
4.5.5 Chloride. Rapidly weigh 100 g of the class 1, class 3, or class 4 specimen or 6 g of
the class 2 specimen to within 0.1 g and dilute to 1 liter using carbon dioxide-free water to
produce solution "A". Dilute 20 mL of solution "A" with water and filter if necessary through a
chloride-free filter. To 5 mL of the diluted solution, add 15 mL of water, 1 mL of nitric acid,
and 1 mL of 1.7 percent silver nitrate solution. Any turbidity produced shall be no greater than
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