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MIL-L- 24131C(SH)
(b)
The batch number(s) of the high solids mill dispersion.
(c)
The batch number(s) of the solvent (isopropanol) used in the high solids mill dispersion and in
the final product.
(d)
The actual results of each production inspection and test.
(e)
The certification of cleanliness required by 4.3.4.3(b), when applicable.
(f)
A statement of compliance to the qualification approval requirements and the date and a copy
of the record of approval of qualification tests and inspection data by NAVSEA or its
authorized representative.
4.2 Qualification tests. Qualification tests shall be conducted at a laboratory satisfactory to
NAVSEA. Qualification tests shall consist of the tests specified in 4.4, in addition to the quality
conformance inspections and tests specified in 4.3. Application for qualification tests shall be made in
accordance with "Provisions Governing Qualification SD-6" (see 6.4 and 6.5).
4.3 Quality conformance.
4.3.1 Inspections, tests, sampling and reports shall be in accordance with the requirements of this
specification.
4.3.1.1 Lot. A lot of lubricant offered for delivery shall consist of all material manufactured in one
operation using high solids graphite mill dispersion and solvent (isopropanol), each of one batch
designation.
4.3.1.2 Batch. A batch of ingredient or semi-finished materials shall consist of a quantity of
material produced at one time for use in the final product and identified by a designation characteristic of
the one batch.
4.3.2 Samples. Samples taken shall be from the final product in the marked approved containers
(see 5.2 and 5.3). Samples shall be held in the container for at least 24 hours and shaken thoroughly
before specimens are taken for test. When the election to perform the analysis for ash, chlorine, fluorine
and sulfur on the high solids graphite mill dispersion is made, the supplier shall also take at least two
representative samples from each storage tank or storage container.
4.3.3 Quality conformance inspection.
4.3.3.1 Film properties. Film properties shall be determined on both regular and irregular surfaces.
4.3.3.1.1 Regular surface. A single thickness of lubricant approximately 2 square inches in area
shall be brushed on a metal surface and permitted to dry for at least 5 minutes to determine compliance
with table I. The metal shall be at least 1/4 inch thick and the surface shall be dry, clean, free of mill
scale, and have a surface finish of 32 to 63 microinches. Film properties shall be determined as follows:
5

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