MIL-DTL-18001L
4.3.2 Chemical analysis. The chips selected in accordance with 4.3.2.1 shall be analyzed to determine
conformance with 3.1.1. A strong magnet shall be used to remove any iron contamination picked up during the
preparation of the chips. The chips shall be washed in an iron-free degreasing solvent prior to analysis. If any
sample does not conform to the chemical composition specified in table II, it shall be cause for rejection of the lot
represented by the sample.
4.3.2.1 Sampling for chemical analysis. Anodes shall be taken from each homogenous lot to verify compliance
with the chemical requirements of 3.1.1 and table II. As a minimum, the first, middle, and last poured anode shall
be tested to verify compliance with the chemical requirements of 3.1.1 and table II. The drilling for sampling for
chemical analysis shall be made with a special nonferrous drill bit. See 4.3.2.7, 6.5.1, and 6.5.2 for sample
preparation and drilling procedure. From each of the required anodes, one 2-ounce sample shall be taken by drilling
or machining the material at the locations specified in 4.3.2.2 to 4.3.2.7, inclusive. The drill or tool bit shall not
penetrate into the core material of the cored type anodes. The drilled or machined anodes may be included in the
delivery of the material, except Type ZDM which shall be discarded.
4.3.2.2 Drilling locations. Type ZHS and ZHB anodes shall be drilled or machined at locations about
2 to 5 inches (50.8 to 127 millimeters) from the short edge as appropriate to keep away from the encased core.
4.3.2.3 Drilling precautions. Type ZSS, ZBS, ZHC, and ZTS anodes shall be drilled or machined at points not
greater than ½ inch (12.7 millimeters) from the long edge.
4.3.2.4 Drilling points for types ZEP, ZMP, and ZBP. Type ZEP, ZMP, and ZBP anodes shall be drilled at
points midway between the outer edge of the core and the edge of the anode.
4.3.2.5 Type ZDM samples. Type ZDM anodes shall have a sufficient number of discs machined or drilled to
make two 4-ounce quantities. Type ZDM anodes shall be machined or drilled at the outer surface to a depth not
exceeding ¼ inch (6.35 millimeters).
4.3.2.6 Surface chips. One 2-ounce sample for each anode specified in 4.3.2.1 shall be taken at the surface in
contact with mold wall by drilling or machining to a maximum depth of ¼ inch (6.35 millimeters). The sample for
Types ZPN and ZRN shall be taken by drilling completely through both larger surfaces or through the diameter of
the anode, as applicable. The samples shall be collected in individual clean containers, and properly labeled as to
lot, melt, and sample numbers. Sample chips may be taken from anodes which have passed the applicable bond test.
Samples shall be clean and free from dirt, oil, grit, and foreign matter. The samples shall be sent to a laboratory
acceptable to the contracting agency. A method for sampling anodes for chemical analysis is specified in 6.5.
4.3.2.7 Determination of aluminum, cadmium, copper, iron, and lead. The aluminum, cadmium, copper, iron,
and lead content of zinc shall be determined in accordance with the appropriate methods in ASTM E536 using the
atomic absorption, inductively coupled plasma, or directly coupled plasma spectrophotometers.
4.3.2.8 Spectrochemical analysis. Spectrochemical analysis shall be in accordance with any standard method
approved by a standard issue body, such as the American National Standards Institute or ASTM E536, and accepted
by the Government.
4.3.3 Physical tests.
4.3.3.1 Sampling for physical testing. At least five Type ZRN and five Type ZPN anodes shall be selected at
random from a lot. Type ZRN anodes shall conform to the tests specified in 4.3.3.3 and 4.3.3.4. Type ZPN anodes
shall conform to the test specified in 4.3.3.3.
4.3.3.2 Physical test sample dimensions for ZPN type anodes. Type ZPN test samples shall be cut from the
plate anodes and shall be of the following dimensions:
a.
Width: Twice the thickness of the anode.
b.
Length: 12 inches (304.8 millimeters) (or to suit test apparatus).
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