MIL-DTL-45204D
4.6.3 Hardness. The hardness shall be determined on the cross section of the plating in
accordance with ASTM B578 and ASTM E384 by the use of the Knoop hardness tester using a
test load of 25 grams-force. In accordance with ASTM E384, the Knoop hardness may be
determined perpendicular to the plated surface if the thickness of the plate is at least ten (10)
times the depth of the Knoop indentation.
4.6.4 Heat resistance. The heat resistance of gold plated articles shall be determined by
subjecting samples selected in accordance with 4.4.3 to a temperature of 500° ± 25° F (260° ±
14° C) for not less than 30 minutes and examining for compliance with 3.6.4.
4.6.5 Solderability test. When samples selected in accordance with 4.4.3 or separate specimens
(see 4.4.3.1) are tested, method 208 of MIL-STD-202 shall be used. The specimens shall be
examined and adhesion tested by the bend or cutting test of 4.6.2 for compliance with 3.6.6.
4.6.6 Embrittlement relief. When specified in the contract or purchase order (see 6.2), samples
of parts for determining compliance with 3.7.2 shall be taken as specified in 4.4.3. The article
shall be subjected to a sustained tensile test, using loads applicable to the parts as contained
herein. The articles or parts shall be held under the load for at least 200 hours, unless otherwise
specified (see 6.2.1), and then examined for cracks. The lot shall be rejected if any plated part
develops cracks or fails by fracture.
4.6.6.1 Fasteners. Parts such as steel fasteners, threaded or not threaded, which are used for
mechanical joining of metal shall be subjected to a sustained tensile loading not less than 75
percent of the material specification minimum ultimate tensile strength.
4.6.6.2 Spring pins, lock rings, etc. Parts such as spring pins, lock rings, etc., which are installed
in holes or on rods shall be similarly assembled using the applicable parts specification or
drawing tolerances which impose the maximum sustained tensile stress on the plated parts.
4.6.6.4 Other parts. Other parts, which will be subjected to a sustained static tensile load in
excess of 25 percent of the material specification minimum tensile yield strength in service use,
shall be subjected to a sustained tensile load equal to 75 percent of the materials notched tensile
yield strength. Parts which require fixtures or extreme loads to comply with the above
requirements shall be represented by four separate specimens prepared as specified in 4.4.3.1.2.
4.6.7 Composition. The purity and the level of individual impurities of the gold coating shall be
determined at least monthly by any recognized chemical assay or instrumental method capable of
accurately determining quantities of 0.1 percent or less. Tests for impurities may be waived by
the procuring activity when it has been determined that the process and processing procedures
will be produce coatings conforming to the applicable requirements of 3.6.7 and 3.6.7.1.
4.7 Rejection.
4.7.1 Examination defects. Any sample unit having one or more defects shall be rejected. If the
number of nonconforming sample units in the sample exceeds the acceptance number specified
in 4.4.2, the entire lot shall be rejected.
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