Thank you for visiting the Advanced Plating Technologies Specification Database. Below is a technical summary of specification MIL-G-45204C from Military Specification (Mil Spec) for Gold. For more information on our full line of Gold services please visit our gold plating services page. You can also request a quote or contact a member of our technical sales team for more information.
Company: Military Specification (Mil Spec)
Application: Gold, Type I (99.7% gold minimum), Type II (99.0% gold minimum), Type III (99.9% gold minimum), Grade A (Knoop hardness 90 max), Grade B (Knoop hardness 91-129, incl.), Grade C (Knoop hardness 130-200, inlc.), Grade D (Knoop hardness 201 and over), Class 00 (0.00002″ minimum), Class 0 (0.00003″ Minimum), Class 1 (0.00005″ Minimum), Class 2 (0.00010″ Minimum), Class 3 (0.00020″ Minimum), Class 4 (0.00030″ Minimum), Class 5 (0.00050″ Minimum), Class (0.00150″ Minimum)
Plate Thickness: Minimum thickness is defined by class.
Strike Thickness: per section 6.3 – a copper, nickel, or copper plus nickel underplate may be used, depending on the application and the environment. Silver or copper plus silver may not be used unless required by item specification. A soft gold strike from a separate plating tank should follow any other undercoating and precede the final gold coating to improve adhesion and prevent contamination of the main gold plating solution by metallic impurities. When applied to a copper rich surface such as brass, bronze or beryllium copper or a copper plate or strike, an antidiffussion underplate such as nickel shall be applied.
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