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MIL-G-45204C Gold Plating

ENS Technology is a leading provider of military grade gold plating services. We provide pure gold coatings that meet a number of electrolytic gold plating specifications:

  • MIL-G-45204
  • ASTM B488
  • AMS 2422
  • MIL-DTL-45204
  • and other commercial and international standards

Contact ENS today for complete gold plating service.

Electrolytic Gold Plating

Through our highly controlled plating processes, we provide electrolytic gold plating in a uniform, customer-specified thickness across the surface of each part.  Even the most complex parts can be plated with reliable  consistency.

Thanks to our advanced plating capabilities, we can deposit gold plating to a wide variety of substrates, including:

  • Mild steels
  • Stainless steels
  • Hardened & tool steels
  • Copper & copper alloys
  • Tellurium Copper  /  TeCu
  • Beryllium Copper  /  BeCu
  • Brass
  • Nickel-silver  /  German silver
  • Aluminum & aluminum alloys
  • Inconel
  • Nickel 200
  • Kovar
  • Monel
  • and other exotic metals

Properties of Mil-Spec Gold Plating

MIL-DTL-45024 electrolytic gold plating is yellow to orange in color, with a matte to bright finish; both factors depend on details of the plating process.  It offers excellent thermal and electrical conductivity, and provides low contact resistance. Mil-spec gold plating does not oxidize or chemically react under normal conditions, and also provides for excellent solderability. 

These properties make military grade gold plating popular for electronics applications. Soft and hard gold platings are commonly applied to contacts, medical equipment, and other critical electronic components.

Types, Grades & Classes of MIL-DTL-45204 Gold Plating

There are three (3) different types, four (4) different classes, and eight (8) different grades of MIL-DTL-45204 mil-spec gold plating. The type refers to purity of the gold plating; the class refers to the hardness of the coating; and the grade of an electrolytic gold plating refers to its thickness. It should be noted that the type, grade, and class requirements are completely different for ASTM B488 gold platings and AMS 2422 gold platings.

Types of Mil-Spec Gold Plating

  • Type I: 99.7% minimum gold content (Grades A, B, or C)
  • Type II: 99.0% minimum gold content (Grades B, C, or D)
  • Type III: 99.9% minimum gold content (Grade A only)

Grades of Mil-Spec Gold Plating

  • Grade A: 90 Knoop maximum
  • Grade B: 91-129 Knoop
  • Grade C: 130-200 Knoop
  • Grade D: 201 Knoop and above

Classes of Mil-Spec Gold Plating

  • 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 6: 0.00150” minimum

Chemical Requirements for Electrolytic Gold Plating

To ensure the quality and consistency of our military grade gold plating, the ENS team monitors our chemical solutions very closely throughout the coating process. Temperature, pH, gold concentration, and other factors must be tested regularly.  The solution must be replenished frequently to maintain the proper chemical concentrations.

Regular testing helps us ensure that the optimum chemical concentration is maintained. We also mechanically agitate our gold plating solution to improve coating smoothness and to prevent streaking and other defects.

Contact Us for Military Grade Gold Plating

With extensive skills and experience, ENS Technology can provide electrolytic gold platings to meet MIL-G-45204, ASTM B488, AMS-2422, MIL-DTL-45204, or  and other commercial and international standards.

Request a quote on gold plating service for your project, or contact us for more information.