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Electro-deposited Gold (Au) Plating

Optiforms Electro-deposited Gold (Au) platings are proven to out-perform industry standard platings.

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Optiforms Electro-deposited Gold (Au) Platings

Totally inert, gold is an excellent reflective surface for the near to far infrared spectrum. Gold is available as an electrodeposited plating or vacuum deposited coating based on the application and/or substrate material. Reflective scans are available upon request and are typically based off of flat witness samples coated in the same lot as the actual substrate.

Electrodeposited Gold (Au):

Pure Gold

  • Deposit purity: 99.99% minimum
  • Hardness: 130 Knoop
  • Meets ASTM B488-01 Type 3 Grade C (supersedes MIL-G-45204).

Cobalt-Hardened Gold

  • Deposit purity: 99.7% minimum
  • Hardness: 130-200 Knoop
  • Meets ASTM B488-01 Type I Grade C (supersedes MIL-G-45204).

ASTM-B-488 (MIL-G-45205)

Gold Purity

Mass Percent Gold, Minimum, Excluding Potassium, Carbon, & NitrogenNew ASTM TypeMIL-DTL-45204Old ASTM Type
99.70II2
99.00IIII3
99.90IIIIII1

Gold Hardness

Knoop Hardness RangeASTM CodeMIL-DTL-45204 Grade
90 HK25 maximumAA
91 - 129 HK25BB
90 - 200 HK25......
130 - 200 HK25CC
>200 HK25DD

Gold Thickness

ClassMinimum Thickness, µm
0.250.25
0.500.50
0.750.75
1.01.0
1.251.25
2.52.5
5.05.0

Vacuum Deposited Gold

Bare Gold

Protected Gold (Au)

Enhanced Gold with Dichroic Stack

Applications

  • Laser cavities
  • Medical instrumentation