[MIL-G-45204C]
Gold is by far the most popular elemental
metal; and gold plating follows suite. Functional, practical, effective.
Superior
corrosion resistance, spectacular aesthetics. Yellow to orange color
depending on proprietary process used. Ranges from matte to bright finish
depending on basis material and type, grade and class of gold used. Brightness
of under plating will also affect appearance. Excellent corrosion resistance,
and has high tarnish resistance. Provides low contact resistance, and is
an excellent conductor. Gold has excellent solderability. If the hardness
grade for the gold coating is not specified, Type I shall be furnished
at hardness Grade A, and Type II shall be furnished at hardness Grade C.
For soldering, a thin, high purity soft gold coating is preferred. A minimum
thickness of .000050 inch and a maximum thickness of .00010 inch shall
be plated.
Type I: 99.7% gold minimum (Grades
A, B, or C).
Type II: 99.0% gold minimum
(Grades B, C, or D)
Type III: 99.9% gold minimum
(Grade A only).
Grade A: 90 Knoop maximum.
Grade B: 91-129 Knoop.
Grade C: 130-200 Knoop.
Grade D: 201 Knoop and over.
Class 00: .00002" minimum thickness
Class 0: .00003" minimum thickness
Class 1: .00005" minimum thickness
Class 2: .00010" minimum thickness
Class 3: .00020" minimum thickness
Class 4: .00030" minimum thickness
Class 5: .00050" minimum thickness
Class 6: .00150" minimum thickness
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