Gold

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Gold Mil Spec Thickness Comments
MIL-G-45204C
Yellow to orange color depending on proprietary process used. Will range from matte to bright finish depending on basis metal. Good corrosion resistance and has high tarnish resistance. Provides a low contact resistance and is a good conductor. Has excellent solderability.



Type I
Type II
Type III
Class 00
Class 0
Class 1
Class 2
Class 3
Class 4
Class 5
Class 6

 Unless otherwise specified


.00002” min.
.00003” min.
.00005” min.
.00010” min.
.00020” min.
.00030” min.
.00050” min.
.00150” min.



99.7% gold min.
95.5% gold min.
99.9% gold min.
Grade A 90 knoop max
Grade B 91-129 knoop
Grade C 130-200 knoop
Grade D 201 knoop and over

Type I (Grades A, B or C)
Type II (Grades B, C, or D)
Type III (Grade A only)


ASTM Designation: B 488

Electrodeposited Coatings of Gold

Purity
Mass Percent Gold, Minimum ASTM Type MIL-G-45204
99.90 1 III
99.70 2 I
99.00 3 II

Hardness
Knoop Hardness Range ASTM Type MIL-G-45204
90 HK25 maximum A A
91-129 HK25 ... B
90-200 HD25 B ...
130-200 HK25 C C
>200 HK25 D D

Relationship between Purity and Hardness
ASTM
Code
I
A, B and C
II
B, C and D
III
A only

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