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ASTM Designation: B 488

Electrodeposited Coatings of Gold
Purity:

Mass Percent Gold, MinimumASTM TypeMIL-G-45204

99.90 1 III
99.70 2 I
99.00 3 II

Hardness:

Knoop Hardness RangeASTM TypeMIL-G45204

90 HK25 maximum A A
91-129 HK25 B 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

Coating Thickness

Class
Minimum Thickness
0.25 microns
0.25 microns
0.50 microns
0.50 microns
0.75 microns
0.75 microns
1.0 microns
1.0 microns
1.25 microns
1.25 microns
2.5 microns
2.5 microns
5.0 microns
5.0 microns

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