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ASTM Designation: B 488

Electrodeposited Coatings of Gold
Purity:

Mass Percent Gold, MinimumASTM TypeMIL-G-45204

99.901III
99.702I
99.003II

Hardness:

Knoop Hardness RangeASTM TypeMIL-G45204

90 HK25 maximumAA
91-129 HK25BB
130-200 HK25CC
>200 HK25DD

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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