Mil-G-45204C

Electrodeposited Gold on Metallic Surfaces
Purity
Type I 99.7% Gold minimum
Type II 99.0% Gold minimum
Type III 99.9% Gold minimum
Hardness
Grade A Knoop hardness 90 Max.
Grade B Knoop hardness 91-129
Grade C Knoop hardness 130-200
Grade D Knoop hardness 201+
Thickness
Class 00 .00002 inch minimum
Class 0 .00003 inch minimum
Class 1 .00005 inch minimum
Class 2 .00010 inch minimum
Class 3 .00010 inch minimum
Class 4 .00030 inch minimum
Class 5 .00050 inch minimum
Class 6 .00150 inch minimum