ASTM B-488

Standard Specification for Electrodeposited Gold for Engineering Uses ASTM B-488
ASTM Type Purity
Type I 99.7% Gold minimum
Type I I 99.0% Gold minimum
Type I I I 99.9% Gold minimum
ASTM Code Hardness
A Knoop hardness 90 max.
B Knoop hardness 91-129
C Knoop hardness 130-200
D Knoop hardness 201+
Class Minimum thickness, um
0.25 0.25
0.50 0.50
0.75 0.75
1.00 1.00
1.25 1.25
2.50 2.50
5.00 5.00