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 |