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