Material: pins and frame ASTM F-15 Kovar alloy per Mil-I-23011. Class 1.

Glass: Corning 7052 or equivalent.

Finish: frame and pins: electroless nickel per Mil-C-260748. 100 microinches minimum. 350 microinches maximum.
Pins: gold plate per Mil-G-45204. Type III.
Grade A. 50 microinches minimum.
Frame and Pins: gold plate per Mil-G-45204.
Type III. Grade A. 50 microinches minimum.

Finish: frame and pins: electroytic nickel per QQ-N-290. 100 microinches minimum. 350 microinches maximum.
Pins: gold plate per Mil-G-45204. Type III.
Grade A. 50 microinches minimum.
Frame and Pins: gold plate per Mil-G-45204.
Type III. Grade A. 50 microinches minimum.