Alloys used where metal parts must form a hermetic seal with glass or ceramic.

Leading applications include – Optical parts and equipment, lamps, vacuum tubes, etc.
 

Invar

Invar is a low expansion alloy, consisting of Nickel, and Iron. The Invar offers extremely low expansion characteristics teamed with very hig dimensional stability. 

Few applications utilizing Ivnar –

Thermostats, Parts for Aerospace industry, Instruments and optical devices, Seals, spacers,

Invar forms – Bar, Sheet

Invar specifications:
 

• ASTM F-1684

• AMS-I-23011

 

Kovar

Kovar is a low expansion alloy, consisting of Nickel, Cobalt and Iron.

It has good machining and dep drawing values. 

Applications using Kovar includes -

Microwave and power tubes, Electronic components (transistors, diodes, etc) , Instrumentation, etc

Kovar forms  available – Bar, Sheet

Kovar specifications:
 

• ASTM F-1466

• ASTM F-15

• AMS-I-23011