Kovar®

Alloy Materials for Uniform Thermal Expansion

KOVAR® (ASTM F15) is an alloy of nominally 53% iron, 29% nickel, and 17% cobalt produced with very tight composition controls that assure precise and uniform thermal expansion and mechanical properties.

This low and very uniform thermal expansion enables the material to be used in glass-to-metal seals in electronic components which have final usage in all major industries. With characteristics similar to hard glass, Kovar® is widely used in the electronics industry for these electronic packaging applications requiring hermetic seals.

What you need to know about buying KOVAR materials:

  1. Produced to ASTM F15, KOVAR® material can be provided in wire, rod, bar, strip, and sheet format.
  2. It is important to provide the temper designation that is required as defined in ASTM F15 from annealed to full hard (can be Tempers “A” through “E”).
  3. Deep drawing tempers are available when requested.
  4. Surface finish can be as hot rolled, as forged, centerless ground, polished, cold rolled, and as drawn (for wire).

Why buy from Leading Edge Metals and Alloys?

  • Industry-wide competitive prices
  • Guaranteed customer satisfaction
  • Industry knowledge and experience
  • Same day shipping for in-stock materials
  • Custom fabrication and finishes

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Product Selection and Purchasing Options

Beyond KOVAR®, Leading Edge offers a wide range of products in multiple shapes and sizes, even in small quantities. Many are available for immediate shipment from our warehouse. If we don’t have the specialty material you need, there’s a good chance we can find it. With our flexible purchasing options, you can ensure materials are available when they’re needed. Purchasing options include blanket orders, just-in-time delivery, and consignment materials.

Special Commitment to Compliance and Quality

Leading Edge Metals & Alloys adheres to quality compliance certification standards and statutory regulations that pertain not only to the exotic materials we provide but also to our processes, custom machining services, and other aspects of our in-house expertise. We know the exotic and refractory metals industry, and our materials specialists provide expert counsel on metal selection and inspection to ensure you receive materials that meet or exceed your expectations.

Our team of experts has more than 100 years of combined experience in exotic and refractory metals, and we are committed to responsible, quality sourcing and use processes as well as ethical practices that benefit our customers, people, and planet.


Leading Edge Metals & Alloys Certifications include:

ISO certified, ITAR Registered, AS9100D and cybersecurity maturity model logos