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07.09.2015, Landshut (Germany)

Superior salt spray resistance for hermetic glass-to-metal sealed housings

SCHOTT develops specialized coating that provides improved corrosion protection
SCHOTT has now developed a special coating through which the industry’s salt spray requirements for hybrid housings can be exceeded. The coating protects glass-to-metal seals against corrosion – even after 24 hour salt spray tests. This improves the reliability of hermetic packages, especially for applications in extremely harsh environments, such as aerospace projects. SCHOTT will present its product range from September 8 to 10, 2015, at the European Microwave Week in Paris (booth #228).

To achieve this high level of corrosion protection, SCHOTT uses corrosion-resistant materials. The packages are permanently protected because even if parts of the glass envelope break, only coated areas will be exposed. Thus, SCHOTT’s new coating offers high corrosion resistance even after extremely aggressive 24 hour salt spray tests are performed.

“The corrosion protection offered by our new special coating does not impair the mechanical integrity of the glass-to-metal seal in any way,” explains Robert Hettler, Head of R&D for Opto-Electronics at SCHOTT Electronic Packaging.

Hermetically sealed hybrid packages that include glass-to-metal technology are used to encapsulate multi-chip modules in a wide variety of component manufacturing, such as sensors and components for measurement and in control electronics and microprocessors. These devices are used in radar applications in aviation, laser warner systems, and DC-to-DC converters, for example.

Offering the best materials for the job

Permanently bonding glass and metal together is particularly challenging for most manufacturers because the thermal expansion coefficients of all the materials usually differ, so they must be perfectly matched.

"When advising our customers, SCHOTT engineers draw on our 70 years of experience in hermetically sealed enclosures, and we can recommend and supply the best technology and high-performance combinations of materials,” Hettler said. “SCHOTT’s new coating for hermetic glass-to-metal packages is another industry-leading technology, and devices treated with it will perform at their peak for longer.”

SCHOTT manufactures a wide range of hermetic enclosures for customers based on their special requirements, and its offering includes TO headers and caps, microelectronic enclosures that use glass-to-metal or ceramic-to-metal technology, and fully ceramic packages.

For further information:

SCHOTT is a leading international technology group in the areas of specialty glass and glass-ceramics. The company has more than 130 years of outstanding development, materials and technology expertise and offers a broad portfolio of high-quality products. SCHOTT is an innovative enabler for many industries, including the home appliance, pharmaceutical, electronics, optics, automotive and aviation industries. SCHOTT strives to play an important part of everyone’s life and is committed to innovation and sustainable success. The group maintains a global presence with production sites and sales offices in 35 countries. With its workforce of approximately 15,400 employees, sales of 1.87 billion euros were generated in fiscal year 2013/2014. The parent company, SCHOTT AG, has its headquarters in Mainz (Germany) and is solely owned by the Carl Zeiss Foundation. As a foundation company, SCHOTT assumes special responsibility for its employees, society and the environment.
Press contact
Michael Müller
Public Relations Manager
Hattenbergstraße 10
55122 Mainz
Phone: +49 6131/66-4088
Further information
Salvatore Ruggiero
Vice President Marketing and Communication
Hattenbergstraße 10
55122 Mainz
Phone: +49 6131/66-4140