Sealing Glasses | NEC SCHOTT

To manufacture hermetic and highly insulating electrical seals between different materials such as metal or ceramics, the use of sealing glasses is wide spread in the electronics industry. Sealing glasses typically have a processing temperature of 800–1000°C.

Product Description

Sealing glasses mostly belong to the borosilicate and aluminosilicate glass families.

To manufacture reliable hermetic seals, the correct choice of coefficient of thermal expansion (CTE) is a key factor. The applied glass composition depends on the materials which should be joined, the required temperature profile as well as their CTE. For matched seals, the CTE of the glass is matched as closely as possible to those of the sealing partners. In case of compression seals, a well-defined mismatch of the CTE is used intentionally to compress the sealing materials onto each other.

SCHOTT offers sealing glasses for both sealing concepts and a variety of materials ranging from silicon to stainless steel.

SCHOTT provides sealing glasses in the form of fine ground powder, paste, granulate and preforms.

NEW! SCHOTT now provides Glass and Glass-Ceramic Sealants for Technical Ceramics in High-Temperature Applications. Please refer to the download below for more information.

Glass and Glass-Ceramic Sealants for Technical Ceramics in High-Temperature Applications

Product Advantages

Great scope of different glass types and grain distributions
Lead-free solutions for virtually all possible applications
Custom formulations upon request
Full support from sample quantities to mass production with decades of experience in glass-to-metal sealing technology

Applications

Glass-to-metal seals
Solid oxide fuel cells (SOFC)
Flash lights
High temperature sensor applications

Technology

Glass powders are manufactured in two steps:

Features / Specifications

Please refer to the following table to chose the right sealing glass for a variety of material combinations:

All sorts of sealing glasses are available in a number of different grain sizes.

Forms of Supply and Product Packaging

Our standard packaging consists of sealed PE-Bags in cardboard drums. For alternative packaging solutions please contact us.

Quality Assurance

Generally, all of our products are RoHS-compliant. For details on individual glasses, please contact us.

For more information on the different quality assurance programs, please refer to our quality assurance processes.