Product Variants of Sealing and Solder Glass Frits
Sealing glasses help create powerful bonds in high-temperature scenarios and corrosive systems, such as fuel cells and batteries. Solder glasses achieve excellent sealing at lower temperatures without thermal damage to partner materials.
Sealing Glasses

YOUR ADVANTAGES
- Complete technical support from sample quantities to mass production using decades of experience in glass-to-metal sealing.
- Lead-free solutions for virtually all possible applications.
- Sodium-resistant glass handles highly corrosive processes.
APPLICATIONS
- Glass-to-metal seals
- Solid oxide fuel cells (SOFC) and electrolyzer cells (SOEC)
- Hydrogen generation and fuel cells
- Flash lights
- High-temperature sensor applications
- Molten sodium batteries (Na/S, Na/NiCl)
Solder Glasses

YOUR ADVANTAGES
- Full range of glass types for different material combinations and temperature profiles.
- Lead-free solutions for all major applications.
- Custom formulation of glass type and grain size upon request.
APPLICATIONS
- Opto-electronic packaging (solder caps, lens caps)
- MEMS packaging
- Sealing of display devices
TYPES OF SOLDER GLASSES
- Vitreous glasses: able to preserve their material properties during the soldering process, remaining in a ‘glassy’ state.
- Devitrifying glasses: partially crystallize while sealing, which raises their softening temperature.
- Composite glasses: maintain a very low coefficient of thermal expansion, while enabling low soldering temperatures.
Granulates and Preforms

CHARACTERISTICS
The preforms are pressed and sintered glass pearls, discs or rods which, for example, are used as spacers. Preforms come in customized geometric shapes and sizes, with diameters ranging from less than one millimeter to several centimeters. SCHOTT also ensures tightly controlled tolerances for preform weight and shape.
YOUR ADVANTAGES
- Preforms are ideal for hermetic glass-to-metal seals.
- Available in standard or customized geometric shapes and sizes.
- Closely controlled tolerances for preform weight and shape.

Antonio Trizzino
Sales Manager Europe