Sealing Glass for Kovar
CTE-Matched Sealing Glass
for Kovar Hermetic Sealing
Sealing Glass for Kovar
Sealing Glass for Kovar |
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| Product Code | Color | Glass Composition | Density | Operating Temperature | CTE (30–300°C) |
Product Form |
| SK016 | Green, Blue, White, Brown，Black | Si2O-B2O3-R20 | 2.28 g/cm3 | 970-980 /℃ | 5.0±0.5 ×10-6/K |
Glass Granulates/
Glass Preforms
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| SK043 | Green, Blue, White, Brown，Black | Si2O-B2O3-R20 | 2.30 ±0.06 g/cm3 | 930-960 /℃ | 5.59±0.5 ×10-6/K | |
Typical Applications
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Crystal Oscillator Header
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Hermetic Rectangular Connector
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Hermetic Circular Connector
CTE Matched to Kovar
Reliable Hermetic Sealing
Lead-Free & RoHS Compliant
Flexible Customization
Available Supply Forms
Sealing glass for Kovar is specially formulated for matched hermetic glass-to-metal seals using Kovar alloy (4J29). Its coefficient of thermal expansion is carefully engineered to closely match that of Kovar, helping reduce residual stress in the glass during sealing and maintain reliable seal integrity through heating and cooling.
Kovar is a low-expansion iron-nickel-cobalt alloy suited for sealing assemblies that require controlled thermal expansion. Its coefficient of thermal expansion can be closely matched to that of suitable sealing glasses, making it well suited for matched hermetic glass-to-metal sealing.
Closely matched coefficients of thermal expansion allow the glass and Kovar to expand and contract at similar rates as temperature change. This helps reduce stress at the sealing interface and lowers the risk of cracking or seal failure.
Selection should consider factors such as coefficient of thermal expansion requirements, sealing temperature, component structure, dimensions and processing conditions. Sinopride provides engineering support for product selection.
Seal reliability depends on the wettability between the glass and metal,coefficient of thermal expansion, sealing temperature, component geometry,and controlled heating and cooling rates. Selecting the appropriate glass grade and sealing process is essential for maintain stable and reliable hermetic performance.
Product
