Page 9 - ConnectorSupplier.com - How-to-Specify Handbook

stresses within itself to prevent such cracks from propagating and eliminate the hermetic failures associated with cracked glass seals.
4. Weight Savings
Copper alloy pins can be integrated into aluminum connector bodies with a ceramic-to-metal seal to achieve lightweight and highly conductive connector solutions. Direct-seal aluminum connectors are a great option for applications in which light weight, reliable electrical performance, and robust environmental sealing are top priorities, but are best suited for applications without rigorous thermal cycling requirements, as the hermetic performance of this material combination degrades from 1x10-9 He at 1atm to 1x10-5 after repeated thermal cycles.
5. Robust Insulator
Ceramic functions as an excellent electrical insulator at very high temperatures, unlike glass, which conducts more electricity at elevated temperatures. Kryo ex, for example, has a resistivity of 1x1018Ω/cm with easily maintained resistance values in the 50,000MΩ range – even in microminiature designs, and its standoff voltage capability is such that breakdown will always occur in the air media surrounding the terminal, never through the dielectric.
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