Since World War II, high-performance electrical bulkheads have been sealed by surrounding low-expansion alloy metal pins in a glass or ceramic-filled metal housing. Both glass and ceramic seals offer extremely low leak rates over a wide range of temperatures and pressures. Despite their fragility due to low tensile strength and brittleness, such seals have been successfully used for pressures well over 1000 psi. Passthrough seals designed with epoxy technology increase reliability, eliminate sealed pins, and simplify installation. Characteristics include leak rates comparable to glass, good temperature performance, and low outgassing.
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