Case 1272 ยท Public preview
Small Terminal Deflections Can Open a Leak Path Through a Glass Feedthrough
Two filter terminal sections failed hermeticity testing and showed cracks around multiple solderable glass feedthroughs.
Optical microscopyMetallographic microsectioningBackscattered-electron SEMInterface crack-path examinationTerminal-alignment assessment
What the evidence preview establishes
Mechanical loading bent the soldered outer terminals and fractured the glass and terminal interface. The most severe seal contained a continuous outside-to-inside gas path that explained the leak.
Why this case matters
Glass feedthroughs are vulnerable to terminal bending. When hermeticity is lost, section along the pin axis and determine whether meniscus or interface cracks form a continuous leak path.
Full evidence reserved for MEMBER and STOREThe complete case includes the evidence sequence, four interpreted figures, alternative explanations, limitations, and practical application guidance.