Case 2272 ยท Public preview
Seal Damage Can Drive Anode-Lead Corrosion and Open-Circuit Failure
Two capacitors were electrically open, while two not-yet-failed comparison capacitors had already lost capacitance and showed early degradation.
Electrical testingOptical microscopyDissectionSEMEDSFTIR
What the evidence preview establishes
Internal corrosion opened the anode leads just inside the rubber seals. Poor seal condition and lead-construction features plausibly allowed moisture and contamination to enter; the not-yet-failed capacitors showed the same corrosion mechanism at an earlier stage.
Why this case matters
A capacitor can progress toward an open circuit without venting or bulging. Inspect the anode lead inside the seal, compare failed and not-yet-failed units, and treat seal distortion and construction variation as reliability evidence rather than cosmetic differences.
Full evidence reserved for MEMBER and STOREThe complete case includes the evidence sequence, four interpreted figures, alternative explanations, limitations, and practical application guidance.