Case 1292 ยท Public preview
Laminate Voids Can Create Moisture-Sensitive Leakage Paths
A rigid-flex circuit assembly failed electrical isolation testing after humidity exposure but tested normally after drying.
Electrical testingOptical microscopyMicrosectioningSEMEDSLaminate dissection
What the evidence preview establishes
Abnormal gas voids in the PWB laminate most likely enabled the isolation failure. The voided glass-fiber bundles crossed regions between electrical features and could trap moisture or processing chemistry, supporting ionic conduction or conductive-anodic-filament formation under humidity and bias.
Why this case matters
A board that recovers after humidity testing may still contain a structural insulation defect. Section nearby laminate, examine glass bundles for voids, and evaluate moisture and chemistry retention rather than relying only on dry resistance measurements.
Full evidence reserved for MEMBER and STOREThe complete case includes the evidence sequence, four interpreted figures, alternative explanations, limitations, and practical application guidance.