Modified Semi Additive Process Yield Loss Recovery Contract Mechanics
Modified semi additive process contracts require clear yield baselines, defect attribution formulas, and flash-etch metrology to recover scrap costs cleanly.
Batch Scrap Cap
Defect Threshold
Production quality management systems enforce hard limits on acceptable scrap counts within a single manufacturing run. The batch scrap cap establishes the maximum allowable percentage of rejected printed circuit boards before a panel lot triggers an immediate halt to fabrication lines. Automated optical inspection stations evaluate each panel against IPC Class 2 or Class 3 workmanship criteria.
Scrap Tracing
Fabrication failures during inner-layer etching or lamination generate irreversible material scrap that cannot be reworked. Establishing a batch scrap cap prevents automated plating and etching lines from consuming valuable raw laminate on out-of-spec production panels. When inner-layer micro-voiding or drill misalignment exceeds pre-set statistical action limits, line operators quarantine the affected lot.
Root-cause analysis identifies whether etch chemistry imbalance or drill spindle runout caused the systemic defect. Continuous monitoring of laminate quality minimizes unexpected scrap spikes across multi-layer bonding cycles. Early termination of failing batches preserves chemical baths and drill tooling for compliant orders.
Process Halt
Escalation protocols activate immediately upon exceeding established scrap boundaries during assembly or raw board fabrication. The batch scrap cap forces formal engineering sign-off before line restart occurs. Documented corrective actions verify bath chemistry titration or exposure optics alignment.
Quality records track historical threshold breaches to evaluate supplier fabrication stability.