Composite KPIs

Composite Manufacturing KPIs and Benchmarks: Target Numbers That Matter

The KPIs that matter in composite and fiberglass production, with world-class versus typical benchmark ranges and the specific levers to move each metric.

First-pass yield (FPY) is the headline composite KPI because rework is slow and often impossible. Measure it as parts accepted without repair divided by parts produced in the same family and period. Typical shops run 80 to 90 percent FPY on stable parts; world-class prepreg lines hold 95 percent or better, while new-program launches often start near 60 to 70 percent. Track it on the Composite Yield calculator against a control-plan target of 95 percent. The fastest levers are ply orientation poka-yoke, operator certification, and tool condition, since misoriented plies and worn molds drive most first-pass failures.

Material utilization, or nesting yield, is the second big lever because fiber is the largest cost line. Utilization is usable ply area divided by consumed roll area. Hand nesting on complex parts wastes 25 to 40 percent; automated ply nesting pushes utilization to 80 to 88 percent, and world-class flat-pattern work exceeds 90 percent. Every point of yield recovered on a shop buying 68 dollar per lb prepreg is real cash. The levers are automated nesting software, common-blank sharing across part numbers, and tightening kit cut plans so trim strips get reused rather than scrapped.

Autoclave and cure asset utilization decides how much of your fixed cost earns money. Utilization is charged cure hours divided by available hours; loading efficiency is parts per load divided by rated capacity. Many shops run autoclaves at 45 to 60 percent utilization with half-empty loads; world-class scheduling reaches 75 to 85 percent by batching parts with matching cure cycles. Use Cure Cycle Capacity to test whether the schedule fits before committing dates. The levers are cure-cycle families, load planning that fills the envelope, and moving low-temperature parts to ovens so the autoclave runs only what needs pressure.

Scrap rate deserves its own KPI split into prepreg scrap and cured trim scrap. Prepreg scrap as a percent of purchased material commonly sits at 15 to 30 percent on complex layups; disciplined shops hold it under 12 percent, and world-class stays near 8 percent. Freezer-expiry scrap should be near zero with proper out-time tracking. Cured trim scrap is harder to recover since the labor and cure are already spent. Levers include out-time and shelf-life monitoring, net-shape ply cutting, and moving from oversize blanks to precise CNC-driven kits.

Labor productivity is measured in ply-square-feet placed per labor hour, and it exposes staffing and training gaps. Hand layup of woven fabric runs 40 to 70 ply-sq ft per hour; automated fiber placement reaches thousands of times that on large surfaces but only justifies itself at volume. Benchmark your crews against a time-studied rate for the same fabric and complexity, not a shop average. The improvement levers are standardized work, kitting so laminators never leave the tool to hunt material, and debulk scheduling that removes idle waiting from the placement clock.

Laminate quality holds to tight physical targets that double as process KPIs. Fiber volume fraction should land at 55 to 60 percent for autoclave prepreg and 35 to 45 percent for wet layup; void content must stay under 2 percent for structural aerospace parts and under 1 percent for the most critical. Cured ply thickness should track the ply book within a few thousandths of an inch. Drift outside these bands signals compaction, vacuum, or cure problems. The levers are vacuum integrity checks, correct debulk frequency, and validated cure profiles with thermocouple coverage across the load.

On-time and cycle metrics tie the technical KPIs to delivery. Track cure asset lead time, layup-to-cure queue time, and schedule adherence. A shop holding 95 percent FPY, 85 percent material utilization, 80 percent autoclave utilization, and under 12 percent scrap will usually also hit 95 percent on-time, because the same discipline that controls quality controls flow. When you improve KPIs, do it in that order: stabilize FPY first so you stop rebuilding scrapped parts, then chase utilization and scrap, since chasing throughput on an unstable process just produces defects faster and buries the gains you thought you booked.

Published 2026-07-01.