Extrusion (Metal & Plastic) Scrap Rate — Benchmarks and Reduction Guide
Track and reduce Extrusion (Metal & Plastic) defects in real time. No spreadsheets required.
Aluminum extrusion butt-end scrap typically represents 5-8% of billet weight as unavoidable planned waste. Start-up scrap adds another 1-3%. Total planned extrusion scrap of 6-11% is industry-standard; unplanned defect scrap should be held below 2% with good process control.
At a Glance
4.2%
Industry average scrap rate
1.8%
Top-quartile benchmark
8.5%
Bottom quartile
What Causes Scrap in Extrusion (Metal & Plastic) Operations
Extrusion forces material through a die to create a continuous profile. Scrap includes start-up and transition waste (inherent) and out-of-spec profile from dimensional, surface, or contamination failures.
The manufactured part's dimensions fall outside specified tolerances — length, width, height, diameter, flatness, or angularity. Dimensional deviation is the most common defect reason across all manuf…
Imperfections on the visible or functional surface of a part — scratches, dents, pits, porosity at the surface, roughness out of specification, discoloration, or coating failures. Surface defects may …
Scrap Rate Benchmarks — Extrusion (Metal & Plastic)
| Performance Tier | Scrap Rate |
|---|---|
| Top quartile | 1.8% |
| Industry average | 4.2% |
| Bottom quartile | 8.5% |
Source: Pareto Base data compilation from industry benchmarking reports, 2026.
How a Extrusion (Metal & Plastic) Team Uses Pareto Base
An extrusion quality manager notices start-up waste accounts for 35% of total scrap but has never been formally tracked. A Pareto Base campaign targets start-up waste reduction with a corrective action standardising purge and process stabilisation procedures. Weekly tracking confirms whether the new procedure reduces the start-up waste window.
Common Defect Reason Codes for Extrusion (Metal & Plastic)
When operators log scrap in Pareto Base, these are the most common reason codes for Extrusion (Metal & Plastic) operations:
- ✓Start-up / transition waste
- ✓Dimensional rejection (profile out of spec)
- ✓Surface defect (die lines, drag marks)
- ✓Color contamination
- ✓Material degradation
- ✓Splice waste
- ✓End-of-billet scrap (metal extrusion)
Dispositions typically logged:
- Scrap
- Regrind / remelt
- Downgrade
- Short length (alternate use)
Still tracking Extrusion (Metal & Plastic) scrap in spreadsheets?
Extrusion (Metal & Plastic) defect data collected on paper or in spreadsheets is almost always too stale to drive real-time corrective action. By the time the weekly quality report is compiled, the production run causing the problem is already done. Pareto Base captures the data at the point of occurrence — giving your team the ability to respond during the run, not after it.
Track Extrusion (Metal & Plastic) Quality with Pareto Base
Pareto Base is purpose-built for manufacturing teams. Log Extrusion (Metal & Plastic) defects by reason and disposition, see your Pareto chart update in real time, and launch a targeted reduction campaign — all without a spreadsheet.
Free plan available. Basic plan from $18/month.