Machined Plastics: a buyer's sourcing guide
Everything a procurement team should know before opening an RFQ for machined plastics: materials, tolerances, certifications and red flags.
Recent RFQs in the metalworking sector
Overview
Plastic CNC is the right answer when volumes don't justify injection moulding tooling but the part needs engineering polymer performance: chemical resistance, low friction, biocompatibility.
When to choose this process
Prototypes, ≤1000 pcs/year, semi-finished bar/sheet stock, applications with stress relief constraints.
Typical materials
- PEEK
- POM-C
- PA6 G
- PTFE
- PC
- PVDF
Typical tolerances
±0.05 mm but mind thermal expansion (3–5× metals) and post-machining stress relief.
Certifications to ask for
- ISO 9001
- ISO 13485 (medical)
- FDA, USP Class VI for medical polymers
Frequently asked questions
Why is PEEK so expensive?
Raw bar can cost €400–€1200/kg; cutting parameters are slow to avoid melting; certified medical grades add a premium.
Do I need post-machining annealing?
On thick PEEK or POM, yes — it removes residual stress and prevents cracking in service.
Sourcing countries covered
Editorial market guide. Supplyria is a marketplace; we don't list private suppliers on this page. Cost ranges and lead times are indicative and based on public industry benchmarks.