16/01/2026
Machined plastic parts can be a brilliant option - quick to iterate, highly accurate and ideal when you need low friction, corrosion resistance, electrical insulation, or weight reduction.
The catch? Plastics don’t behave like “lightweight aluminium”, so designs, tolerances, and fits need a slightly different approach.
We’ve just published a practical guide on our blog covering:
• How to choose the right polymer (acetal, nylon, UHMW-PE, PTFE, PEI/Ultem, PPS, PEEK, PVDF/PCTFE)
• What tolerances are realistic and what actually affects cost and lead time
• DFM tips to reduce distortion and improve repeatability
• Inspection considerations (measuring force, temperature, compliance)
• Quality expectations, including ISO 9001 and AS9100 standards where required
Read the full guide here (link below) 👇
https://tarvinprecision.co.uk/machined-plastic-parts-practical-guide-materials-design-quality-performance/
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Machined plastic parts guide to materials, tolerances, ISO9001/AS9100 quality and design tips for precision CNC machining.