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PEEK and LCP Injection Molding: Warpage and Process-Control Checklist
PEEK and LCP parts should be reviewed as material-process-tool systems. Grade, reinforcement, moisture condition, flow orientation, wall transitions, gate and vent design, mold temperature, handling, and measurement method can all change warpage and functional dimensions.
Freeze the exact resin definition
Record manufacturer, commercial grade, reinforcement, color, approved regrind rule, drying or storage requirement, certificate expectation, and substitution authority. “PEEK” or “LCP” alone does not define comparable processing or part behavior.
Design around flow and anisotropy
| Design area | Question | Validation need |
|---|---|---|
| Wall and ribs | Are transitions gradual and are ribs sized for the actual grade? | Fill, sink, stress, and warpage review |
| Gate | Does location support fill, weld-line placement, packing, and gate removal? | Simulation or trial evidence appropriate to risk |
| Venting | Can trapped gas escape at end-of-fill and around thin features? | Tool inspection and controlled trial |
| Critical geometry | How does fiber orientation affect shrinkage and strength? | Datum-aware dimensional study and application test |
Treat tooling and process windows as linked
Steel choice, vent maintenance, heating, thermal balance, gate wear, and cavity finish affect repeatability. Record the validated process window and reaction plan rather than relying on one successful sample setting.
Measure after a defined conditioning state
Specify when and how parts are measured, which datums are used, whether fixtures distort thin features, and what conditioning or stabilization applies. A dimensional comparison is weak if supplier and buyer use different timing or support.
Release checklist
- current drawing, model, revision, and governing specifications;
- material, condition, quantities, secondary processes, and environmental requirements;
- marked critical features and agreed measurement methods;
- sample, documentation, packaging, and change-control expectations;
- recorded assumptions, exclusions, and approval responsibilities.
Review custom injection molding, quality control, or send the resin and drawing package.
Authorship and limits
Revised by Zhengna Technology on 2026-07-19 from a buyer-risk and made-to-drawing manufacturing perspective. This page does not establish universal tolerances, certifications, capacity, MOQ, lead time, or application approval.
Questions buyers ask
Can PEEK and LCP use the same molding settings?
No. The exact grade, reinforcement, part geometry, mold, machine, and supplier data determine the process. A generic shared setting is not a controlled method.
What causes warpage in high-performance plastic parts?
Common contributors include uneven walls, fiber orientation, gate location, pressure and temperature gradients, cooling imbalance, residual stress, ejection, and measurement condition.
What should a buyer approve before SOP?
Approve the resin definition, drawing and datums, tool status, process window, sample and capability evidence, cosmetic standard, packaging, traceability, and change-control route appropriate to the project.