Common resins
ABS, PC, PP, POM, PA, TPU, TPE and clear PC or PMMA applications are reviewed according to part requirements.
Custom Injection Molding
Custom plastic injection molding for production parts.
Cemal provides custom plastic injection molding services in China, connecting part review, tooling and trials with production, inspection, assembly and packing. Share your resin, batch quantities and acceptance requirements for a project-specific quotation.
Why Cemal
Reduce the handoff risk between mold maker and molding factory.
The same manufacturing organization can review the part, build and adjust the tool, establish the molding process and prepare finished parts for shipment. See our custom injection mold manufacturing workflow for new tooling.
Injection molding performance depends on more than machine tonnage. Part geometry, resin behavior, gate location, shrinkage, cooling, ejection, surface finish and the tool itself all affect repeatability. Cemal reviews these connected decisions before production and uses trial feedback to refine the manufacturing plan.
For a new project, buyers can provide STEP, STL, PDF, DWG, ZIP files or reference images together with the target resin, quantity, appearance requirements and delivery timing. The engineering team uses that information to identify open questions and prepare a quote. The molding equipment and inspection overview provides context for capability discussions; machine tonnage alone does not establish whether a particular part is suitable.
Capabilities
Material, production and secondary-operation support.
Molding routes
Standard injection molding, insert molding, trial samples, low-volume programs and repeat production.
Finishing & assembly
Texture, appearance review, secondary operations, assembly and packaging can be coordinated with production.
Quality support
Dimensional checks, first article review, surface inspection, material confirmation and packaging checks.
Project workflow
From RFQ to repeatable molded parts.
| 1. Drawing review | Check geometry, draft, wall transitions, ribs, bosses, undercuts, gate options, resin and critical tolerances. |
|---|---|
| 2. Tooling plan | Align the mold concept with volume, part quality, maintenance and the intended production life. |
| 3. Trial & correction | Review samples, dimensions, appearance and process behavior; make agreed adjustments before approval. |
| 4. Production | Run the confirmed process with inspection, finishing, assembly and packing requirements controlled. |
| 5. Repeat orders | Maintain the manufacturing record and support follow-on production when demand changes. |
FAQ
Questions buyers ask before requesting a quote.
What information produces the clearest injection molding quote?
Send a 3D model or drawing, resin or application, expected quantity, surface and color requirements, critical tolerances, assembly needs and the target timeline.
Can Cemal support a project before the mold is built?
Yes. The workflow can begin with DFM review and prototype or CNC work before tooling decisions are finalized.
Can you support lower quantities?
Yes. Cemal evaluates prototype, bridge and low-volume requirements as well as repeat production. The appropriate tool and process depend on the part and quantity.
Is there a standard minimum order or unit price?
No single figure applies to every custom part. Resin, part geometry, tooling, setup, batch quantity, finishing and inspection affect the quotation. Provide the first batch and expected repeat demand so the proposed scope and pricing assumptions can be reviewed together.
Can I request a specific tolerance or material certification?
Include the requirement and the affected features or material grade with your RFQ. Feasibility, measurement methods and documentation availability must be confirmed for the project before acceptance; they are not implied by the general equipment list.
Production RFQ checklist
Specify the finished part, not just the order quantity.
| Resin and color | Provide the required grade, color reference and any material documentation needs. If the grade is open, describe the operating conditions and constraints for review. |
|---|---|
| Batch demand | Separate the initial order, repeat batch sizes and annual forecast. Identify variants, inserts or assemblies that must be quoted separately. |
| Quality criteria | Supply the controlled drawing, critical dimensions, cosmetic zones, functional checks and the requested inspection or reporting scope. |
| Delivery scope | Specify finishing, assembly, individual protection, packing, destination and target dates. Confirm which services and shipping costs the quotation includes. |
For pilot batches or uncertain demand, use our low-volume injection molding page to compare the production options.
Sample approval and repeat orders
Make acceptance requirements usable on the shop floor.
Before production approval, agree which drawing revision, resin and color the trial represents. Review critical dimensions, appearance and assembly fit against the requirements you supplied. Document any accepted deviation and unresolved issue rather than relying on an informal sample approval.
For repeat orders, identify the approved part revision and any changes in material, finish, quantity or packaging. Confirm the inspection scope and delivery plan for that order. A revised resin or geometry may require another review or trial before the previous approval can be reused.
Start with an injection molding DFM review if the design is not ready for tooling. Browse representative molded parts and applications to discuss surfaces and features relevant to your project; examples are not a guarantee that every requirement is achievable.
Related buying guide
For the tooling portion of your project, see how to compare injection mold costs and scope.
Need an injection molding RFQ?
Send drawings, resin, quantity and timing for an engineering review.