Over Molding & Insert Molding
SSP provides insert molding services and custom overmolding in Dongguan, China. Materials, tolerances and validation are reviewed for each assembly before tooling and production.
Custom Overmolding & Insert Molding Services
Our insert molding services connect design review, mold manufacture, trial samples and repeat production. Start with your CAD model, resin grade, insert drawing and annual demand. Then identify the interfaces that control fit, sealing or load transfer. For the wider process, see our injection molding services.
Over Molding
Overmolding adds a molded layer to an existing substrate, often for grip or sealing features. Specify the exact substrate and elastomer grades, hardness and exposure conditions. Compatible materials may bond chemically; mechanical retention may also be needed. The Avient part design guidance explains interlocks and shrinkage risks.
Learn More →Insert Molding
Insert molding services encapsulate pre-positioned inserts in molded plastic. Threaded hardware, electrical contacts and locating features need controlled orientation and support during filling. Submit insert tolerances, surface condition and required exposed areas. Agree pull-out, torque or electrical acceptance tests for your application; no universal load rating applies to every assembly.
Learn More →Multi-Shot Molding
Multi-shot molding introduces different materials or colors in successive shots. However, the selected resin pair, tooling arrangement and equipment must suit the component. Request a feasibility review that distinguishes two-shot molding from transfer overmolding. Confirm interface appearance, shot sequence and retention requirements before comparing tooling costs and the repeat production plan.
Learn More →Medical Application Review
Medical applications require a review of intended use, patient contact and material evidence. Insert molding services do not automatically establish device approval or biocompatibility. Specify cleaning, sterilization and traceability needs at quotation. Agree who performs the finished-component evaluation, what samples are required and which reports support your regulatory submission.
Learn More →Automotive Components
Sensor housings and automotive connectors can combine engineered polymers with metal features. Define thermal exposure, fluids, vibration, assembly loads and customer approval requirements. SSP reviews these alongside tooling and inspection needs. Confirm any PPAP package and the applicable supplier quality requirements; automotive suitability must be demonstrated for the specific component.
Learn More →Connector Insert Molding
Connector designs may require terminal encapsulation, insulation, conductive materials or sealing features. These functions need separate acceptance criteria. Specify contact position, electrical clearance, resin grade and intended environmental exposure. Shielding effectiveness, ingress protection and hermeticity are different claims; validate each requested function on representative assemblies instead of assuming molding alone guarantees it.
Learn More →Precision Multi-Material Products Portfolio
This gallery illustrates multi-material designs and SSP's wider tooling portfolio. Use it to discuss geometry, finishes and manufacturing scope rather than as evidence of measured performance. For insert molding services, send the actual component drawing and identify its functional interfaces. Gallery illustrations do not establish a medical approval or tolerance guarantee.
Related Products
Explore insert-molded connectors, contact assemblies and overmolded components. Use these examples to discuss your own material, geometry and assembly requirements.
Insert-Molded Connectors
Metal contacts integrated into molded polymer bodies.
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Contact Carrier Assemblies
Stamped contacts and molded features on carrier strips.
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Molded Sensor Components
Plastic and metal geometry for sensor assembly projects.
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Connector Contact Modules
Contact locations and molded insulation reviewed together.
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Precision Connector Inserts
Defined insert positions and exposed contact surfaces.
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Terminal Carrier Strips
Repeated terminal features for assembly and production.
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Multi-Material Components
Molded parts combining metal and polymer features.
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Overmolded Components
Grip, sealing and threaded-insert component concepts.
Request a quoteMolding Tolerances & Validation Specifications
Define part requirements before selecting a process. Tool machining accuracy is different from the dimensional capability of a finished plastic assembly. Resin shrinkage, geometry, cooling and insert restraint all matter. ISO 20457 addresses plastics molded-part tolerances and acceptance conditions; agree the applicable edition and drawing requirements.
Project Specification Checklist
| Feature | Input Needed | Acceptance Basis |
|---|---|---|
| Part dimensions | Approved drawing | Agreed tolerances |
| Insert location | Datum & fit | Position check |
| Interface retention | Load & geometry | Agreed test |
| Resin selection | Exact grade | Supplier data |
| Thermal exposure | Use conditions | Trial evaluation |
| Surface finish | Cosmetic faces | Approved sample |
| Documentation | Report scope | Order agreement |
What Determines Bond Strength?
For custom overmolding services, bond strength depends on the substrate, overmold grade, interface geometry and processing conditions. Specify the test method, specimen geometry and acceptance limit with your drawing. A peel test and a tensile test measure different responses. Accordingly, insert molding services should use application-specific trial results rather than an unsupported blanket strength figure.
How Is Heat Exposure Reviewed?
Review the assembly's operating temperature, exposure duration and heating or cooling cycles. Different materials can expand and shrink differently, affecting residual stress and fit. Define the trial and conditioning requirements for your use case. Any thermal cycling claim must identify the test conditions, sample quantity and acceptance criteria in the report.
How Are Inserts Located?
Define insert position from functional drawing datums and identify surfaces that must remain exposed. Tool locators should restrain the insert during filling without damaging it. Then check displacement, flash and surrounding wall thickness on trial samples. Agree the measurement method and tolerances for the finished part before releasing insert molding services into production.
Is Medical Compliance Automatic?
Medical compliance depends on the intended use and finished component, not just a resin label. The FDA biocompatibility guidance considers contact type and duration. Specify biological evaluation and sterilization requirements separately. A quality-system certificate does not replace application testing or establish that a device is approved.
Our 5-Step Production Cycle
Use the five stages below to define the deliverables for insert molding services. Approve the drawing revision, material grades and inspection plan before tooling begins. Then distinguish first samples from accepted production parts. This keeps engineering decisions, quotation assumptions and the release criteria connected throughout the project.
DFM Analysis
First, review wall thickness, draft, gates, parting lines and insert access for insert molding services. Identify cosmetic surfaces and assembly-critical dimensions. Custom overmolding services also need substrate support, interface retention and shrinkage review. Record design changes in the approved drawing revision so tooling, sampling and inspection all use the same requirements.
Mold Design & Tooling
Next, select the mold steel, cavity layout and cooling approach for the resin, finish and planned output. SSP's injection molding page lists P20, H13 and S136 tooling options. Confirm the insert loading method and locating details. Tool dimensions and finished plastic-part dimensions require separate acceptance checks during insert molding services.
Trial & Validation
Then, evaluate trial parts for insert molding services against the agreed dimensional, visual and functional criteria. Include insert retention or bond evaluation when specified. Confirm sampling quantities, measurement datums and report scope. Review any defects and tool corrections before approval; simulation or a successful first shot alone does not demonstrate repeat production capability.
Production Run
After sample approval, define the production settings, material handling and insert loading checks. Agree what process data and inspection records are retained. Recheck the component after any approved material, tooling or setting change. For insert molding services, a stable release plan should connect the approved samples to subsequent batch acceptance.
QC & Certification
Finally, inspect the agreed critical features, appearance and assembly function before shipment release. Confirm resin or insert identification, dimensional reports and the certificate of conformance required by the order. ISO 9001:2015 describes SSP's stated quality system; it is not a separate product certificate automatically issued for each molded component.
Resins & Tooling Materials
SSP's injection molding page lists more than 50 resin materials for review. The cards below also include tool steels used to build molds, so they are not all molded resins. Confirm the exact grade, supplier data, availability and process compatibility before quoting insert molding services. Conventional PTFE grades, for example, require a different processing review from melt-processable thermoplastics.
Trusted Across Industries
Our insert molding services support application reviews for medical, automotive, electronics and industrial components. Each sector has different functional and documentation needs. Identify the intended use, critical dimensions and approval requirements early. Select the material and manufacturing route around those needs, then validate the final assembly under agreed conditions.
Surgical & Medical Devices
For medical handles and device housings, specify skin or patient contact, contact duration and cleaning conditions. Overmolding can provide grip or integrated features, but a soft-touch surface does not establish biological safety. Agree resin evidence, sample preparation and finished-part evaluation with the responsible device team before manufacturing approval.
Sensor Housings & Connectors
For automotive sensor housings, insert molding services can integrate contacts or mounting features into a polymer body. Specify position, retention loads, fluids and thermal exposure. Review dimensional stability and assembly fit on trial samples. Any ingress, vibration or environmental claim needs a defined test and an acceptance report for that design.
EMI-Shielded Components
For electronics, distinguish insulation, shielding and environmental sealing requirements. Insert molding can locate conductive contacts while forming the surrounding housing. However, electrical continuity, clearance and sealing should be evaluated separately. Identify the mating components and operating conditions so the trial and inspection plan tests the actual assembled function.
Why SSP's Engineering Team
Sets the Standard
Services Engineering Expertise
Material Science Mastery
Custom overmolding services start with grade-specific material compatibility. Review supplier data, surface preparation and the need for mechanical retention. Define where adhesion matters and how it will be evaluated. SSP's manufacturing review should connect these requirements to the drawing, while trial results confirm the chosen interface rather than assuming every material pair bonds.
CMM & Dimensional Inspection
SSP's injection molding page describes CMM first-article checks and production sampling. Select the measurement method for the actual feature size, datums and accessibility. Insert molding services need checks of both insert location and molded geometry. Agree when optical inspection or another method is necessary; CT scanning is not stated as a universal requirement.
Quality & Documentation Review
Agree material records, inspection reports and any customer approval package when requesting insert molding services. SSP's stated ISO 9001:2015 system supports process documentation, while product-specific approvals require their own evidence. Confirm external testing responsibilities, report scope and cost before manufacture. Do not assume that a supplier certificate covers the complete finished assembly.
Rapid DFM Turnaround
SSP's injection molding page gives indicative T1 timing of 7–15 working days for simpler tooling and several weeks for complex configurations. Request a project-specific schedule for insert molding services. Include drawing approval, material procurement, tool manufacture, trial inspection and correction rounds; sample availability and approved production delivery are different milestones.
Product Manufacturing Expertise
Mold Components & Tooling
SSP's tooling portfolio includes CNC machining, EDM and grinding for mold components. Submit mold dimensions, resin, cavity requirements and the finish needed on each functional face. Confirm the proposed manufacturing scope during quotation. For custom overmolding services, also identify the substrate loading approach and any tooling interfaces needed by the receiving production equipment.
Tool Steel Selection
Select tooling materials and treatment against resin abrasiveness, production volume and maintenance needs. SSP's injection molding page identifies P20, H13 and S136 as mold options. Agree the steel grade, hardness condition and verification documents in the order. A universal hardness claim should not replace the specification for an individual mold component.
Serial Production Scalability
For custom plastic overmolding and metal insert molding services, plan trial quantities, first production orders and annual demand separately. SSP's injection molding page describes standard production orders from 1,000 pieces and smaller prototype programs from 100–500 pieces, subject to quotation. For insert molding services, confirm the applicable batch size, cavity count and inspection plan instead of assuming a fixed minimum or annual output.
Full Traceability & Documentation
Specify the traceability and shipment documentation your project requires. Resin lot details, insert identification, drawing revision and inspection results should refer to the accepted part configuration. Confirm storage and retention requirements in the order. SSP's manufacturing capabilities page describes its tooling, inspection and DFM workflow for further review.
Engineering Capabilities Overview
Use these categories as a project review checklist for insert molding services. The bar lengths are illustrative design elements, not measured performance percentages. Key takeaways: confirm the drawing, resin and insert grade; define critical interfaces; approve trial results; agree inspection and delivery. Capability must be established for the actual component.
Start Your Precision Molding
Project Today
Request insert molding services with your CAD model, dimensioned drawing, substrate or insert specification and expected demand. Identify finish, function and any required test reports. Define the scope of custom plastic overmolding and metal insert molding services in your request. SSP's stated quote-response target is within one business day; tooling completion, validation and dispatch dates are confirmed separately in your project quotation.
ISO 9001:2015
SSP states an ISO 9001:2015 quality system. Confirm the current certificate scope and project inspection documents for insert molding services; specialist product approval or medical testing must be agreed separately.
Quote Response Target
SSP's injection molding page states a 24-hour quote-response target. Send complete drawings and requirements; confirm the DFM scope and delivery schedule in the written quotation.
Global Shipping
SSP's injection molding page describes worldwide delivery by air or sea. Agree packaging, shipping terms, customs documents and destination requirements before the order is released.
Dedicated Team
Identify a project contact and the drawing revision for approval. Agree technical questions, sample review, change control and repeat-order requirements from quotation through production.