Custom Plastic Insert Molding Services for Thermoplastic Components
JDI Plastics specializes in manufacturing custom thermoplastic components for medical, electronic, and industrial uses. Since 1995, we have helped engineers and purchasing managers source difficult-to-mold parts with complex geometries, specified materials, and tight production needs.
Insert molding is a process that combines separate components, such as metal or ceramic inserts, with a thermoplastic resin in a single molding step. This means a solid component, such as a metal part, is placed inside a mold and thermoplastic material is then injected around it to form the final part. This technique creates lightweight plastic parts with specialized functional properties, such as enhanced mechanical strength, electrical conductivity, or superior fastening performance. It also eliminates secondary assembly operations, reduces total production cycle times, and enhances overall part reliability.
JDI Plastic’s Insert Molding Capabilities
JDI Plastics manages the entire insert molding lifecycle, from initial material review through final quality verification. It is ideal for incorporating:
- Threaded inserts and bushings
- Electrical pins, contacts, and terminals
- Reinforced structural connection points
Advanced Material Bonding & Resin Selection
Material selection affects bond strength, dimensional stability, and long-term performance of produced parts. We work with thermoplastics suited for insert molding, including:
- Nylon (PA). Formulates strong mechanical bonds with knurled or grooved inserts and provides excellent chemical resistance.
- Polycarbonate (PC). Delivers high impact resistance for components utilizing threaded inserts or brass fittings.
- ABS. Provides a cost-effective choice for applications requiring moderate mechanical strength and a clean surface finish.
- PEEK and LCP. Support insert molding electronics, aerospace parts, and high-temperature applications
- And many more
Insert preparation also matters. Knurling, surface texturing, chemical treatment, and undercuts can help resin lock more securely around the insert.
Precision Tooling & Production
Plastic insert molding requires mold designs that account for insert placement, resin flow, cooling behavior, and part ejection. JDI Plastics coordinates tooling requirements and maintains transferred molds in-house to support consistent production.
Our facility includes 20 injection molding machines for different part sizes and production needs. We specialize in smaller precision components, but we can also support larger molded parts depending on the application.
Each production cycle follows a controlled process. Inserts are loaded into the mold, molten resin is injected around them, and the finished part ejects after cooling.
Quality Control & Tolerance Verification
We review insert position, bond integrity, and dimensional accuracy throughout production. Visual inspection confirms proper insert seating, while pull testing can validate bond strength against project requirements.
Dimensional checks help confirm that critical features remain within tolerance. Threaded inserts need proper alignment with mating fasteners. Electrical contacts in insert-molded electronics also require precise placement for reliable connections.
Our ISO 9001 certified quality management system supports consistent production practices. Our ISO 13485-compliant processes also support medical device production needs, where applicable.
Applications of Plastic Insert Molding by Industry
Medical Devices
Medical parts may require smooth surfaces, tight tolerances, and reliable bonding between plastic and metal elements. Plastic insert molding can support surgical instruments, diagnostic equipment housings, drug delivery components, and other medical assemblies.
Electronic Components
Insert molding electronics often require the precise placement of pins, terminals, contacts, shields, or threaded hardware inside plastic housings. The molding process locks these features into position and helps reduce loosening from vibration, handling, or thermal cycling.
Automotive Parts
Automotive components often need strong, vibration-resistant assemblies that tolerate heat, moisture, and repeated mechanical stress. Insert molding can support dashboard controls, sensor housings, electrical connectors, clips, and fastening components.
Partner with JDI Plastics for Custom Insert Molding Today
Since 1995, JDI Plastics has resolved complex manufacturing challenges for difficult-to-mold thermoplastic components. By integrating metal or ceramic elements directly into the injection molding process, we deliver components featuring tight tolerances and robust material bonds.
Our team supports plastic insert molding for electronics, assemblies, medical components, and other applications that require reliable plastic-to-metal or ceramic-to-plastic bonding. We also provide secondary in-house services such as ultrasonic welding, heat staking, mechanical assembly, pad printing, custom labeling, bar coding, and custom packaging.
Contact JDI Plastics to discuss your insert molding project, material requirements, production volume, and timeline.