Injection Molding & Protective Coatings for Electronics that Last

Robust packaging and environmental protection are essential for electronic assemblies that operate in real-world conditions. At Foxtronics EMS, our injection molding and coating services are engineered to provide supporting functional integration, mechanical strength, and long-term reliability.

We mold precision plastic housings and overmolds using high-performance resins such as ABS, polycarbonate, nylon, and glass-filled blends tailored to meet the mechanical, thermal, and aesthetic demands of your application. These custom-molded components can be designed to interface seamlessly with your PCBAs, connectors, and mechanical sub-assemblies, streamlining the final build process.

To protect internal circuitry from moisture, dust, vibration, and thermal extremes, we offer a range of coating and potting solutions. From selective conformal coating to full encapsulation, each process is optimized for adhesion, coverage, and process control, ensuring reliable performance in mission-critical environments.

Whether you’re building industrial controls, automotive modules, or outdoor IoT devices, our integrated molding and coating services help reduce part counts, improve assembly efficiency, and safeguard your electronics every step of the way.

Injection Molding and Coating in EMS

What is Injection Molding?

Injection molding is a manufacturing process used to produce precise, repeatable plastic components by injecting molten material into custom-designed molds. In electronics manufacturing, it’s commonly used to create enclosures, overmolds, and structural components that protect, support, and interface with PCBAs and mechanical parts. It enables integrated features like clips, strain reliefs, seals, and mounting points, reducing part counts and streamlining final assembly.

What is Coating?

Coating and encapsulation processes safeguard electronic assemblies from harsh environmental conditions. This includes conformal coating for selective surface protection, potting for full encapsulation of components, and overmolding for additional mechanical shielding. These protective layers improve resistance to moisture, dust, vibration, and thermal cycling, extending product life and performance reliability.

Our Capabilties

We deliver engineered plastic solutions and protective coatings tailored for high-performance electronics. Whether it’s custom-molded enclosures or conformal coatings that protect against environmental stress, our capabilities are built for reliability, repeatability, and integration with your full assembly workflow.

Our molding and coating processes are tightly controlled for thermal uniformity, material flow, and adhesion, ensuring every part meets dimensional, cosmetic, and functional requirements. From precision gating to curve profile optimization, we engineer consistency into every cycle.

Injection Molding Capabilties

  • Custom Mold Design & Fabrication
    In-house design support and tooling coordination for single-cavity, multi-cavity, and family molds tailored to electronic assemblies.
  • Material Expertise
    Support for a range of engineering plastics, including ABS, polycarbonate, nylon, glass-filled resins, and high-temperature thermoplastics.
  • Tight Tolerance Molding
    High-precision equipment ensures dimensional accuracy and repeatability for complex geometries and interlocking features.
  • Insert & Overmolding
    Ability to mold directly over metal parts, cables, or electronic sub-assemblies—ideal for strain reliefs, grommets, and connector protection.
  • Integrated Assembly Readiness
    Molding designed with downstream PCBA integration in mind—optimized for fit, thermal performance, and mechanical durability.

Coating & Encapsulation Capabilities

  • Selective Conformal Coating
    Acrylic, silicone, and urethane coatings applied via spray, brush, or automated methods with masking precision for critical components.
  • Potting & Encapsulation
    Epoxy or polyurethane materials are used to encapsulate sensitive assemblies, improving durability and vibration resistance fully.
  • Overmold Protection
    Mechanical overmolding for cable strain reliefs, sensor packaging, or housing protection against environmental and mechanical stress.
  • Thermal & Environmental Performance
    Coatings selected and applied to meet thermal cycling, chemical resistance, and ingress protection requirements (IP-rated designs).
  • Visual & Functional Inspection
    In-process inspection with UV traceability for coating coverage and complete documentation for quality assurance and traceability.
Satellite in space representing Foxtronics EMS electronics manufacturing for aerospace and critical industries.

Applications & Industry Use Cases

Injection molding and protective coating are essential to building durable, high-functionality products across industries where reliability, aesthetics, and performance are non-negotiable. Whether it’s a rugged housing for industrial electronics or a sleek medical enclosure that meets hygiene standards, our solutions are designed to serve mission-critical applications with confidence.

Common Applications

  • Industrial & Automation
    Custom enclosures, switch housings, cable organizers, and mechanical interfaces built for durability in harsh factory environments.
  • Medical Devices
    Smooth, cleanable surfaces for diagnostic equipment, handheld devices, and electronic enclosures requiring chemical resistance and hygienic finishes.
  • Automotive & EV Systems
    High-precision plastic components for sensor mounts, interior trims, and wire routing—plus coatings for thermal and moisture protection.
  • Consumer Electronics
    Aesthetic and structural parts for smart home devices, wearables, and control panels with tight cosmetic and dimensional specs.
  • Defense & Aerospace
    Encapsulated electronics, coated assemblies, and rugged molded parts built to meet MIL-STD environmental and mechanical requirements.
  • Power & Energy
    Overmolded cable assemblies and coated PCBs used in power supplies, energy storage systems, and renewable energy electronics.

Our Portfolio

From precision-molded housings to rugged coated assemblies, our portfolio demonstrates expertise in precision, protection, and adaptability, delivering consistent quality across high- and low-volume builds.

Why Foxtronics EMS?

Foxtronics EMS combines precision, reliability, and scalability to deliver high-performance PCB assembly solutions. With decades of experience, advanced facilities, and engineering expertise, we add value across every stage of your product’s lifecycle.

Diverse Industry Expertise

Diverse Industry Expertise

With over 116 years of combined experience, Foxtronics EMS serves industries such as aerospace, medical, industrial, and automotive. Our AS9100, ISO, and ITAR certifications ensure compliance with the highest quality and regulatory standards, allowing us to meet the demands of mission-critical applications.

End-to-End Solutions

End-to-End Solutions

From initial design to final delivery, we offer complete lifecycle support. Our in-house engineering team provides DFM and early design consultation to optimize manufacturability, reduce risk, and accelerate time-to-market—ensuring a smooth transition from concept to scalable production.

Turnkey Assembly Services

Turnkey Assembly Services

Foxtronics EMS provides fully managed turnkey solutions, including component sourcing, SMT and through-hole assembly, box builds, and testing. This approach simplifies supply chains, reduces vendor dependency, and ensures consistent quality at every stage.

Advanced Manufacturing

Advanced Manufacturing

Our state-of-the-art facilities are designed to handle complex PCB assemblies with exceptional precision and reliability. Automated systems, high-speed SMT lines, and rigorous process controls ensure consistent quality and scalability, supporting the most intricate and demanding production requirements.

Comprehensive Testing

Comprehensive Testing

Quality assurance is built into every step of our process. We utilize AOI, X-ray inspection, in-circuit, and functional testing to detect defects early and ensure long-term reliability. Our inspection protocols align with IPC and AS9100 industry standards.

Efficient Lead Times

Efficient Lead Times

With flexible production and streamlined workflows, we offer rapid prototyping and efficient scaling for diverse production needs. Whether for low-volume prototypes or high-volume runs, our responsive team ensures fast, reliable delivery without sacrificing quality.

Inside Our Facilities

Our molding and coating operations run in controlled environments equipped with automated injection presses, precision tooling, and dedicated coating lines. With in-house tooling support and real-time quality monitoring, we ensure every part meets exacting standards for durability, consistency, and finish.

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FAQs

From material selection to coating compatibility, our FAQ section answers common questions about injection molding and protective coating services. Whether you're new to custom molding or looking to scale production, these insights help clarify processes, timelines, and technical considerations.

We work with a variety of thermoplastics, including ABS, polycarbonate, nylon, PBT, and glass-filled resins, selected based on mechanical, thermal, and chemical performance requirements.

Yes. We offer both overmolding and insert molding capabilities, enabling multi-material designs or integration with metal components such as threaded inserts or busbars.

Tooling lead times typically range from 3 to 6 weeks, depending on part complexity. Once the tool is ready, production runs can begin with short turnaround times.

We provide conformal coating (such as acrylic, silicone, and urethane) and potting solutions to protect electronics from moisture, dust, vibration, and chemical exposure.

Our facility uses precision molding machines, automated monitoring systems, and in-process inspections to maintain dimensional accuracy and repeatability across production batches.

Yes. We offer tooling solutions and molding processes tailored for low-volume production, prototyping, and pre-production validation runs ideal for iterative design or niche applications.