pcb overmolding

EI offers in-house premolding and overmolding with a wide variety of materials—a unique capability in the EMS industry that adds durability, protection, and integration without relying on third-party vendors.

materials we can overmold

EI offers premolding and overmolding of a wide variety of materials in house utilizing a 25 ton vertical injection molding machine. Overmolding protects circuit boards from environmental concerns while allowing full color customization and streamlining the outer appearance of the finished product. The overmold can incorporate company logos, approvals information and even graphics.

certified excellence you can trust

Partner with EI Microcircuits—certified to the highest industry standards and trusted across medical, defense, and industrial markets for precision, quality, and compliance.

applications of overmolding

medical

We overmold medical PCBs for added protection, biocompatibility, and enhanced device durability in clinical environments.

industrial

Our overmolding solutions create tough, sealed PCB assemblies built to endure industrial stress and exposure.

energy

EI Micro’s overmolding safeguards energy system PCBs against moisture, vibration, and extreme operating conditions.

agriculture

We overmold PCB assemblies for agriculture to ensure field durability, weather resistance, and long-term reliability.

EI Microcircuits builds high-layer count, high-performance assemblies for the emerging AI market. Our advanced SMT and quality systems ensure reliable, complex builds for HPC applications.

aviation

Our aviation overmolding process delivers lightweight, shock-resistant PCB assemblies ready for airborne performance.

military

We use advanced overmolding techniques to protect mission-critical electronics from shock, moisture, and operational extremes.

Security and Surveillance

Overmolded assemblies support surveillance systems with discreet, rugged protection designed for 24/7 operation.

through-hole

Durable, high-reliability assembly for rugged and high-power applications.

inspection

Ensures precision, quality, and compliance at every production stage.

box build

EI offers a wide range of box build services including full electromechanical assembly.

overmolding

EI offers premolding and overmolding of a wide variety of materials in house.

potting

Protects electronics from moisture, vibration, and harsh environmental conditions.

our certifications

ISO 13485:2016 certified badge, AMTIVO logo, text "Medical Devices".
Logo for AMTIVO. ISO 9001:2015 Certified for Quality Management. Features a stylized "A".
A square badge with "AMTIVO" logo and "AS9100 D Certified Aerospace" text.
Blank white canvas.
White background.
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hear it from our customers

"A delightful company to work with. Could not have done it without your expertise."

"EI excels in responsiveness, support and flexibility. I very much appreciate EI’s ability to adapt on the fly."

"I appreciate the work EI does most of all because it makes my job easier."

"Overall, EI does a great job in dealing with everything we throw at them. They are responsive and understanding of us, even though it may not always be the most reasonable of requests. As a buyer, I feel lucky to have a supplier that works with us like they do."

"Working on a project that had a board that was simply not manufacturable the way it was set up, EI went above and beyond to help with engineering and still met a very short deadline."

Two women in a factory soldering circuit boards at a workbench.

Overmolding FAQs

  • Why use overmolding on electronic assemblies?

    Overmolding can provide mechanical protection, strain relief, environmental protection, and a durable interface around electronic components, cables, or assemblies. Material and process selection should reflect the product's operating environment and mechanical requirements.

  • What materials are used for electronic overmolding?

    Material selection depends on temperature exposure, chemical resistance, flexibility, adhesion, electrical properties, and environmental requirements. The selected material must also be compatible with the PCB, components, wires, connectors, and other materials in the assembly.

  • Can PCB assemblies be overmolded?

    Yes. PCB assemblies can be overmolded when the design, component selection, masking requirements, pressure limits, thermal conditions, and material compatibility are considered during process development.

  • What is the difference between overmolding and potting electronics?

    Overmolding generally uses a molding process to form a defined protective structure around an assembly or portion of an assembly. Potting typically fills a housing or cavity with a liquid compound that cures around the electronics. The appropriate method depends on environmental protection, mechanical requirements, geometry, rework needs, and production process.

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let's talk

EI Microcircuits operates multiple climate-controlled facilities designed for scalability, technical excellence, and built-in disaster resilience—each fully equipped to support today’s most advanced electronic assemblies. Let us be the solution to your next project—Contact Us, Request a Quote, or Schedule a Tour today!

Contact Us Today

MANKATO, MN

1651 Pohl Road
Mankato, MN 56001

P:
 507.345.5786

ST. PETER, MN

2011 Klein Street
St. Peter, MN 56082

P:
 507.934.5722

MANKATO, MN

69 Power Drive
Mankato, MN 56001

P: 507.386.9160

*Each facility is configured to support your production needs. While maintaining continuity with each other in equipment, training and process control. All facilities share the same data center to allow for seamless manufacturing between locations.