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

Logo for Amtivo, ISO 13485:2016 Certified for Medical Devices, in a rounded rectangle with a black and white design.
ISO 9001:2015 Certified logo with AMTIVO branding, indicating quality management.
Logo for AMTIVO: AS9100 D Certified, Aerospace, with stylized "AM" symbol inside a rounded rectangle.
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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.

Electronic Insights

A person is holding a motherboard in their hands in a black and white photo.

Field Programmable Gate Arrays (FPGA) Explained

July 7, 2025
Learn how Field Programmable Gate Arrays (FPGAs) work, their types, benefits, and industry applications—from prototyping to high-performance computing.
A bunch of green circuit boards are stacked on top of each other on a table.

Understanding Surface Mount Technology (SMT)

By EI Microcircuits • July 9, 2025
Explore Surface Mount Technology (SMT) in electronics manufacturing—how it enables compact, high-performance assemblies for medical, aerospace, and industrial applications.
A woman is looking at a circuit board with a magnifying glass.

What are Box Build Assemblies in Electronics Manufacturing?

By EI Microcircuits • July 9, 2025
Discover what box build assemblies are in electronics manufacturing. Learn how final product integration—PCBA, enclosures, wiring, testing—boosts quality, speed, and reliability.
A circuit board with the words class 1 2 and 3 on it

Understanding IPC Class 1, 2, & 3 Certifications

By EI Microcircuits • July 9, 2025
Learn the differences between IPC Class 1, 2, and 3 certifications for PCB assemblies. Discover how each class impacts manufacturing quality, reliability, and industry use.

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.