Sourcing a molder for a housing that carries circuitry differs from sourcing a generic plastic part. Bosses, snap features, gasket grooves, and connector cutouts have to land where the board expects them, and small amounts of drift can leave an assembly unable to seat.
That makes supplier selection for electronics enclosure molding a question about the business as much as the part. The six companies below are all U.S. custom contract molders, meaning a customer hires them to build a tool and mold a part rather than buying a housing from a catalog. They are listed by how much of the surrounding product they can take on, not by size.
- DEM Manufacturing
Founded in 1993 in Newbury, Ohio, DEM Manufacturing began as an injection molding business and grew into a vertically integrated electro-mechanical manufacturer. Design, engineering, tooling design and fabrication, molding, printed circuit board assembly, custom cabling, and final assembly all sit inside one facility, with no outsourcing.
That matters most when a housing and the electronics inside it are developed together, since the people answering a fit question are the people building the housing and the board. DEM holds ITAR registration, ISO 9001:2015 and ISO 13485:2016 certification, and CAGE code 52CQ1, and serves military, medical device, law enforcement, and first responder programs. Flexible tooling lets early builds run on aluminum or printed molds before a program commits to steel.
- Ferriot Inc.
Operating from Akron, Ohio, and privately held since its founding in 1929, Ferriot runs a 200,000-square-foot office and manufacturing facility and provides plastics contract manufacturing for original equipment manufacturer clients.
Its served markets are unusually broad for a molder, covering medical and diagnostic equipment, industrial automation and energy systems, electronics, commercial business equipment, electric vehicle charging infrastructure, and building products. The company holds ISO 9001 certification.
Ferriot also sells a branded building products line of its own, so contract molding is one of several businesses under the roof rather than the sole focus. Buyers wanting a supplier concentrated entirely on contract work may prefer a narrower shop.
- PTI Engineered Plastics
Founded in 1984 and based in Macomb, Michigan, PTI is a privately held molder with more than 200 employees working from a 160,000-square-foot facility that includes ISO Class 8 cleanroom space.
Its credential set is among the deepest on this list: ISO 9001, ISO 13485, MedAccred accreditation, ITAR registration, and FDA registration. The company serves medical, defense and aerospace, and commercial and consumer markets, and added an in-house design arm in 2010.
The weighting leans medical. Defense programs will still find the registrations required, though several of PTI’s strongest credentials address regulated healthcare work.
- Kaysun Corporation
Based in Manitowoc, Wisconsin and founded in 1946, Kaysun is a custom molder serving medical, industrial, automotive, consumer, and aerospace and defense customers, with ISO, IATF, and ITAR credentials and tool design and build handled internally.
The automotive exposure sets it apart from most molders on this list and brings volume discipline with it, which suits programs expecting to scale.
Kaysun is a molding specialist rather than an electronics assembler. Board work, cabling, and final integration route to separate suppliers, which puts the coordination burden back on the buyer.
- Crescent Industries
Located in New Freedom, Pennsylvania with more than 75 years in business, Crescent is fourth-generation family-owned and also employee-owned, a structure that is uncommon among molders of its size.
It holds ISO 13485:2016 certification and ITAR registration, and serves medical and pharmaceutical, defense and military, and industrial markets. The company builds its own molds alongside molding the parts, so tooling and production answer to one organization.
As with Kaysun, electronics work sits outside the scope. A program sourcing housing, board, and harness together will be managing more than one supplier.
- Nicolet Plastics
Founded in 1986, Nicolet works from two Wisconsin facilities in Mountain and Jackson, totaling roughly 72,000 square feet across 46 molding presses. It holds ISO 9001:2015 certification and serves equipment manufacturers in commercial goods, industrial products, medical equipment, and sporting goods.
Nicolet lists no defense registration, so a program handling controlled technical data would have to look elsewhere. Its market mix also sits further from regulated work than the others here.
Narrowing the Field
These six do not compete for identical work. PTI and Crescent carry the regulated-market credentials, with PTI weighted toward medical and Crescent split between medical and defense. Kaysun brings automotive volume experience. Ferriot handles the broadest market spread and the largest facility. Nicolet suits commercial and industrial work without controlled data requirements.
DEM Manufacturing is the one entry here that also assembles the electronics, which fits programs where the housing, the board, and the cabling are being designed at the same time. Supplier selection for electronics enclosure molding narrows quickly on that point. Where a buyer already has a finished enclosure design and in-house electronics, that integration matters less, and a dedicated molder may price the part more competitively.
Three questions separate suppliers faster than a capability comparison. Who designs and owns the tool, what happens to it if the relationship ends, and what a second tool costs if volumes climb.
