Milwaukee-Area Contract Manufacturer of Precision Plastic and Metal Parts and Components, With Value-Added Services

Dielectric Manufacturing is your single source for plastics and non-ferrous metals contract manufacturing and services, committed to delivering world-class solutions.

plastic contract manufacturingWe offer machining, fabrication and value-added services on a wide variety of materials, including thermosets, thermoplastics, carbon fiber composites, and non-ferrous metals at three locations across Wisconsin and Iowa. Our Centerline Machine business in central Wisconsin excels at machining ferrous metal parts.

Additionally, we are a distributor of unfinished materials.

The advantages of plastic contract manufacturing include:

  • access to specialized expertise,
  • reduced costs and time-to-market,
  • improved production efficiency, and
  • scalability.

Additionally, contract manufacturing allows companies to focus on their core competencies and leave the plastic manufacturing to the experts, like Dielectric Manufacturing.

Plastic Contract Manufacturing
in Wisconsin for More Than 55 Years

Founded by Ray Esser in 1966 under the name Dielectric Corporation, we have extensive experience in the fabrication and machining industry. In 2019 we modified our name to Dielectric Manufacturing to better reflect our breadth of plastic contract manufacturing and metal machining capabilities. We remain privately owned by the Esser family, and continue to grow.

vision, mission, valuesModern Milwaukee-Area Facility
Increases Capacity, Efficiency, Productivity

In 2020, we opened a newly built 100,000-square-foot headquarter facility in Richfield, WI, just northwest of Milwaukee. With this new facility, we are able to offer even greater production efficiencies and provide room for future expansion. Read more. Additional manufacturing plants are in Waupaca, Wis. (handling ferrous metals), and Lake Mills, Iowa.

Plastics and Metals Contract Manufacturer
for Diverse Industries – No Matter the Business Size

Dielectric Manufacturing customers rely on our community of employees to deliver unparalleled, value-added solutions in design collaboration, prototyping, component manufacturing, assembly, packaging, and inventory services for plastic parts and non-ferrous metal parts.

A Standout Among Plastic Manufacturing Companies

The highly knowledgeable Dielectric Manufacturing team is known for being a reliable and attentive contract manufacturer to a wide variety of businesses, including Fortune 500 companies. Among the various plastic manufacturing companies, Dielectric Manufacturing stands out for its reliability and performance.

Custom precision components and assemblies that we manufacture are used in equipment for these leading industries:

  • Aerospace
  • Agriculture
  • Defense
  • Electrical
  • Food Processing
  • Gas & Oil
  • Health Care – Medical Equipment
  • Power Generation and Distribution
    • including Wind Power
  • Power Sports

When you are considering plastic manufacturing companies for parts or components, contact Dielectric Manufacturing for a quote on a project, or to learn more about our full range of services. Call 800-367-9122, use our Quick Contact form, or our Request a Quote form for plastic parts.
Leave a Google Review about our precision fabrication.

“Our Dielectric Manufacturing sales rep pays a lot of attention to us. He makes me feel like it’s more of a partner relationship and not just a vendor situation.”

Dielectric Manufacturing Knowledge Base


Learn about plastic, metal and composite properties and the characteristics that make various materials appropriate for parts.

contact Dielectric Manufacturing


Need more information about plastic, carbon fiber or metal component fabrication and assembly? For contract manufacturing and more, call us in metro Milwaukee at 800-367-9122, or email

Contract Manufacturing
Value-Added Services

  • Design collaboration
  • Prototyping of plastic parts and metal parts
  • Welding
  • Flame polishing, buffing and sandblasting
  • Painting and silk screening
  • Special finishes
  • Insertion of component elements
  • Complete assembly and sub-assembly
  • Kitting/Packaging –ranging from assembly kits to complete finished packaging
  • Inventory management
  • Delivery programs

Dielectric Manufacturing holds ISO 9001-2015 certification.

See our ThomasNet directory listing.