Marinette, WisconsinMolding & tooling
Injection molding, insert molding and overmolding. Tooling support from first review to mold-build project management.
Explore molding & toolingInjection molding in Marinette, Wisconsin
Injection molding.
From tooling to
finished parts.
Family-owned manufacturing in Marinette, Wisconsin. Molding, printing, assembly and shipping, built around your part.
Molded around your needs.
17 presses90 to 650 tonsISO 9001:2015Marinette, Wisconsin
01Capabilities
Molding and
production support.
Plan the molded part and the work that follows it together, from tooling and material selection through finished assemblies and delivery.
Printing & assembly
Pad and UV printing, sonic and heat welding, machining, labeling and assembly.
Explore printing & assemblyPackaging & fulfillment
Inventory management, packaging and direct or on-demand shipping.
Explore packaging & fulfillmentMaterials & engineering
Material selection, engineering support, and prototype and short-run additive support through Variety Vault and its partner network.
Explore materials & engineeringExplore material experience and resin options
Material experience
Acetal (Delrin) is a major production material for us.
- Most run
- ABS, PC/ABS, ASA
- Engineering
- Nylons, PC, PS, PP, PPS, acetal (Delrin)
- Elastomers
- TPE, TPU, TPV
- High performance
- PEEK, ULTEM and glass-filled grades
- Also
- PE, HDPE, PETG and injection-moldable UHMW
Resin grade, tooling and application determine suitability, including injection-moldable UHMW and BPA-free options. Virgin resin, regrind and recycled/reprocessed polycarbonate use follow customer requirements. Closed-loop chillers recirculate process cooling water.
Pioneer Plastics' goal is to be a Per- and Polyfluoroalkyl Substances (PFAS) Free Company. This is a company goal, not a product or company certification.
02Parts
Built into
the part.
A closer look at molded shapes, surface details and part geometry.
03Equipment
A fleet built
around your part.
Injection molding from 90 to 650 tons, with two electric presses and pickers.
17Presses
90 to 650Tons
65%Utilization reported October 2026
Confirmed press fleet
- 90 tons11 presses
- 100 tons1 press
- 250 tons2 presses
- 500 tons2 presses
- 650 tons1 press
Room for new programs. Discuss current availability with Alex.
Equipment referencePickers
Our machines are equipped with pickers.
Electric molding
Two of our 17 presses are electric and operate in a positive-pressure white room. Their sizes have not been supplied.
Tooling network
Wisconsin, domestic and global tooling network, including in-mold inserts and fabrics and mold-build project management.
Tooling and mold setup.
Review your part, existing tooling and production needs with our team.
MoldsAny part.
Any part.
Idea to production.
Single and multiple cavities, MUD bases, hot runners and in-mold inserts. We manage the mold build, then mold, assemble and ship your part.
04Quality
Inspection that
supports production.
ISO 9001 certified since 2014, now to ISO 9001:2015. Amtivo certificate 265862, valid through August 2, 2029, subject to annual assessments. In-house first-article inspection with a Micro-Vu vision system, and PPAP.
Our inspection setup.
Our in-house optical inspection supports first-article inspection and production quality checks.
05Assembly & shipping
From assembly
to shipment.
Assembly, purchased components, packaging, inventory holding and direct shipping support the work after molding.
Your project
A clear path
to production.
- 01
Bring the part
Share your drawing, intended use, expected volume and timing.
- 02
Review the details
Discuss material, tooling, quality requirements and secondary operations.
- 03
Plan production
Agree the scope, inspection needs, packaging and delivery requirements.
- 04
Mold and deliver
Connect molding with printing, assembly and fulfillment as your program requires.
06Company
Family owned.
Production focused.
We're a family-owned business in Marinette, Wisconsin. Pete and Kristine Aretz purchased Pioneer Plastics from Chris Stuart in May 2013. Today, our sons Pete Jr., Alex and Ben work alongside us.
Programs of any size, from one part to two million.
Our history
From one small machine.
Chris Stuart started the company in his family's garage in Marinette, Wisconsin, with one small machine and a dream of building his own business.
We've been servicing Wisconsin and beyond for over 25 years, serving industrial, aerospace, sports and recreational industries.
Pete has over 35 years in the plastics industry, with a strong manufacturing, quality and engineering background.
We support your cost-saving efforts with engineering support, inventory management, conversion of steel to plastic and added-value assembly.
Family ownedand operated since the 2013 purchase17presses, 90 to 650 tonsUtilization reported October 2026
Supplier resources
The details.
Ready to share.
Download our capabilities, product examples and current quality certificate.
Capability sheet
Our processes, press range, materials and production support. Two pages.
Open capability sheet ↗Product lookbook
A visual introduction to molded components. Two sides.
Open lookbook ↗ISO certificate
ISO 9001:2015. Amtivo certificate 265862; valid through August 2, 2029, subject to annual assessments.
Open certificate ↗
Molded around your needs.
07Contact
Discuss your next
production program.
Bring the drawing, material, expected volume and timing. Review tooling, production and the supporting services your program needs.
(715) 735-3532
3513 Parcek St., Marinette, WI 54143
Alex Aretz
General Manager
alex@pioneerplasticswi.com
Office: (715) 735-3532
Cell: (715) 977-7053
What brings you to Pioneer?
A new part Drawing, material, volume and timing ↗Existing tooling Tool details and production requirements ↗Molding and more Printing, assembly, packaging and shipping ↗
Opens your email app to Alex Aretz, General Manager. Add your project details and attach drawings there. Prefer a conversation? Call (715) 735-3532.