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    Advanced Thermoset Materials
    High-performance thermoset materials, proudly made in the USA and trusted worldwide
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    Proven Across Industries
    Proven materials for the transportation, electrical, infrastructure, and industrial sectors
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    Custom – Formulated Compounds
    Materials designed to meet your standards for strength, performance, and process efficiency
90+ years of experience

Proven Expertise in Phenolic Resin Innovation.

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Proven Success in Every Industry

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Todd Kocher image

Their technical support and customer service sets them apart from other suppliers.

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Todd Kocher

PLENCO is a great company to work with.  Their technical support and attention to customer service really sets them apart from our other suppliers.

https://www.mcmusa.net/

Todd KocherProduction Manager, MCM Composites
Todd Kocher
Production Manager, MCM Composites
Reliable
Customer service and support
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PLENCO goes above and beyond

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Eric DePriest

PLENCO is, and has always been, very responsive to our needs.  CARBO Ceramics appreciates PLENCO for consistently “going above and beyond”.  PLENCO is a key supplier for CARBO and it is a pleasure doing business with their team.

https://carbo.tech/

Eric DePriestPlant Manager, CARBO
Eric DePriest
Plant Manager, CARBO
Key Supplier
For ceramic solutions
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PLENCO has truly become CAP ‘s material partner.

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Chad Nunnery

PLENCO has truly become CAP ‘s material partner.  They formulated our product and ensured it molded well with their team assisting at our Texas-based operation.  Their technical experts continued product improvements with better UV resistance and reduced cycle times.  Recently, the production team was able to ship an urgent truckload to CAP within one day, exceeding expectations!  I would highly recommend sourcing materials from PLENCO for quality, service, growth, and to know a great group of people.

https://www.justcapthat.com/

Chad NunneryPresident & Co-Founder, CAP
Chad Nunnery
President & Co-Founder, CAP
Exceeding Expectations
Improved products and fast shipping
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For almost two decades, our collaboration with PLENCO has been nothing short of exceptional.

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Ben Ashe

For almost two decades, our collaboration with PLENCO has been nothing short of exceptional.  Their entire team has demonstrated the kind of support, experience, and innovation that stem from core values centered around customer success.  Len and his team have provided our growing business a key element of supplier partnership that has accelerated our achievements.  We are incredibly grateful for the relationship we share!

https://mdminc.com/

Ben AshePresident, Multi-Duti Manufacturing, Inc.
Ben Ashe
President, Multi-Duti Manufacturing, Inc.
20+ Years
Partnership and Success

Expertise at Your Fingertips

Your knowledge hub for materials and innovation.
Business
2018-09-27 at 13-01-09_compressed

PLENCO Unveils New Brand Identity & Website Following 90+ Years of American Manufacturing Leadership

PLENCO’s New Brand Identity Sheboygan, Wis., April 02, 2026 – Plastics Engineering Company, PLENCO, an American manufacturer of high-performance thermoset resins and composites, today unveiled a new brand identity and corporate website, marking a strategic evolution aligned with its role in advancing modern industry. For more than 90 years, PLENCO has engineered and manufactured thermoset…
Business
Vibrant green leaves in the foreground with a blurred industrial manufacturing facility and bright sun in the background.

PLENCO Achieves 25% Energy Reduction Goal Through DOE Better Plants Initiative

PLENCO has officially achieved its goal of reducing energy consumption by 25% through participation in the U.S. Department of Energy’s Better Plants initiative. The milestone marks nearly a decade of collaboration, operational improvements, and efficiency-focused projects across the company’s manufacturing operations in Sheboygan, Wisconsin. PLENCO joined the U.S. Department of Energy’s Better Plants initiative in…
Business
Row of 4 tires made using PLENCO materials

Modernizing Tire Performance Through Materials Engineering

How PLENCO & Leading Tire Manufacturers Are Engineering Rubber for the 21st Century The tire production sector is well established and technically complex. At the same time, the demands placed on tires have increased significantly. Increased vehicle mass, evolving powertrains, longer service life requirements, and greater safety expectations now push tire systems beyond traditional boundaries….
Company Information
Historic photo of an old PLENCO building

History of PLENCO

Built on Ingenuity. Driven by Progress. Plastics Engineering Company (PLENCO) began in 1934 as a family partnershipfounded by Frank G. Brotz and his five sons. What started as American MoldedProducts in Chicago quickly became a focused pursuit of engineered materialsinnovation. Early work concentrated on thermosetting liquid resins used in everydaymolded components, laying the foundation for…