Discover
Our Story
A Legacy of Innovation and Excellence
How PLENCO’s History Shapes the Future of Material Science
April 25, 1934
Built on Ingenuity. Driven by Progress.
Frank G. Brotz, along with his five sons, formed Plastics Engineering Company (PLENCO), a family partnership, in Chicago, Illinois. Within months, PLENCO relocated to Sheboygan, Wisconsin, where it continues to operate today.
1940s
Engineering Through Challenge
PLENCO focused its efforts on custom molding and precision manufacturing. During World War II, the company scaled rapidly, supporting U.S. military operations with critical phenolic components used across Army, Navy, and Air Force applications.
1950s
Expanding Capabilities
PLENCO expanded its technical footprint, introducing new resin systems, including melamine and melamine-phenolic compounds, and scaling production to meet growing demand. Facility expansions and dedicated R&D capabilities positioned the Company to respond quickly and reliably to customers across increasingly complex applications.
1990s
Advancing Materials
Growth continued through targeted acquisitions and technology investments. By advancing internal processes, PLENCO strengthened its technical depth and commitment to sustainable manufacturing. The introduction of BMC further expanded its portfolio, enabling high-performance, lightweight alternatives to traditional materials in critical industries.
Today
A Legacy That Powers What’s Next
PLENCO, remains a family-owned business spanning three generations. PLENCO operates with a clear purpose: to create materials that shape the future of innovation. Through continuous investment in technology, close collaboration with customers, and an unwavering commitment to quality, PLENCO delivers precision-engineered materials designed to help customers meet today’s demands and lead what comes next.
Expertise That Empowers Engineering Solutions
Custom Formulations and Industry-Specific Advancements
UL
UL Solutions is a trusted global materials database where PLENCO’s tested and certified thermoset solutions are listed, allowing engineers and designers to confidently evaluate, compare, and select materials based on verified performance data.
ISO 9001
ISO 9001 certification ensures PLENCO’s manufacturing and quality management systems consistently deliver materials that meet rigorous international standards for reliability, traceability, and continuous improvement.
CSA
CSA certification verifies that PLENCO’s materials meet rigorous safety and performance standards for use in electrical and industrial applications across North America.
Responsible Minerals
Conflict Minerals Reporting (CMRT) reflects PLENCO’s commitment to responsible sourcing by documenting that the minerals used in our materials are traced and verified to be conflict-free within our supply chain.
Sustainability Without Compromise
R&D Partnerships for Technical Innovation and Breakthroughs
Eco-Friendly Practices
PLENCO participates in green partnerships with the goal of reducing environmental harm and creating more sustainable manufacturing
Emission Reductions
Through the implementation of new technologies, PLENCO has achieved a 25% reduction in Electricity and Gas usage since 2017
Sustainability Mission
PLENCO’s blends efficiency, innovation, and responsibility to reduce environmental impact while delivering high-performance products
