ABOUT

INNOVATION BUILT ON TRUST

Since the mid-20th century…
Since the mid-20th century, the companies of Cornerstone Composites, Inc. have helped OEMs find stronger solutions for their custom parts molding needs. Wisconsin Thermoset, Inc., and Rose Polymer Composite operated independently from 1941 and 1961, respectively. Their merger in 2015 strengthened the service opportunities of both companies exponentially. Customers trust Cornerstone Composites, Inc., because we blend a next-generation passion for innovation with old-fashioned values like honesty, openness and collaboration.

Put simply: we don’t lie. We don’t cheat. Happy customers tell us that our people are our most valuable resource.
Cornerstone’s first priority is helping you find the right material for your project—even if that doesn’t turn out to be ours. For most customers, high-strength formulations along with optimal technical design will offer significant benefits over metal or plastic parts, at times rivaling the strength of light steel.
If you are switching from metal or plastic to composite, we understand the uncertainties that surround this decision.

We are here to help you walk into the future safely, step by step, with these amazing formulations.

Cornerstone Mission and Vision

Mission (Purpose, why we exist)

To redefine what’s possible in composite manufacturing—partnering with innovators across aerospace, energy, and industry to solve the toughest challenges utilizing molded composite solutions that lead in strength, precision, and performance.

Vision (Where we are going)

To be the premier composite molder – known not just for the parts we make or the innovation we bring but for how we work: with integrity, precision, collaboration, and people-first culture.

Core Values

Integrity

We uphold the highest standards of honesty, ethics, and accountability in everything we do. Integrity means doing the right thing, even when no one is watching. It guides our decisions, fosters trust with our stakeholders, and ensures that our actions align with our values. We are committed to transparency, fairness, and consistency in our behavior, both individually and as an organization.

Ferocious Passion

We show up with energy, enthusiasm, and a deep commitment to our work. Our passion drives us to take initiative, grow through challenges, and constantly seek ways to improve ourselves and the team. We inspire those around us by striving to be better every day.

Respect

We value each person’s voice, time, and perspective. We listen with empathy, communicate with honesty, and treat everyone with dignity—fostering a culture of trust, inclusion, and collaboration.

Collaboration

We work together with openness, trust, and shared purpose—across teams, with our customers, and with our suppliers. By valuing diverse perspectives and building strong partnerships, we create stronger solutions and deliver greater impact.

Fun

We believe that enjoying our work and celebrating wins—big or small—builds stronger teams and a vibrant culture. Fun fuels creativity, connection, and a positive environment where people thrive.