Where Strength Meets Precision.
Welcome to Keystone Sheets.

Keystone Sheets is a proud member of the Corrugated Partners Group, giving our employees and customers access to a powerful network of innovation, support, and opportunity.

We’re located in Chambersburg, PA—a region with deep roots in the packaging industry—and we’re proud to carry that legacy forward with modern technology, forward thinking, and a culture grounded in respect, recognition, and growth.

At the heart of our facility is a 132″ BHS corrugator—the widest in the country capable of producing triple-wall board. This ultra-wide platform allows us to manufacture a full range of corrugated sheets in singlewall, doublewall, and heavy-duty triplewall configurations, using multiple flute and liner combinations—all with fast, reliable turnaround and next-day delivery options.

And while many people call it “cardboard,” that’s not what we make.

We make the engineered corrugated sheets that converters and boxmakers rely on. Cardboard is typically a single layer of paperboard used for things like cereal boxes or folders. In contrast, corrugated sheets are multi-layered, fluted materials built for strength, durability, and protection—especially in industrial, bulk, and export packaging applications.

At Keystone Sheets, our focus is simple:
Deliver the highest-quality corrugated sheets with precision, reliability, and speed—every time.

We’re not following the industry. We’re helping shape what comes next.