About Us

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Powering Corrugated Innovation from the Heart of Pennsylvania

Keystone Sheets is strategically located in Chambersburg, PA, to serve boxmakers and converters across the Mid-Atlantic and Midwest. As part of the Corrugated Partners Group (CPG), we’re backed by a powerful national network of 16+ sheet feeders and 18 corrugators—all working together to keep customers supplied and successful.

Our corrugator is one of the first and few 132” triple wall capable machines in the country. It is a marvel of engineering, giving us unmatched capabilities in wide-format and heavy-duty board.

What Sets Us Apart:

  • 24/7 production
  • Industry-leading uptime
  • Advanced automation and real-time monitoring
  • Precision, consistency, and low waste
  • Order today. Receive your product tomorrow
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Products

Flute Types

At Keystone Sheets, we produce a wide range of flute configurations to serve everything from everyday packaging to the toughest industrial applications. Our single wall options include A, B, C, and E flutes. For added strength, we offer double wall combinations like EB, BC, EC, and CA. For maximum durability, our triple wall CAA configuration delivers unmatched performance. Each flute combination offers unique benefits in strength, protection, and printability—giving converters the flexibility to meet any packaging requirement.

Contact us to learn more!
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Products

Paper Variety

We offer a variety of paper types to suit a wide range of packaging needs. Our recycled containerboard is the go-to choice for most applications, providing reliable performance and sustainability. For packaging that demands a cleaner look or high-end graphics, we also supply white and Kemi liner variations—ideal for retail and display-ready boxes. When maximum strength is required, we offer virgin kraft liners, delivering superior durability and performance for the most demanding uses.

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Products

Fast and Flexible

At Keystone Sheets, we’re built for flexibility—able to handle everything from small custom runs to large-scale orders with speed and precision. Whether you need a handful of sheets for a short-turn project or a truckload for a major production run, we’ve got you covered. Our streamlined processes and dedicated team allow us to deliver high-quality corrugated sheets with unmatched turnaround times—including delivery within 24 hours. No matter the order size, we move fast to keep your business moving forward.

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Capabilities

A Competitive Edge

At Keystone Sheets, we run single-wall, double-wall, and the industry’s most capable triple-wall board—all with fast turnarounds and tight quality control.
Our Corrugator:
• 132” width—the widest in the country
• Triple wall capable
• Built for high-performance, high-yield output
• Supports large-format runs with less trim and waste

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They Call It Cardboard.
We Call It Corrugated.

To the average person, it’s all “cardboard.” But in the packaging world, the difference matters. At Keystone Sheets, we don’t make cereal boxes or thin paperboard folders—we manufacture corrugated sheets and containerboard, engineered for strength, durability, and performance.

What Is Cardboard?

What Is Cardboard?

“Cardboard” is a general term people use for paper-based packaging. Technically, cardboard refers to:

  • Single-layer paperboard
  • Commonly used in consumer goods packaging like tissue boxes, cereal boxes, restaurant take-out and gift boxes
  • Thin, bendable, and not made for structural strength

In short, cardboard is not designed to carry weight—and that’s exactly why corrugated was invented.

What Is Corrugated?

Corrugated material, also known as containerboard, is what most shipping boxes are actually made from. It’s engineered using multiple layers of paper:

  • Two flat outer layers called liners
  • A middle fluted layer that creates rigid strength
  • Can be made in single-wall, double-wall, or triple-wall formats

Corrugated sheets offer:

  • Superior crush resistance
  • Stacking strength
  • Load-bearing capability
  • Customization for size, weight, and durability

Why It Matters

If you’re shipping heavy products, industrial equipment, or anything that needs real protection, cardboard won’t cut it. You need corrugated—and preferably from a supplier that understands the difference.

Keystone Sheets produces high-quality corrugated sheets, including 132” triple-wall board, one of the strongest and widest formats available in the U.S. Our sheets are used to make boxes and packaging that protect millions of pounds of goods every year.

Built for More Than Just Boxes

Our corrugated sheets are used in:

  • Industrial and bulk shipping
  • Export packaging
  • Custom and oversized packaging
  • High-strength e-commerce boxes

So yes—people may search for “cardboard,” but at Keystone Sheets, we deliver something far stronger: high-performance corrugated sheets that keep your products safe, secure, and moving.