What Is Corrugated?

• Corrugated has a ruffly layer, called "fluting," between smooth sheets, called "liner."
  
  
• Many types of corrugated are available, each with different flute sizes and thicknesses.
  
  
• The corrugated paper most commonly used to make boxes has one layer of fluting between two smooth sheets.
  
  
• Corrugated is made primarily from lumber industry byproducts, such as sawdust and wood chips.
  
  
• Nowadays, one of the most frequently used raw materials for making corrugated is old corrugated. So the next time you see a corrugated box, you'll know that it is recyclable, and that some of the fiber in it has probably been recycled once or twice already!