Corrugated fiberboard is made primarily from cellulose fiber, which comes from the trees. However, trees are not the only source of wood fibers in paper. Approximately half of the wood fiber used to make paper comes from the following recycled sources:
• The lumber industry’s byproducts, including sawdust and small chips. Once burned as waste, the paper industry now uses these byproducts to provide about one-third of the wood fibers used to make paper.
• Recycled paper, which now also provides about one-third of the rawmaterial for the paper industry.
Source: Fiber Box Handbook, Fiber Box Association, 2005