Article · Wikipedia archive · Last revised Jun 17, 2026

Solid unbleached board

Solid unbleached board, also known as SUB, is a grade of paperboard typically made of unbleached chemical pulp. Most often it comes with two to three layers of mineral or synthetic pigment coating on the top and one layer on the reverse side. Recycled fibres are sometimes used to replace the unbleached chemical pulp.

Last revised
Jun 17, 2026
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≈ 1 min
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Wikipedia ↗
SUB construction:
1 – Coating
2 – Solid Unbleached Board
Not drawn to scale source ↗

Solid unbleached board, also known as SUB, is a grade of paperboard typically made of unbleached chemical pulp. Most often it comes with two to three layers of mineral or synthetic pigment coating on the top and one layer on the reverse side. Recycled fibres are sometimes used to replace the unbleached chemical pulp.1

The main end use for this type of board is for packaging of frozen or chilled food, beverage carriers, detergent,2 cereals, shoes, toys, and others.3

See also

See also

Further reading

Further reading

References

References

  1. Stora Enso (2008), Paperboard Guide
  2. Twede, Diana; Selke, Susan E. M. (2004), Cartons, Crates and Corrugated Board: Handbook of Paper and Wood Packaging Technology, Lancaster, PA: DasTech Publications
  3. Pro Carton (2009). "Types of Cartonboard". Retrieved 2009-09-22.