Solid Unbleached Sulfate

SUS stands for Solid Unbleached Sulfate. Some manufacturers call it Coated Natural Kraft® – CNK® (Westrock) or Coated Unbleached Kraft -CUK (Graphic Packaging).


The 100% virgin fiber is unbleached but the board comes with a thick coating on one side for an outstanding color rendering.

Its natural resistance to moisture make it an ideal candidate for refrigerated and frozen applications.

SUS can also come with a wet-strength grade which make it the ideal substrate for beverage carrier cartons.

Available calipers range from 14 pts to 30 pts (290 gsm to 560 gsm).

Do not hesitate to contact-us so we can develop you sourcing strategy together.

SUS - Solid unbleached Sulfate - Fibres vierges non blanchie

Six pack of brown beer bottles in SUS (Solid Unbleached Sulfate)