SBSK is an acronym for Southern bleached softwood kraft. It this is a wood pulp

Wood pulp

Pulp is a lignocellulosic fibrous material prepared by chemically or mechanically separating cellulose fibres from wood, fibre crops or waste paper. Wood pulp is the most common raw material in papermaking.-History:...

 mainly produced in the southern USA. The main raw materials are slash pine

Slash Pine

Pinus elliottii, commonly known as the Slash Pine, is a pine native to the southeastern United States, from southern South Carolina west to southeastern Louisiana, and south to the Florida Keys....

, longleaf pine

Longleaf Pine

Pinus palustris, commonly known as the Longleaf Pine, is a pine native to the southeastern United States, found along the coastal plain from eastern Texas to southeast Virginia extending into northern and central Florida....

, shortleaf pine

Shortleaf Pine

Pinus echinata is a species of pine native to the eastern United States from southern New York south to northern Florida, west to the extreme southeast of Kansas, and southwest to eastern Texas. The tree is variable in form, sometimes straight, sometimes crooked, with an irregular crown...

, loblolly pine

Loblolly Pine

Pinus taeda is one of several pines native to the Southeastern United States, from central Texas east to Florida, and north to Delaware. It is particularly dominant in the eastern half of North Carolina, where there are huge expanses consisting solely of Loblolly Pine trees...

 and virginia pine

Virginia Pine

Pinus virginiana is a medium-sized tree, often found on poorer soils from Long Island in southern New York south through the Appalachian Mountains to western Tennessee and Alabama. The usual size range for this pine is 9–18 m, but can grow taller under optimum conditions. The trunk can be...

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Properties

SBSK is produced from mixed fibre sources, but the main wood species of the pulp is dominating the properties. All are have long fibres. Slash pine and longleaf pine have thick walled fibres and makes the pulp suitable for fluff pulp.

Applications

SBSK is used in in fluff pulp

Fluff pulp

Fluff pulp is a type of chemical pulp made from long fibre softwoods. Important parameters for fluff pulp are bulk and water absorbency.-Manufacture:...

, tissue paper

Tissue paper

Tissue paper is a lightweight paper or, light crêpe paper. Tissue can be made both from virgin and recycled paper pulp.-Properties:Key properties are: strength, absorbency, basis weight, thickness , brightness, stretch, appearance and comfort....

, filter paper

Filter paper

Filter paper is a semi-permeable paper barrier placed perpendicular to a liquid or air flow. It is used to separate fine solids from liquids or air.-Properties:Filter paper comes in various porosities and grades depending on the applications it is meant for...

 and mercerised pulp

Mercerised pulp

Mercerised pulp is a bleached pulp that is treated with hot dilluted alkali to get extra high bulk and high porosity. The pulp feels and looks similar to a cotton ball.-Manufacture:...

. It is used as reinforcement fibres when making paper

Paper

Paper is a thin material mainly used for writing upon, printing upon, drawing or for packaging. It is produced by pressing together moist fibers, typically cellulose pulp derived from wood, rags or grasses, and drying them into flexible sheets....

 or as raw material for kraft paper

Kraft paper

Kraft paper or kraft is paper or paperboard produced from chemical pulp produced in the kraft process.Pulp produced by the kraft process is stronger than that made by other pulping processes; acidic sulfite processes degrade cellulose more, leading to weaker fibers, and mechanical pulping...

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