Pulp (sellu, selluloosa)
Pulp is an intermediate product made of wood, and is most commonly used as raw material for paper. The properties of pulp depend on the species of tree and the manufacturing method used. The properties of paper may be modified by modifying the pulp used.
Mechanical, or groundwood pulp is manufactured mechanically, which means that the wood is ground so as to separate the fibres from each other. (In Finnish: hioke, mekaaninen massa.)
Chemical pulp is manufactured through separating the fibres by boiling wood chips and chemicals together. (In Finnish: hioke, mekaaninen massa.)