The sulphite process generally employs an acid solution and takes its name from the various sulphite chemicals, such as calcium bisulphite (calcium hydrogen sulphite), magnesium bisulphite (magnesium hydrogen sulphite), sodium bisulphite (sodium hydrogen sulphite), ammonium bisulphite (ammonium hydrogen sulphite), which may be used during the preparation of the cooking liquor (see the Explanatory Note to heading 47.02). The solution also contains free sulphur dioxide. The process is used extensively for the treatment of spruce fibre.
Sulphite pulp is used, alone or mixed with other pulps, for various writing or printing papers, etc. It is also used, inter alia, for greaseproof or glazed transparent papers.
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