Special fine paper is a classification of paper used for copying and digital printing.[1]
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Copy paper is used for copying and laser printers. The basis weight is 70-90 g/m² and ISO brightness 80-96%. It is made of 90–100% virgin chemical pulp or 100% deinked pulp with total pigment content of 10-15%. The most important quality is smooth run in a copying machine / printer and good dimensional stability. It must not show curling or cockling and retain dust.
Digital printing paper is also called electronic printing paper. The basis weight is 40-400 g/m². This paper quality can be both coated and uncoated. The demands of the paper can vary a lot depending on printing method: electrical charge, thermal, magnetic and ink-jet. All require good dimensional stability, no curling nor cockling, good surface strength and surface smoothness. For ink-jet paper it is also important with sufficient and even porosity to counteract spreading of the ink.