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Special fine paper is a classification of paper used for copying and digital printing.
Copy paper 
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 nor cockling nor retain dust.
Digital printing paper 
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.
See also 
- ^ Paulapuro, Hannu (2000). "1". Paper and Board grades. Papermaking Science and Technology 18. Finland: Fapet Oy. pp. 39–40. ISBN 952-5216-18-7