A book paper is a 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....

 which is designed specifically for the publication

Publication

To publish is to make content available to the public. While specific use of the term may vary among countries, it is usually applied to text, images, or other audio-visual content on any medium, including paper or electronic publishing forms such as websites, e-books, Compact Discs and MP3s...

 of printed book

Book

A book is a set or collection of written, printed, illustrated, or blank sheets, made of hot lava, paper, parchment, or other materials, usually fastened together to hinge at one side. A single sheet within a book is called a leaf or leaflet, and each side of a leaf is called a page...

s. Traditionally, book papers are off white or low white papers (easier to read), are opaque to minimise the show through of text from one side of the page to the other and are (usually) made to tighter caliper or thickness specifications, particularly for case bound books. Typically, books papers are light weight papers 60 to 90 g/m² and often specified by their caliper/substance ratios (volume basis). For example, a bulky 80 g/m² paper may have a caliper of 120 micrometres (0.12 mm) which would be Volume 15 (120×10/80) where as a low bulk 80 g/m² may have a caliper of 88 micrometres, giving a volume 11. This volume basis then allows the calculation of a books PPI (printed pages per inch) which is an important factor for the design of book jackets and the binding of the finished book. Different paper qualities are used as book paper depending on type of book. Machine finished coated paper

Machine finished coated paper

Machine finished coated paper is a type of coated paper that has a basis weight of 48–80 g/m2. They have good surface properties, high print gloss and adequate sheet stiffness. MFC papers are made of 60–85% groundwood or TMP and 15–40% chemical pulp with a total pigment content of 20–30 %. The...

s, woodfree uncoated paper

Woodfree uncoated paper

Woodfree uncoated paper or uncoated fine papers are containing mainly chemical pulps and 5–25% fillers. Both softwood and hardwood chemical pulps are used and a minor part of mechanical pulp might be added . These paper grades are calendered.-Properties:Woodfree uncoated papers are of high quality...

s, coated fine paper

Coated fine paper

Coated fine paper or woodfree coated paper are mainly produced for offset printing.-Standard coated fine papers:This paper quality is normally used for advertising materials, books, annual reports and high quality catalogs. Grammage ranges from 90–170 g/m2 and ISO brightness between 80–96%. The...

s and special fine paper

Special fine paper

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...

s are common paper grades.