HP 4250n HP LaserJet Printer Family - Print Media Specification Guide - Page 35
Specifications, Common paper grades and basis weights
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A Specifications U.S. paper grades The U.S. paper-grading system has evolved through custom and usage, resulting in similar papers having differently stated weights. For example, a 24-lb bond paper is exactly the same weight as a 60-lb book paper, or a 60-lb text, or a 33-lb cover. This is because basis weight is defined as the weight of 500 sheets of paper cut to basic size. The basic size for bond, book/text, cover, index, bristol, and tag are all different, so the given weights for these paper grades can be different although the physical weight is virtually identical. Common paper grades and basis weights The following table helps clarify differences in weights among paper grades. Note the difference in basic size for each grade, which affects the weight of 500 sheets of that grade. Paper grade Basic size Basic area Factor Bond Text Book (coated or uncoated) Cover Bristol Index Tag Metric weight 17 by 22 inches (432 by 559 mm) 374.0 sq. inches 1.00 (.241 m2) 25 by 38 inches (635 by 965 mm) 950.0 sq. inches 2.54 (.613 m2) 25 by 38 inches (635 by 965 mm) 950.0 sq. inches 2.54 (.613 m2) 20 by 26 inches (508 by 660 mm) 520.0 sq. inches 1.39 (.335 m2) 22.5 by 28.5 inches (571 by 724 mm) 641.25 sq. inches 1.71 (.414 m2) 25.5 by 30.5 inches (648 by 775 mm) 777.75 sq. inches 2.08 (.502 m2) 24 by 36 inches (610 by 910 mm) 864.0 sq. inches 2.31 (.557 m2) 39.37 by 39.37 inches 1550.0 sq. inches 3.76 (1000 by 1000 mm) (1.0 m2) Equivalent basis weights (example) 24-lb bond 61-lb text 61-lb book 33-lb cover 41-lb Bristol 50-lb index 55-lb tag 90 g/m2 A Specifications 29