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– Technical specification tables 43
Technical specification
tables
U.S. paper grades
The U.S. paper grading system has evolved from 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. The tables
in this section help clarify these differences. Note the difference in
basic size for each grade, which affects the weight of 500 sheets of
that grade.