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REGAL 5790 MATERIALS USAGE GUIDE
Paper Weight
gsm
Paper weight is generally expressed as grams per square meter
(gsm), a measure that makes it easy to compare any two pieces of
paper, even if the papers are of different types.
Basis weight
Paper weight is also expressed in terms of
basis weight
, which is the
weight of 500 sheets of paper of a particular size. Because each
type of paper (bond, offset, cover, index, etc.) is expressed in terms
of a different basis size, a 20 lb bond paper and a 20 lb offset paper
are not the same weight in gsm.
M value
The weight of some materials is described by the M value printed on
the package (i.e. 21.64M). The M value is the weight in lbs of 1,000
sheets of the size of the paper in the package. To convert the M
value to gsm for 8.5 x 11” paper, multiply the M value by 7.527. To
convert the M value to gsm for 11 x 17” paper, multiply the M value
by 3.763.
Pt. value
Pt (point) value refers to the sheet thickness in mils (thousandths of
an inch). For example, 10 pt. = 0.010”, or 7 pt. = 0.007” thick paper.
You cannot directly convert pt value to paper weight or stiffness.
For most paper types, the maximum recommended paper weight of
163 gsm will be equivalent to 7 pt or 8 pt paper.
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