ASTM D 646 Standard Test Method for Grammage of Paper and Paperboard (Mass per Unit Area)
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ASTM D 646 Document Information:
Title
Standard Test Method for Grammage of Paper and Paperboard (Mass per Unit Area)
ASTM International
Publication Date:
Jan 10, 1996
Scope:
This test method covers the determination of the grammage of
paper and paperboard (mass per unit area). In English-speaking
countries the customary or commercial practice of expressing the
"weight" per unit area (more properly "mass per unit area") of
paper has been "basis weight," "ream weight," or "substance,"
defined as the mass in pounds of a ream of a given sheet size and
number of sheets (usually 500 sheets, occasionally 480 sheets). In
most other countries and increasingly in English-speaking
countries, the mass per unit area is expressed in grams per square
metre. The French term for mass per unit area," grammage," is
recommended by ISO Committee TC 6 on Paper for use in English as
well as in French because of its convenience and clear relationship
to grams per square metre.
The mass per unit area of paperboard has been expressed in the
customary system as the mass in pounds per thousand square feet,
and in the metric system as grams per square metre.
The SI metric units, in which grammage (mass per unit area) is
expressed in grams per square metre (g/m2), are the
preferred units for ASTM test methods for paper and paperboard.
This standard does not purport to address all of the safety
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.
Keywords:
- basis weight
- grammage
- mass per unit area
- paperboard
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