Standard Practice for
Units of Measurement and Conversion Factors for Pulp,
Paper, and Paperboard1
This standard is issued under the fixed designation D 4826; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This practice covers the application of the International
System of Units (abbreviated SI) within the field of pulp,
paper, and paperboard. The SI units have been adopted by ISO,
ASTM, and TAPPI as the preferred units for use in their
standards and test methods.
1.2 Details of SI are given in various parts of ISO Standards 31 and 1000, and in ASTM Standard E 380. Application
of this information is not always easy, as some properties
cannot at this time be expressed in SI, some can be expressed
in various units, all within SI, and various multiples can be
used. Such variation can lead to confusion in reporting test
results and in quoting values for properties.
1.3 In order to overcome such problems within the pulp,
paper, and paperboard field, ISO/TC6 has recommended appropriate units in ISO Standard 5651. These recommendations
are reproduced in this practice, together with other information
and recommendations.
2. Referenced Documents2
2.1 ASTM Standards:
IEEE/ASTM SI 10 American National Standard for Use of
the International System of Units (SI): The Modern Metric
System3,4
2.2 ISO Standards:
ISO 31 Quantities, Units, and Symbols, Parts 0–134
ISO 1000 SI Units and Recommendations for the Use of
Their Multiples and of Certain Other Units4
3. Summary of Practice
3.1 This practice covers the units recommended for use in
expressing the properties of pulp, paper, and paperboard and
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