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ISO 534 Caliper




ISO 534


Determination of thickness, density and specific volume


ISO 534 Caliper specifies two methods for measuring the thickness of paper and board:

a) the measurement of a single sheet of paper or board as a single sheet thickness;
b) the measurement of a pack of sheets of paper as a bulking thickness.

This International Standard also specifies calculation methods

– for the apparent sheet density and for the apparent bulk density, and
– for the apparent specific sheet volume and for the apparent specific bulk volume

from the thickness determinations.

This International Standard is not applicable to corrugated fibreboard. In addition, the measurement of bulking thickness, method b) above, is not suitable for board. This standard method is not suitable for use on tissue or compressible substrates.


Measurement of the single sheet thickness or of the bulking thickness, according to the test requirements, by means of a precision micrometer.

Calculation of the apparent sheet density or apparent bulk density of the paper or board, from a knowledge of its grammage and thickness.

Calculation of the apparent specific sheet volume or apparent specific bulk volume of the paper or board, from a knowledge of its grammage and thickness


This method includes calculations for Apparent Sheet Density and Apparent Specific Sheet Volume. The basis weight of the sample is required for calculations.


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