This International Standard 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. It 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, method a) is not suitable for materials with a grammage higher than 225 g/m2.
NOTE 1 The two methods generally lead to different results.
NOTE 2 For tissue paper and tissue products, ISO 12625-3 should be used.
ISO 534:2005 history
2011ISO 534:2011 Paper and board - Determination of thickness, density and specific volume
2005ISO 534:2005 Paper and board - Determination of thickness, density and specific volume
1988ISO 534:1988 Paper and board; determination of thickness and apparent bulk density or apparent sheet density
1980ISO 534:1980 Paper and board — Determination of the thickness of single sheets (and method of calculation of the apparent density of board)