This International Standard specifies two methods of measur-ing the thicknes of paper and board and of calculating the ap-parent bulk density or the apparent sheet density from the thickness determinations. The methods are
a) measurement of single sheets of paper or board (single sheet thickness);
b) measurement of a pack of sheets of paper of grammage up to 224 g/m2 (bulking thickness).
Method b) is applicable to corrugated fibreboard. Neither method is applicable to certain soft papers such as tissues which are creped and/or embossed due to the slow or excessive compression which takes place when measurements are made on such materials.
AS/NZS 1301.426s:1994 history
2015AS/NZS 1301.426S:2015 Methods of test for pulp and paper, Method 426S: Paper and board — Determination of thickness, density and specific volume
1994AS/NZS 1301.426s:1994 Methods of test for pulp and paper - Determination of thickness and apparent bulk density or apparent sheet density