ISO/TC 6/WG 15 - Pulp Methods

This document specifies an apparatus and the procedures for the laboratory wet disintegration of mechanical pulps that exhibit latency except when brightness is measured. This apparatus and procedure can be used for preparation of the test portion in other International Standards dealing with pulps. This document is applicable to all kind of mechanical pulps (i.e. mechanical, semi-chemical and chemi-mechanical pulps) exhibiting latency.

This document specifies the general procedure for fibre furnish analysis of paper, board and pulps. It is applicable to all kinds of pulps and to most papers and boards, including those containing more than one kind of fibre, taking into account different pulping processes. This method is less suitable for heavily impregnated or highly coloured papers and boards, which cannot be dispersed or decoloured without affecting the structure or the staining reactions of the fibres.

This document specifies two procedures for the preparation of laboratory sheets prior to measuring optical properties. One is the preparation of pads in a Büchner funnel using a filter paper or a wire screen and the other one is the preparation of laboratory sheets in a standard sheet former (conventional or Rapid Köthen). This document is applicable to all wood pulps and to most other types of pulp. It is not applicable to pulps with very long fibres, such as those made from unshortened cotton, flax and similar materials, unless they are reduced to a suitable fibre length (about 2 mm) before performing the methods. It is not applicable to recycled pulps (see ISO 21993). It is not applicable to opacity measurements or to the determination of light scattering and absorption coefficients.

This document specifies the relevant International Standards used for the determination of physical properties of laboratory sheets made of all types of pulps. It is applicable to laboratory sheets prepared in accordance with ISO 5269‑1, ISO 5269‑2 or ISO 5269‑3.