introduction
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ISO 5647-2019 – Determination of titanium dioxide content in paper and board

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Explanations of the relevant standards of voluntary, ISO specific terms related to conformity assessment and the expression of meaning, and the ISO in the technical barriers to trade (TBT) adhere to the principle of the world trade organization (WTO) information, please refer to the iso.org/iso/foreword.html.

This document was prepared by the ISO/TC 6 Technical Committee on Paper, Board and Pulp.

The second edition cancelled and replaced the first edition (ISO 5647:1990), which constituted a minor revision. Changes from the previous edition are as follows:

– Article 4: Added the option to use inductively coupled plasma/Atomic emission spectrometry (ICP/AES).

Any feedback or questions on this document should be referred to the user’s national standards body. A complete list of these institutions can be found at iso.org/members.html.

The methods specified in this document involve the use of certain hazardous chemicals and gases that can form explosive mixtures with air. Care should be taken to ensure compliance with relevant safety precautions.

ISO 5647-2019 – Determination of titanium dioxide content in paper and board

1 Scope of Application
This document specifies a method for determining the content of titanium dioxide in various types of paper and board, especially coated or filled products. It consists of two procedures for the final determination of titanium, one by spectrophotometry and the other by flame atomic absorption spectrometry. The determination limit depends on the sample size (8.1).

Note: This method is designed for the determination of titanium dioxide. Titanium present in other forms, such as as a component of clay, does not interfere with the determination.

2 Normative reference documents
When the following documents are referenced in the text, some or all of them constitute the requirements of this document. For dated references, only the cited version applies. For undated citations, a new version of the referenced document (including any revisions) applies.

ISO 186, paper and board – sampling to determine average quality

ISO 287 Paper and paperboard – Determination of moisture content in batches – drying method

ISO 2144, paper, board, pulp and cellulose nanomaterials – Determination of burn residues (ash content) at 900 °C

ISO 5647-2019 – Determination of titanium dioxide content in paper and board

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

3.1

Titanium dioxide content

The titanium dioxide content of paper or paperboard (expressed on a drying basis) is determined after ashing the sample and dissolving the ash by the method specified in this document

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