EN ISO 638-1:2022

• Abstract:

  This document specifies an oven-drying method for the determination of the dry matter content in paper, board, pulp and cellulosic nanomaterials in solid form, which all can be produced from virgin and /or recycled materials.; It is also applicable to the determination of the dry matter content of paper and board for recycling.; The procedure is applicable to paper, board, and pulp and cellulosic nanomaterials which do not contain any appreciable quantities of materials other than water that are volatile at the temperature of 105 °C ± 2 °C. It is used, for example, in the case of pulp, paper, and board and cellulosic nanomaterial samples taken for chemical and physical tests in the laboratory, when a concurrent determination of dry matter content is required.; This method is not applicable to the determination of the dry matter content of slush pulp or to the determination of the saleable mass of pulp lots.; NOTE 1 ISO 638-2[1] specifies an oven-drying method for the determination of the dry matter content of suspensions of cellulosic nanomaterials, ISO 287[2] specifies the determination of the moisture content of a lot of paper and board; ISO 4119[3] specifies the determination of stock concentration of pulps; the ISO 801 series[4] specifies the determination of the saleable mass in lots.; NOTE 2 This document determines the total dry matter content of the sample, including any dissolved solids. If only the cellulosic material content free of dissolved solids is desired, dissolved solids are removed prior to measuring the dry matter content, e.g. by washing or dialysis, taking care to retain all cellulosic material; in cases where the sample is filterable without loss of cellulosic solids, ISO 4119[3] can be used to determine the stock consistency (content of cellulosic material in solid form).

• Status: Published
• Publication Date: 05-Apr-2022
• Withdrawal Date: 30-Oct-2022
• ICS: 85.040 - Pulps
• ICS: 85.060 - Paper and board
• Technical Committee: CEN/TC 172 - Pulp, paper and board
• Drafting Committee: CEN/TC 172 - Pulp, paper and board
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 06-Apr-2022
• Completion Date: 06-Apr-2022
• Ref Project: SIST EN ISO 638-1:2022 - Paper, board, pulps and cellulosic nanomaterials - Determination of dry matter content by oven-drying method - Part 1: Materials in solid form (ISO 638-1:2022)

• Replaces: EN ISO 638-1:2021 - Paper, board, pulps and cellulosic nanomaterials - Determination of dry matter content by oven-drying method - Part 1: Materials in solid form (ISO 638-1:2021)
• Effective Date: 01-Sep-2021
• Refers: ISO 186:2002 - Paper and board — Sampling to determine average quality
• Effective Date: 25-Aug-2026
• Refers: ISO 7213:2021 - Pulps — Sampling for testing
• Effective Date: 09-Feb-2026
• Refers: EN 17085:2019 - Paper and board - Sampling procedures for paper and board for recycling
• Effective Date: 28-Jan-2026
• Refers: EN 4800-002:2010 - Aerospace series - Titanium and titanium alloys - Technical specification - Part 002: Bar and section
• Effective Date: 28-Jan-2026
• Referred By: CEN/TS 17630:2021 - Pulp, paper and paperboard - Determination of anthraquinone in extracts from pulp, paper and paperboard
• Effective Date: 28-Jan-2026
• Referred By: CEN/TS 17497:2020 - Pulp, paper and paperboard - Determination of bisphenol A in extracts from paper and paperboard
• Effective Date: 28-Jan-2026
• Referred By: EN 16453:2014 - Pulp, paper and paperboard - Determination of phthalates in extracts from paper and paperboard
• Effective Date: 28-Jan-2026
• Consolidated By: ISO 638-1:2022 - Paper, board, pulps and cellulosic nanomaterials — Determination of dry matter content by oven-drying method — Part 1: Materials in solid form
• Effective Date: 12-Feb-2026

Overview

EN ISO 638-1:2022 - "Paper, board, pulps and cellulosic nanomaterials - Determination of dry matter content by oven-drying method - Part 1: Materials in solid form" - specifies an oven-drying procedure to determine the dry matter content (and by complement, moisture content) of paper, board, pulp and cellulosic nanomaterials in solid form. The method uses an oven temperature of 105 °C ± 2 °C and is intended for materials that do not contain appreciable quantities of non‑water volatiles at that temperature. It is widely used when dry mass is needed to express chemical or physical test results on a dry basis.

Key topics and requirements

• Scope: Applies to solid-form paper, board, pulp and cellulosic nanomaterials (virgin and/or recycled). Not applicable to slush pulp or to determining saleable mass of pulp lots.
• Oven-drying principle: Drying to a constant mass at 105 °C ± 2 °C; calculation of dry matter content as the ratio of oven-dry mass to original mass.
• Total dry matter: Results include dissolved solids present in the sample. If only cellulosic solids are required, dissolved solids must be removed (e.g., washing or dialysis) prior to drying.
• Sampling and preparation: References established sampling standards (ISO 186, ISO 7213, EN 17085) and gives guidance on preparing representative test pieces.
• Precision and reporting: Precision data and guidance are provided (see Clause 10 and informative Annex B). Test report requirements and calculation examples are included.
• Limitations: Do not use where significant volatile non-water components exist at the test temperature.

Practical applications and users

Who uses EN ISO 638-1:2022:

• Quality control laboratories in paper mills and converting plants checking moisture and dry matter.
• Analytical and environmental labs needing dry‑basis results for chemical analyses (e.g., metals or additives).
• R&D teams working with cellulosic nanomaterials (CNMs) and pulp formulations.
• Recycling operations assessing dry matter of paper and board for recycling streams.

Why it’s used:

• To convert measured concentrations to an oven-dry basis.
• To control manufacturing processes influenced by moisture (e.g., printing stability, curl).
• To ensure reproducible moisture/dry-matter data for regulatory or contractual purposes.

Related standards

• ISO 638-2 - oven-drying for suspensions of cellulosic nanomaterials
• ISO 287 - moisture content of paper and board lots
• ISO 4119 - stock concentration of pulps
• ISO 186, ISO 7213, EN 17085 - sampling procedures referenced by EN ISO 638-1:2022

Keywords: EN ISO 638-1:2022, dry matter content, oven-drying method, paper board pulp, cellulosic nanomaterials, moisture content, 105 °C.

SLOVENSKI STANDARD
01-junij-2022
Nadomešča:
SIST EN ISO 638-1:2021
Papir, karton, lepenka in vlaknine ter celulozni nanomateriali - Določevanje suhe
snovi z metodo sušenja v sušilniku - 1. del: Materiali v trdni obliki (ISO 638-1:2022)
Paper, board, pulps and cellulosic nanomaterials - Determination of dry matter content
by oven-drying method - Part 1: Materials in solid form (ISO 638-1:2022)
Papier, Pappe, Faserstoff und cellulosehaltige Nanomaterialien - Bestimmung des
Trockengehaltes durch das Wärmeschrankverfahren - Teil 1: Materialien in fester Form
(ISO 638-1:2022)
Papiers, cartons, pâtes et nanomatériaux cellulosiques - Détermination de la teneur en
matières sèches par séchage à l'étuve - Partie 1: Matériaux sous forme solide (ISO 638-
1:2022)
Ta slovenski standard je istoveten z: EN ISO 638-1:2022
ICS:
85.040 Vlaknine Pulps
85.060 Papir, karton in lepenka Paper and board
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 638-1
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2022
EUROPÄISCHE NORM
ICS 85.040; 85.060 Supersedes EN ISO 638-1:2021
English Version
Paper, board, pulps and cellulosic nanomaterials -
Determination of dry matter content by oven-drying
method - Part 1: Materials in solid form (ISO 638-1:2022)
Papiers, cartons, pâtes et nanomatériaux cellulosiques Papier, Pappe, Faserstoff und cellulosehaltige
- Détermination de la teneur en matières sèches par Nanomaterialien - Bestimmung des Trockengehaltes
séchage à l'étuve - Partie 1: Matériaux sous forme durch das Wärmeschrankverfahren - Teil 1:
solide (ISO 638-1:2022) Materialien in fester Form (ISO 638-1:2022)
This European Standard was approved by CEN on 14 March 2022.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 638-1:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 638-1:2022) has been prepared by Technical Committee ISO/TC 6 "Paper,
board and pulps" in collaboration with Technical Committee CEN/TC 172 “Pulp, paper and board” the
secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by October 2022, and conflicting national standards shall
be withdrawn at the latest by October 2022.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 638-1:2021.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 638-1:2022 has been approved by CEN as EN ISO 638-1:2022 without any modification.

INTERNATIONAL ISO
STANDARD 638-1
Second edition
2022-03
Paper, board, pulps and cellulosic
nanomaterials — Determination of
dry matter content by oven-drying
method —
Part 1:
Materials in solid form
Papiers, cartons, pâtes et nanomatériaux cellulosiques —
Détermination de la teneur en matières sèches par séchage à
l'étuve —
Partie 1: Matériaux sous forme solide
Reference number
ISO 638-1:2022(E)
ISO 638-1:2022(E)
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 638-1:2022(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 3
5 Apparatus . 3
6 Sampling . 3
7 Preparation of test pieces .3
7.1 General . 3
7.2 Paper and board for recycling . 3
7.3 Paper, board, pulp and cellulosic nanomaterial in solid form . 3
8 Procedure .4
9 Calculation and expression of results . 5
10 Precision . 5
11 Test report . 5
Annex A (informative) Calculation of the moisture content . 6
Annex B (informative) Precision . 7
Bibliography .10
iii
ISO 638-1:2022(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 6, Paper, board and pulps, in collaboration
with the European Committee for Standardization (CEN) Technical Committee CEN/TC 172, Pulp, paper
and board, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna
Agreement).
This second edition cancels and replaces the first edition (ISO 638-1:2021), of which it constitutes a
minor revision. The changes are as follows:
— correction of the cross-references in Clause 8;
— editorial update.
A list of all parts in the ISO 638 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
ISO 638-1:2022(E)
Introduction
Determination of dry matter content and moisture content are carried out for different purposes.
This document is used when the dry matter content is needed to calculate the results for chemical
analysis or physical testing, or to determine the moisture content of paper, board, and pulp and
cellulosic nanomaterials in solid form. An example of this is where the results of a chemical analysis for
cadmium or manganese are required on the basis of the oven-dry mass of the sample.
[1]
ISO 638-2 is dedicated to the determination of the dry matter content or water content of cellulosic
nanomaterials in the form of suspensions.
[2]
ISO 287 should be used for the purpose of determining the average moisture content and the variation
in moisture content (maximum and minimum values) of a lot of paper and board. In the converting of
paper and board, moisture content is important as it can have an effect on processes such as printing
and copying. Moisture content can have an effect on curl and dimensional stability.
[3]
ISO 4119 should be used in laboratory procedures or is referred to in other International Standards
in which the concentration of an aqueous pulp suspension requires determination.
v
INTERNATIONAL STANDARD ISO 638-1:2022(E)
Paper, board, pulps and cellulosic nanomaterials —
Determination of dry matter content by oven-drying
method —
Part 1:
Materials in solid form
1 Scope
This document specifies an oven-drying method for the determination of the dry matter content in
paper, board, pulp and cellulosic nanomaterials in solid form, which all can be produced from virgin
and /or recycled materials.
It is also applicable to the determination of the dry matter content of paper and board for recycling.
The procedure is applicable to paper, board, and pulp and cellulosic nanomaterials which do not
contain any appreciable quantities of materials other than water that are volatile at the temperature of
105 °C ± 2 °C. It is used, for example, in the case of pulp, paper, and board and cellulosic nanomaterial
samples taken for chemical and physical tests in the laboratory, when a concurrent determination of
dry matter content is required.
This method is not applicable to the determination of the dry matter content of slush pulp or to the
determination of the saleable mass of pulp lots.
[1]
NOTE 1 ISO 638-2 specifies an oven-drying method for the determination of the dry matter content of
[2]
suspensions of cellulosic nanomaterials, ISO 287 specifies the determination of the moisture content of a lot
[3] [4]
of paper and board; ISO 4119 specifies the determination of stock concentration of pulps; the ISO 801 series
specifies the determination of the saleable mass in lots.
NOTE 2 This document determines the total dry matter content of the sample, including any dissolved solids.
If only the cellulosic material content free of dissolved solids is desired, dissolved solids are removed prior to
measuring the dry matter content, e.g. by washing or dialysis, taking care to retain all cellulosic material; in
[3]
cases where the sample is filterable without loss of cellulosic solids, ISO 4119 can be used to determine the
stock consistency (content of cellulosic material in solid form).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 186, Paper and board — Sampling to determine average quality
ISO 7213, Pulps — Sampling for testing
EN 17085, Paper and board – Sampling procedures for paper and board for recycling
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
...