SIST EN ISO 638-2:2022

Paper, board, pulps and cellulosic nanomaterials - Determination of dry matter content by oven-drying method - Part 2: Suspensions of cellulosic nanomaterials (ISO 638-2:2022)

This document specifies an oven-drying method for the determination of the dry matter content
in suspensions of cellulosic nanomaterials. The procedure is applicable to cellulosic nanomaterial
suspensions 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 cellulosic nanomaterial
suspensions samples taken for chemical and physical tests in the laboratory, when a concurrent
determination of dry matter content is required.
NOTE 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.

Papier, Pappe, Faserstoff und cellulosehaltige Nanomaterialien - Bestimmung des Trockengehaltes durch das Wärmeschrankverfahren - Teil 2: Suspensionen von cellulosehaltigen Nanomaterialien (ISO 638-2:2022)

Dieses Dokument legt ein Wärmeschrankverfahren für die Bestimmung des Trockengehaltes in Suspensionen von cellulosehaltigen Nanomaterialien fest. Das Verfahren ist anzuwenden für Suspensionen von cellulosehaltigen Nanomaterialien, die außer Wasser keine nennenswerten Mengen von Materialien enthalten, die bei einer Temperatur von 105 °C ± 2 °C flüchtig sind. Es wird z. B. im Fall von Durchschnittsproben aus Suspensionen von cellulosehaltigen Nanomaterialien verwendet, die für chemische und physikalische Prüfungen im Laboratorium entnommen werden, wenn eine gleichzeitige Bestimmung des Trockengehaltes erforderlich ist.
ANMERKUNG 1  ISO 638 1 [1] legt den Trockengehalt von Papier, Pappe, Faserstoff und cellulosehaltigen Nanomaterialien in fester Form fest, die jeweils aus Neumaterial und/oder recyceltem Material hergestellt werden können. ISO 287 [2] legt die Bestimmung des Feuchtegehaltes in einem Lieferposten Papier oder Pappe fest. ISO 4119 [3] legt die Bestimmung der Stoffdichte wässriger Faserstoff Suspensionen fest. ISO 801 (alle Teile) [4] legt die Bestimmung der verkaufsfähigen Masse in Lieferposten fest.
ANMERKUNG 2  Dieses Dokument dient der Bestimmung des Gesamttrockengehaltes der Durchschnittsprobe einschließlich jeglicher gelöster Feststoffe. Wird nur der Gehalt an cellulosehaltigem Material ohne die gelösten Feststoffe gewünscht, werden gelöste Feststoffe vor der Messung des Trockengehaltes z. B. durch Waschen oder Dialyse entfernt, wobei darauf zu achten ist, dass das gesamte cellulosehaltige Material erhalten bleibt.

Papiers, cartons, pâtes et nanomatériaux cellulosiques - Détermination de la teneur en matières sèches par séchage à l'étuve - Partie 2: Suspensions de nanomatériaux cellulosiques (ISO 638-2:2022)

Le présent document spécifie une méthode par séchage à l'étuve pour la détermination de la teneur en matières sèches dans des suspensions de nanomatériaux cellulosiques. La méthode est applicable aux suspensions de nanomatériaux cellulosiques ne contenant pas des quantités appréciables de matières autres que l'eau, volatiles à la température de 105 °C ± 2 °C. Elle est utilisée, par exemple, dans le cas d'échantillons de suspensions de nanomatériaux cellulosiques prélevés en vue d'analyses chimiques et d’essais physiques effectués en laboratoire lorsqu'il faut procéder à la détermination simultanée de la teneur en matières sèches.
NOTE      Le présent document détermine la teneur totale en matières sèches d’un échantillon, y compris tout solide dissous. Pour obtenir la teneur en matériaux cellulosiques sans solides dissous, ces derniers sont éliminés avant de mesurer la teneur en matières sèches, par exemple par lavage ou dialyse, en prenant soin de conserver l'ensemble des matériaux cellulosiques.

Papir, karton, lepenka in vlaknine ter celulozni nanomateriali - Določevanje suhe snovi z metodo sušenja v sušilniku - 2. del: Suspenzije celuloznih nanomaterialov (ISO 638-2:2022)

Ta dokument določa metodo sušenja v sušilniku za določevanje vsebnosti suhe snovi v suspenziji celuloznih nanomaterialov. Postopek se uporablja za suspenzije celuloznih nanomaterialov, ki ne vsebujejo nobenih znatnih količin materialov (razen vode) in ki so hlapni pri temperaturi 105 °C ± 2 °C. Uporablja se na primer pri vzorcih suspenzij celuloznih nanomaterialov,
odvzetih za kemične in fizikalne preskuse v laboratoriju, kadar je potrebno sočasno določanje vsebnosti suhe snovi.
OPOMBA: Ta dokument določa celotno vsebnost suhe snovi v vzorcu, vključno z vsemi raztopljenimi trdnimi snovmi.
Če je zaželena samo vsebnost celuloznega materiala brez raztopljenih trdnih snovi, se raztopljene trdne snovi odstranijo pred merjenjem vsebnosti suhe snovi, npr. s pranjem ali dializo, pri čemer je treba paziti, da se zadrži ves celulozni material.

General Information

• Status: Published
• Public Enquiry End Date: 13-Jan-2022
• Publication Date: 12-May-2022
• ICS: 85.040 - Pulps
• ICS: 85.060 - Paper and board
• Technical Committee: VPK - Pulp, paper, board and products
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 04-May-2022
• Due Date: 09-Jul-2022
• Completion Date: 13-May-2022
• Ref Project: EN ISO 638-2:2022 - Paper, board, pulps and cellulosic nanomaterials - Determination of dry matter content by oven-drying method - Part 2: Suspensions of cellulosic nanomaterials (ISO 638-2:2022)

Relations

• Replaces: SIST EN ISO 638-2:2021 - Paper, board, pulps and cellulosic nanomaterials - Determination of dry matter content by oven-drying method - Part 2: Suspensions of cellulosic nanomaterials (ISO 638-2:2021)
• Effective Date: 01-Jun-2022
• Replaces: SIST EN ISO 638-2:2021 - Paper, board, pulps and cellulosic nanomaterials - Determination of dry matter content by oven-drying method - Part 2: Suspensions of cellulosic nanomaterials (ISO 638-2:2021)
• Effective Date: 08-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 638-2:2022
01-junij-2022
Nadomešča:
SIST EN ISO 638-2:2021
Papir, karton, lepenka in vlaknine ter celulozni nanomateriali - Določevanje suhe
snovi z metodo sušenja v sušilniku - 2. del: Suspenzije celuloznih nanomaterialov
(ISO 638-2:2022)
Paper, board, pulps and cellulosic nanomaterials - Determination of dry matter content
by oven-drying method - Part 2: Suspensions of cellulosic nanomaterials (ISO 638-
2:2022)
Papier, Pappe, Faserstoff und cellulosehaltige Nanomaterialien - Bestimmung des
Trockengehaltes durch das Wärmeschrankverfahren - Teil 2: Suspensionen von
cellulosehaltigen Nanomaterialien (ISO 638-2:2022)
Papiers, cartons, pâtes et nanomatériaux cellulosiques - Détermination de la teneur en
matières sèches par séchage à l'étuve - Partie 2: Suspensions de nanomatériaux
cellulosiques (ISO 638-2:2022)
Ta slovenski standard je istoveten z: EN ISO 638-2:2022
ICS:
85.040 Vlaknine Pulps
85.060 Papir, karton in lepenka Paper and board
SIST EN ISO 638-2:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 638-2:2022

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SIST EN ISO 638-2:2022


EN ISO 638-2
EUROPEAN STANDARD

NORME EUROPÉENNE

March 2022
EUROPÄISCHE NORM
ICS 85.040; 85.060 Supersedes EN ISO 638-2:2021
English Version

Paper, board, pulps and cellulosic nanomaterials -
Determination of dry matter content by oven-drying
method - Part 2: Suspensions of cellulosic nanomaterials
(ISO 638-2:2022)
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 2: Suspensions de durch das Wärmeschrankverfahren - Teil 2:
nanomatériaux cellulosiques (ISO 638-2:2022) Suspensionen von cellulosehaltigen Nanomaterialien
(ISO 638-2:2022)
This European Standard was approved by CEN on 18 February 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 638-2:2022 E
worldwide for CEN national Members.

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SIST EN ISO 638-2:2022
EN ISO 638-2:2022 (E)
Contents Page
European foreword . 3

2

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SIST EN ISO 638-2:2022
EN ISO 638-2:2022 (E)
European foreword
This document (EN ISO 638-2:2022) 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 September 2022, and conflicting national standards
shall be withdrawn at the latest by September 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 638-2:2021.
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 638-2:2022 has been approved by CEN as EN ISO 638-2:2022 without any modification.

3

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SIST EN ISO 638-2:2022

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SIST EN ISO 638-2:2022
INTERNATIONAL ISO
STANDARD 638-2
Second edition
2022-03
Paper, board, pulps and cellulosic
nanomaterials — Determination of
dry matter content by oven-drying
method —
Part 2:
Suspensions of cellulosic
nanomaterials
Papiers, cartons, pâtes et nanomatériaux cellulosiques —
Détermination de la teneur en matières sèches par séchage à
l'étuve —
Partie 2: Suspensions de nanomatériaux cellulosiques
Reference number
ISO 638-2:2022(E)
© ISO 2022

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SIST EN ISO 638-2:2022
ISO 638-2:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© 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 2022 – All rights reserved

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SIST EN ISO 638-2:2022
ISO 638-2:2022(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
6 Sampling . 3
7 Preparation of test specimens . 3
8 Procedure .3
9 Calculation and expression of results . 5
10 Precision . 5
11 Test report . 5
Annex A (informative) Calculation of the water content . 6
Annex B (informative) Precision . 7
Bibliography . 9
iii
© ISO 2022 – All rights reserved

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SIST EN ISO 638-2:2022
ISO 638-2:2022(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 638-2:2021), of which it constitutes a
minor revision. The changes are as follows:
— editorial update;
— addition of a note in Table B.2.
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 2022 – All rights reserved

---------------------- Page: 10 ----------------------
SIST EN ISO 638-2:2022
ISO 638-2:2022(E)
Introduction
Determination of dry matter content and water 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 water content of cellulosic nanomaterial suspensions.
[1]
ISO 638-1 is dedicated to the determination of the dry matter content or moisture content in paper,
board, pulp and cellulosic nanomaterials in solid form, which all can be produced from virgin and/or
recycled materials.
[2]
ISO 287 is 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 is used in laboratory procedures or is referred to in other International Standards in which
the stock concentration of an aqueous pulp suspension requires determination.
[4]
ISO 801 (all parts) specifies the determination of saleable mass in lots.
v
© ISO 2022 – All rights reserved

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SIST EN ISO 638-2:2022

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SIST EN ISO 638-2:2022
INTERNATIONAL STANDARD ISO 638-2:2022(E)
Paper, board, pulps and cellulosic nanomaterials —
Determination of dry matter content by oven-drying
method —
Part 2:
Suspensions of cellulosic nanomaterials
1 Scope
This document specifies an oven-drying method for the determination of the dry matter content
in suspensions of cellulosic nanomaterials. The procedure is applicable to cellulosic nanomaterial
suspensions 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 cellulosic nanomaterial
suspensions samples taken for chemical and physical tests in the laboratory, when a concurrent
determination of dry matter content is required.
NOTE 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.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
cellulosic nanomaterial
CNM
material composed predominantly of cellulose, with any external dimension in the nanoscale (3.5), or a
material having internal structure or surface structure in the nanoscale, with the internal structure or
surface structure composed predominantly of cellulose
Note 1 to entry: The terms nanocellulose (NC) and cellulose nanomaterial (CNM) are alternative terms for
cellulosic nanomaterial (CNM).
Note 2 to entry: Some cellulosic nanomaterials can be composed of chemically modifi
...

SLOVENSKI STANDARD
oSIST prEN ISO 638-2:2022
01-januar-2022
Papir, karton, lepenka in vlaknine ter celulozni nanomateriali - Določevanje suhe
snovi z metodo sušenja v sušilniku - 2. del: Suspenzije celuloznih nanomaterialov
(ISO/FDIS 638-2:2021)
Paper, board, pulps and cellulosic nanomaterials - Determination of dry matter content
by oven-drying method - Part 2: Suspensions of cellulosic nanomaterials (ISO/FDIS 638-
2:2021)
Papier, Pappe, Faserstoff und cellulosehaltige Nanomaterialien - Bestimmung des
Trockengehaltes durch das Wärmeschrankverfahren - Teil 2: Suspensionen von
cellulosehaltigen Nanomaterialien (ISO/FDIS 638-2:2021)
Papiers, cartons, pâtes et nanomatériaux cellulosiques - Détermination de la teneur en
matières sèches par séchage à l'étuve - Partie 2: Suspensions de nanomatériaux
cellulosiques (ISO/FDIS 638-2:2021)
Ta slovenski standard je istoveten z: prEN ISO 638-2 rev
ICS:
85.040 Vlaknine Pulps
85.060 Papir, karton in lepenka Paper and board
oSIST prEN ISO 638-2:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN ISO 638-2:2022

---------------------- Page: 2 ----------------------
oSIST prEN ISO 638-2:2022
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 638-2
ISO/TC 6
Paper, board, pulps and cellulosic
Secretariat: SCC
nanomaterials — Determination of
Voting begins on:
2021-10-25 dry matter content by oven-drying
method —
Voting terminates on:
2022-01-17
Part 2:
Suspensions of cellulosic
nanomaterials
Papiers, cartons, pâtes et nanomatériaux cellulosiques —
Détermination de la teneur en matières sèches par séchage à
l'étuve —
Partie 2: Suspensions de nanomatériaux cellulosiques
ISO/CEN PARALLEL PROCESSING
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 638-2:2021(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2021

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oSIST prEN ISO 638-2:2022
ISO/FDIS 638-2:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
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 2021 – All rights reserved

---------------------- Page: 4 ----------------------
oSIST prEN ISO 638-2:2022
ISO/FDIS 638-2:2021(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
6 Sampling . 3
7 Preparation of test specimens . 3
8 Procedure .3
9 Calculation and expression of results . 5
10 Precision . 5
11 Test report . 5
Annex A (informative) Calculation of the water content . 6
Annex B (informative) Precision . 7
Bibliography . 9
iii
© ISO 2021 – All rights reserved

---------------------- Page: 5 ----------------------
oSIST prEN ISO 638-2:2022
ISO/FDIS 638-2:2021(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 638-2:2021), of which it constitutes a
minor revision. The changes are as follows:
— editorial update;
— addition of a note in Table B.2.
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 2021 – All rights reserved

---------------------- Page: 6 ----------------------
oSIST prEN ISO 638-2:2022
ISO/FDIS 638-2:2021(E)
Introduction
Determination of dry matter content and water 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 water content of cellulosic nanomaterial suspensions.
[1]
ISO 638-1 is dedicated to the determination of the dry matter content or moisture content in paper,
board, pulp and cellulosic nanomaterials in solid form, which all can be produced from virgin and/or
recycled materials.
[2]
ISO 287 is 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 is used in laboratory procedures or is referred to in other International Standards in which
the stock concentration of an aqueous pulp suspension requires determination.
[4]
ISO 801 (all parts) specifies the determination of saleable mass in lots.
v
© ISO 2021 – All rights reserved

---------------------- Page: 7 ----------------------
oSIST prEN ISO 638-2:2022

---------------------- Page: 8 ----------------------
oSIST prEN ISO 638-2:2022
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 638-2:2021(E)
Paper, board, pulps and cellulosic nanomaterials —
Determination of dry matter content by oven-drying
method —
Part 2:
Suspensions of cellulosic nanomaterials
1 Scope
This document specifies an oven-drying method for the determination of the dry matter content
in suspensions of cellulosic nanomaterials. The procedure is applicable to cellulosic nanomaterial
suspensions 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 cellulosic nanomaterial
suspensions samples taken for chemical and physical tests in the laboratory, when a concurrent
determination of dry matter content is required.
NOTE 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.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
cellulosic nanomaterial
CNM
material composed predominantly of cellulose, with any external dimension in the nanoscale (3.5), or a
material having internal structure or surface structure in the nanoscale, with the internal structure or
surface structure composed predominantly of cellulose
Note 1 to entry: The terms nanocellulose (NC) and cellulose nanomaterial (CNM) are alternative terms for
cellulosic nanomaterial (CNM).
Note 2 to entry: Some cellulosic nanomaterials can be composed of chemically modified cellulose.
[SOURCE: ISO/TS 20477:2017, 3.3.1, modified, ─ "or a material having internal structure or surface
structure in the nanoscale, with the internal structure or surface structure composed predominantly
of cellulose” deleted from the definition; "cellulose" changed to "cellulosic"; Note 3 to entry deleted.]
1
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oSIST prEN ISO 638-2:2022
ISO/FDIS 638-2:2021(E)
3.2
constant mass
mass reached by a container after drying until the difference between two successive
dryings and weighings does not exceed a specified mass fraction of the test specimen after drying
3.3
constant mass
mass reached by a test specimen (3.7) after drying until the difference between two
successive dryings and weighings, separated in time by at least half the initial drying period, does not
exceed a specified mass fraction of the test specimen after drying
3.4
dry matter content
ratio of the mass of a test specimen (3.7), after drying to constant mass (3.3) at a temperature of
105 °C ± 2 °C under specified conditions, to its mass before drying
Note 1 to entry: The dry matter content is usually expressed as a percentage mass fraction.
3.5
nanoscale
length range approximately from 1 nm to 100 nm
Note 1 to entry: Properties that are not extrapolations from larger sizes are predominately exhibited in this
length range.
[SOURCE: ISO/TS 80004-1:2015, 2.1]
3.6
suspension
heterogeneous mixture of materials comprising a liquid and a finely dispersed solid material
Note 1 to entry: As the concentration of cellulosic nanomaterial increases, the suspension becomes more viscous
from liquid to gel.
Note 2 to entry: In the case of cellulosic nanomaterials, a material of a mass fraction of 1 % to 5 % concentration is
generally in gel form depending on the type of cellulosic nanomateri
...