ISO 4907-2:2023

Plastics — Ion exchange resin — Part 2: Determination of water content of anion exchange resins in hydroxide form by centrifugation

This document specifies test methods by centrifugation of water content of styrene anion exchange resins in hydroxide form.

Plastiques — Résine échangeuse d'ions — Partie 2: Détermination de la teneur en eau des résines échangeuses d'anions sous forme d'hydroxyde par centrifugation

General Information

• Status: Published
• Publication Date: 17-Apr-2023
• ICS: 83.080.01 - Plastics in general
• Technical Committee: ISO/TC 61/SC 5 - Physical-chemical properties
• Drafting Committee: ISO/TC 61/SC 5/WG 11 - Analytical methods
• Current Stage: 6060 - International Standard published
• Start Date: 18-Apr-2023
• Due Date: 30-Jun-2023
• Completion Date: 18-Apr-2023

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 4907-2
First edition
2023-04
Plastics — Ion exchange resin —
Part 2:
Determination of water content of
anion exchange resins in hydroxide
form by centrifugation
Reference number
ISO 4907-2:2023(E)
© ISO 2023

---------------------- Page: 1 ----------------------
ISO 4907-2:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
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 2023 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 4907-2:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 2
6 Apparatus . 2
7 Samples . 3
8 Procedure .3
8.1 Removal of the external water . 3
8.2 Determination of water content . . 3
9 Calculation . 4
10 Test Report .4
Annex A (normative) Sampling . 5
Annex B (informative) Formulae and derivations . 7
iii
© ISO 2023 – All rights reserved

---------------------- Page: 3 ----------------------
ISO 4907-2:2023(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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all
such patent rights.
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 61, Plastics, Subcommittee SC 5, Physical-
chemical properties.
A list of all parts in the ISO 4907 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 2023 – All rights reserved

---------------------- Page: 4 ----------------------
ISO 4907-2:2023(E)
Introduction
Anion exchange resins in hydroxide form have poor thermal stability, so direct drying at high
temperatures should be avoided. This document solves this problem by form transition process and
conversion.
Formulae and derivations are given in Annex B.
v
© ISO 2023 – All rights reserved

---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 4907-2:2023(E)
Plastics — Ion exchange resin —
Part 2:
Determination of water content of anion exchange resins in
hydroxide form by centrifugation
1 Scope
This document specifies test methods by centrifugation of water content of styrene anion exchange
resins in hydroxide 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 3696, Water for analytical laboratory use — Specification and test methods
ISO 4907-3:2023, Plastics — Ion exchange resin — Part 3: Determination of exchange capacity of anion
exchange resins in hydroxide form
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological 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
hydroxide form styrene anion exchange resin
ionic type of styrene anion exchange resins regenerated by sodium hydroxide solution under the
conditions specified in this document
Note 1 to entry: It is a general term that includes the strong-base groups existing in hydroxide form and the
weak-base groups existing in free amine form.
3.2
water content
equilibrium water content in hydroxide form styrene anion exchange resin (3.1)
4 Principle
Remove the external water of the styrene anion exchange resin in hydroxide form absorbed enough
water by centrifugation and convert it to chloride form by hydrochloric acid. Wash away the excess acid
with anhydrous ethanol. The water content of the sample can be tested by the loss of mass on drying at
105 °C, as well as the increment of mass on the form conversion.
1
© ISO 2023 – All rights reserved

---------------------- Page: 6 ----------------------
ISO 4907-2:2023(E)
5 Reagents
WARNING — Reagents used in this document may can potential hazards to human health and
the environment. Ensure that the instructions for the use of reagents are strictly followed.
Unless otherwise indicated, the reagents specified in this document should be analytical grade.
Commercially available, ready-made solutions may be used.
5.1 Anhydrous ethanol
5.2 Water, grade 2 in accordance with ISO 3696.
5.3 Hydrochloric acid solution, c(HCl) = 1 mol/l.
Dilute 90 ml of hydrochloric acid (1,19 g/ml) to 1 000 ml with water.
5.4 Silver nitrate solution indicator.
Dissolve 5 g of silver nitrate in water and dilute to 100 ml. Store in an amber glass bottle.
5.5 High temperature res
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 4907-2
ISO/TC 61/SC 5
Plastics — Ion exchange resin —
Secretariat: DIN
Voting begins on:
Part 2:
2023-01-30
Determination of water content of
Voting terminates on:
anion exchange resins in hydroxide
2023-03-27
form by centrifugation
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 4907-2:2023(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 2023

---------------------- Page: 1 ----------------------
ISO/FDIS 4907-2:2023(E)
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 4907-2
ISO/TC 61/SC 5
Plastics — Ion exchange resin —
Secretariat: DIN
Voting begins on:
Part 2:
Determination of water content of
Voting terminates on:
anion exchange resins in hydroxide
form by centrifugation
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
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.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
ISO copyright office
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
CP 401 • Ch. de Blandonnet 8
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
CH-1214 Vernier, Geneva
DOCUMENTATION.
Phone: [phone]
IN ADDITION TO THEIR EVALUATION AS
Reference number
Email: [e-mail]
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 4907-2:2023(E)
Website: www.iso.org
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
Published in Switzerland
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
ii
  © ISO 2023 – All rights reserved
NATIONAL REGULATIONS. © ISO 2023

---------------------- Page: 2 ----------------------
ISO/FDIS 4907-2:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 2
6 Apparatus . 2
7 Samples . 3
8 Procedure .3
8.1 Removal of the external water . 3
8.2 Determination of water content . . 3
9 Calculation . 4
10 Test Report .4
Annex A (normative) Sampling . 5
Annex B (informative) Formulae and derivations . 7
iii
© ISO 2023 – All rights reserved

---------------------- Page: 3 ----------------------
ISO/FDIS 4907-2:2023(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 61, Plastics, Subcommittee SC 5, Physical-
chemical properties.
A list of all parts in the ISO 4907 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 2023 – All rights reserved

---------------------- Page: 4 ----------------------
ISO/FDIS 4907-2:2023(E)
Introduction
Anion exchange resins in hydroxide form have poor thermal stability, so direct drying at high
temperatures should be avoided. This document solves this problem by form transition process and
conversion.
Formulae and derivations are given in Annex B.
v
© ISO 2023 – All rights reserved

---------------------- Page: 5 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 4907-2:2023(E)
Plastics — Ion exchange resin —
Part 2:
Determination of water content of anion exchange resins in
hydroxide form by centrifugation
1 Scope
This document specifies test methods by centrifugation of water content of styrene anion exchange
resins in hydroxide 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 3696, Water for analytical laboratory use — Specification and test methods
ISO 4907-3:2023, Plastics — Ion exchange resin — Part 3: Determination of exchange capacity of anion
exchange resins in hydroxide form
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological 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
hydroxide form styrene anion exchange resin
ionic type of styrene anion exchange resins regenerated by sodium hydroxide solution under the
conditions specified in this document
Note 1 to entry: It is a general term that includes the strong-base groups existing in hydroxide form and the
weak-base groups existing in free amine form.
3.2
water content
equilibrium water content in hydroxide form styrene anion exchange resin (3.1)
4 Principle
Remove the external water of the styrene anion exchange resin in hydroxide form absorbed enough
water by centrifugation and convert it to chloride form by hydrochloric acid. Wash away the excess acid
with anhydrous ethanol. The water content of the sample can be tested by the loss of mass on drying at
105 °C, as well as the increment of mass on the form conversion.
1
© ISO 2023 – All rights reserved

---------------------- Page: 6 ----------------------
ISO/FDIS 4907-2:2023(E)
5 Reagents
WARNING — Reagents used in this document may can potential hazards to human health and
the environment. Ensure t
...

ISO/FDIS 4907-2:20222023(E)
ISO TC 61/SC 5/WG 11
Date: 2022-112023-01-13
Secretariat: DIN
Plastics — Ion exchange resin — Part 2: Determination of water content of anion exchange
resins in hydroxide form by centrifugation

---------------------- Page: 1 ----------------------
ISO/FDIS 4907-2:2023(E)
© ISO 20222023
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.orgwww.iso.org
Published in Switzerland
ii © ISO 2023 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/FDIS 4907-2:2023(E)
Contents
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 1
6 Apparatus . 2
7 Samples . 3
8 Procedure . 3
8.1 Removal of the external water . 3
8.2 Determination of water content . 3
9 Calculation . 4
10 Test Report . 4
Annex A (normative) Sampling . 5
Annex B (informative) Formula and derivation . 7

© ISO 2023 – All rights reserved iii

---------------------- Page: 3 ----------------------
ISO/FDIS 4907-2:2023(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/directiveswww.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/patentswww.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’sISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.htmlwww.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 5, Physical-
chemical properties.
A list of all parts in the ISO 4907 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.htmlwww.iso.org/members.html.
iv © ISO 2023 – All rights reserved

---------------------- Page: 4 ----------------------
ISO/FDIS 4907-2:2023(E)
Introduction
Anion exchange resins in hydroxide form have poor thermal stability, so direct drying at high
temperatures should be avoided. This document solves this problem by form transition process and
conversion.
Formulae and derivations are given in Annex B.
© ISO 2023 – All rights reserved v

---------------------- Page: 5 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 4907-2:2023(E)

Plastics — Ion exchange resin — Part 2: Determination of water
content of anion exchange resins in hydroxide form by
centrifugation
1 Scope
This document specifies test methods by centrifugation of water content of styrene anion exchange
resins in hydroxide 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 3696, Water for analytical laboratory use — Specification and test methods
ISO 4907-3:202y2023, Plastics — Ion exchange resin — Part 3: Determination of exchange capacity of
anion exchange resins in hydroxide form
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological 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
hydroxide form styrene anion exchange resin
ionic type of styrene anion exchange resins regenerated by sodium hydroxide solution under the
conditions specified in this document
Note 1 to entry: It is a general term that includes the strong-base groups existing in hydroxide form and the
weak-base groups existing in free amine form.
3.2
water content
equilibrium water content in hydroxide form styrene anion exchange resin (3.1)
4 Principle
Remove the external water of the styrene anion exchange resin in hydroxide form absorbed enough
water by centrifugation and convert it to chloride form by hydrochloric acid. Wash away the excess acid
with anhydrous ethanol. The water content of the sample can be tested by the loss of mass on drying at
105 °C, as well as the increment of mass on the form conversion.
© ISO 2023 – All rights reserved 1

---------------------- Page: 6 ----------------------
ISO/DIS 4907-2:2023(E)
5 Reagents
WARNING — Reagents used in this document may havecan potential hazards to human health and the
environment. Please strictly followEnsure that the instructions for the use of reagents are strictly
followed.
Unless otherwise indicated, the reagents specified in this document should be analytical grade.
Commercially available, ready-made solutions may be used.
5.1 Anhydrous ethanol
5.2 Water, grade 2 in accordance with ISO 3696.
5.3 Hydrochloric acid solution, c(HCl) = 1 mol/l.
Dilute 90 ml of hydrochloric acid (1,19 g/ml) to 1 000 ml with water.
5.4 Silver nitrate solution indicator.
Dissolve 5 g of silver nitrate in water and dilute to 100 ml. Store in an amber glass bottle.
5.5 High temperature resistant grease.
Dropping point shall be more than 200 °C.
6 Apparatus
WARNING — AapparatusApparatus used in this document may have potential hazards to human
health and the environment. Please strictly followEnsure that the instructions for the use of apparatus
are strictly followed.
Usual laboratory equipment and, in particular, the following should be used:.
6.1 Water content analyser (see Figure 1), standard grinding mouth BM 19/26, No.1 micro porous
(80 µm to 120 µm) sand core, ϕ =3 mm.

2 © ISO 2023 – All rights reserved

---------------------- Page: 7 ----------------------
ISO/DIS 4907-2:2023(E)

Figure 1 — Water content analyser
6.2 Separating funnel, standard grinding mouth BM 19/26.
6.3 Centrifuge, maximum adjustable speed: 5 000 r/min (523 rad/s), the accuracy is below
±200 r/min (21 rad/s); maximum RCF: about 4 400 × g; time adjustable range: higher than 5 min, the
accuracy is ±2 s; capacity: 4 × 100 ml.
6.4 Centrifugal filter tube (see Figu
...