SIST EN ISO 12625-5:2024
(Main)Tissue paper and tissue products - Part 5: Determination of wet tensile strength (ISO 12625-5:2024)
Tissue paper and tissue products - Part 5: Determination of wet tensile strength (ISO 12625-5:2024)
This document specifies a test method for the determination of the wet tensile strength of tissue paper and tissue products after soaking with water, using a tensile-strength-testing apparatus operating with a constant rate of elongation.
Currently, two types of tensile-strength-testing apparatus are commercially available, one where the test piece is positioned vertically and, for the other, horizontally. This document applies for both. For vertical tensile-strength-testing apparatus, a device that is held in the lower grip of the tensile-strength-testing apparatus, called a Finch Cup, is used to achieve the wetting. For horizontal tensile-strength-testing apparatus, the soaking device is placed between the two clamps.
This document is not applicable to cases where impurities and contraries are determined.
Tissue-Papier und Tissue-Produkte - Teil 5: Bestimmung der breitenbezogenen Nassbruchkraft (ISO 12625-5:2024)
Dieses Dokument legt ein Prüfverfahren zur Bestimmung der breitenbezogenen Nassbruchkraft von Tissue-Papier und Tissue-Produkten nach dem Wässern fest. Hierfür wird ein Zugprüfgerät eingesetzt, das mit konstanter Dehnungsgeschwindigkeit arbeitet.
Momentan sind zwei Arten von Zugprüfgeräten im Handel erhältlich. Bei der einen Art von Zugprüfgerät wird die Probe vertikal, bei der anderen horizontal positioniert. Dieses Dokument ist anwendbar für beide. Bei vertikalen Zugprüfgeräten erfolgt das Wässern mit Hilfe einer Vorrichtung, der so genannten Finch-Eintauchvorrichtung, die in der unteren Klemme des Zugprüfgeräts eingespannt wird. Bei horizontalen Zugprüfgeräten wird die Eintauchvorrichtung zwischen den zwei Klemmen angeordnet.
Dieses Dokument ist nicht anwendbar in Fällen, in denen Unreinheiten und Verunreinigungen bestimmt werden.
Papier tissue et produits tissue - Partie 5: Détermination de la résistance à la rupture par traction à l'état humide (ISO 12625-5:2024)
Le présent document spécifie une méthode d’essai pour la détermination de la résistance à la rupture par traction à l’état humide du papier tissue et des produits tissue, après immersion dans l’eau, en utilisant un appareil d’essai de traction fonctionnant à un gradient d’allongement constant.
Deux types d’appareils d’essai de traction sont actuellement commercialisés, l’un où l’éprouvette est placée à la verticale, et l’autre où l’éprouvette est placée à l’horizontale. Le présent document s’applique aux deux types d’appareils. Les appareils d’essai de traction à position verticale utilisent un dispositif maintenu dans la mâchoire inférieure, appelé dispositif d’immersion Finch, pour réaliser le mouillage. Dans le cas des appareils d’essai de traction en position horizontale, le dispositif d’immersion est placé entre les deux mâchoires.
Le présent document ne s’applique pas dans les cas où les impuretés et les défauts sont déterminés.
Tissue higienski papir in proizvodi iz tissue papirja - 5. del: Ugotavljanje mokre natezne trdnosti (ISO 12625-5:2024)
Standard ISO 12625-5:2016 določa preskusno metodo za ugotavljanje mokre natezne trdnosti tissue papirja in proizvodov iz njega po namakanju v vodi, pri čemer se uporablja naprava za preskušanje natezne trdnosti, ki deluje s stalno hitrostjo raztezanja.
Na tržišču sta trenutno na voljo dve vrsti naprav za preskušanje natezne trdnosti; pri eni je preskušanec postavljen navpično, pri drugi pa vodoravno. Ta dokument se uporablja za obe vrsti naprav. Pri napravi, kjer se natezno trdnost preskuša navpično, močenje zagotavlja pripomoček, ki je v spodnjem primežu naprave in se imenuje Finch Cup. Pri napravi, kjer se natezno trdnost preskuša vodoravno, je naprava za namakanje nameščena med čeljustmi.
V primerih, ko je treba določiti nečistoče in nasprotja v tissue papirju in proizvodih iz njega, se uporablja standard ISO 15755 [6].
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2024
Svileni (tissue) papir in proizvodi iz svilenega (tissue) papirja - 5. del: Ugotavljanje
mokre natezne trdnosti (ISO 12625-5:2024)
Tissue paper and tissue products - Part 5: Determination of wet tensile strength (ISO
12625-5:2024)
Tissue-Papier und Tissue-Produkte - Teil 5: Bestimmung der breitenbezogenen
Nassbruchkraft (ISO 12625-5:2024)
Papier tissue et produits tissue - Partie 5: Détermination de la résistance à la rupture par
traction à l'état humide (ISO 12625-5:2024)
Ta slovenski standard je istoveten z: EN ISO 12625-5:2024
ICS:
85.080.20 Tissue papir Tissue paper
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 12625-5
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2024
EUROPÄISCHE NORM
ICS 85.080.20 Supersedes EN ISO 12625-5:2016
English Version
Tissue paper and tissue products - Part 5: Determination
of wet tensile strength (ISO 12625-5:2024)
Papier tissue et produits tissue - Partie 5: Tissue-Papier und Tissue-Produkte - Teil 5:
Détermination de la résistance à la rupture par traction Bestimmung der breitenbezogenen Nassbruchkraft
à l'état humide (ISO 12625-5:2024) (ISO 12625-5:2024)
This European Standard was approved by CEN on 2 June 2024.
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, Türkiye 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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12625-5:2024 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 12625-5:2024) 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 December 2024, and conflicting national standards
shall be withdrawn at the latest by December 2024.
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 12625-5:2016.
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, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 12625-5:2024 has been approved by CEN as EN ISO 12625-5:2024 without any
modification.
International
Standard
ISO 12625-5
Third edition
Tissue paper and tissue products —
2024-05
Part 5:
Determination of wet tensile
strength
Papier tissue et produits tissue —
Partie 5: Détermination de la résistance à la rupture par traction
à l'état humide
Reference number
ISO 12625-5:2024(en) © ISO 2024
ISO 12625-5:2024(en)
© ISO 2024
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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 12625-5:2024(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
5.1 Vertical tensile-strength-testing apparatus .2
5.1.1 Tensile-strength-testing apparatus .2
5.1.2 Tensile-testing apparatus clamps .2
5.1.3 Finch Cup soaking device.3
5.2 Horizontal tensile-strength-testing apparatus .4
5.2.1 Tensile-strength-testing apparatus .4
5.2.2 Tensile-testing apparatus clamps .4
5.2.3 Soaking device .5
5.3 Cutting device .5
6 Conditioning . 5
7 Preparation of test pieces . 5
7.1 General .5
7.2 Accelerated ageing (curing) .5
7.3 Dimensions .6
7.3.1 Vertical tensile-strength-testing apparatus .6
7.3.2 Horizontal tensile-strength-testing apparatus .6
7.4 Number of test pieces .6
8 Procedure . 6
8.1 Calibration and adjustment of the testing apparatus .6
8.2 Vertical test method .6
8.2.1 Mounting the Finch Cup soaking device .6
8.2.2 Measurement .7
8.3 Horizontal test method .7
8.3.1 Wet tensile strength measurement .7
8.3.2 Wet-tensile-strength retention measurement .8
9 Calculation . 9
9.1 General .9
9.2 Wet tensile strength .9
9.3 Mean wet tensile strength retention .9
10 Test report . 10
Annex A (informative) Precision .11
Bibliography .15
iii
ISO 12625-5:2024(en)
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 6, Paper, board and pulps, Subcommittee SC 2,
Test methods and quality specifications for paper and board, 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 third edition cancels and replaces the second edition (ISO 12625-5:2016), which has been technically
revised.
The main changes are as follows:
— updated force measurement requirements (in 5.1.1 and 5.2.1);
— added clarification to 7.2.1 (“accelerated” and “rapid” have the same meaning in this document).
A list of all parts in the ISO 12625 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
International Standard ISO 12625-5:2024(en)
Tissue paper and tissue products —
Part 5:
Determination of wet tensile strength
1 Scope
This document specifies a test method for the determination of the wet tensile strength of tissue paper
and tissue products after soaking with water, using a tensile-strength-testing apparatus operating with a
constant rate of elongation.
Currently, two types of tensile-strength-testing apparatus are commercially available, one where the test
piece is positioned vertically and, for the other, horizontally. This document applies for both. For vertical
tensile-strength-testing apparatus, a device that is held in the lower grip of the tensile-strength-testing
apparatus, called a Finch Cup, is used to achieve the wetting. For horizontal tensile-strength-testing
apparatus, the soaking device is placed between the two clamps.
This document is not applicable to cases where impurities and contraries are determined.
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 187, Paper, board and pulps — Standard atmosphere for conditioning and testing and procedure for
monitoring the atmosphere and conditioning of samples
ISO 1924-2, Paper and board — Determination of tensile properties — Part 2: Constant rate of elongation
method (20 mm/min)
ISO 7500-1, Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1:
Tension/compression testing machines — Calibration and verification of the force-measuring system
ISO 12625-1, Tissue paper and tissue products — Part 1: Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12625-1 and the following 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
wet tensile strength
maximum tensile force per unit width that a test piece soaked with water will withstand before breaking
Note 1 to entry: The wet tensile strength is expressed in newtons per metre (N/m).
ISO 12625-5:2024(en)
3.2
wet-tensile-strength retention
ratio, expressed as a percentage, of the tensile strength of the wet test piece to the tensile strength of a
different test piece from the same sample in the dry, conditioned state
Note 1 to entry: “Conditioned state” according to ISO 187.
4 Principle
A test piece of tissue paper or tissue product of given dimensions, soaked in water for a given period of time
under specified conditions, is stretched (elongated) to break at a constant rate of elongation, using a tensile-
strength-testing apparatus that measures and records the tensile force as a function of the elongation of the
test piece.
The test can be carried out by a vertical or a horizontal tensile-strength-testing apparatus.
In order to wet the test pieces for a vertical tensile-strength-testing apparatus, a device called a Finch Cup,
which is held to the lower clamp, is used. For a horizontal tensile-strength-testing apparatus, a soaking cup
is inserted between the clamps.
From the wet tensile strength and the tensile strength of the same sample in the dry conditioned state, the
wet-tensile-strength retention can be calculated.
Precision data are available in Annex A.
5 Apparatus
5.1 Vertical tensile-strength-testing apparatus
5.1.1 Tensile-strength-testing apparatus
The tensile-strength-testing apparatus shall be in accordance with ISO 1924-2. It is capable of stretching
a test piece of tissue paper or tissue product of given dimensions at a constant rate of elongation of
(50 ± 2) mm/min, and recording the tensile force as a function of elongation on a strip chart recorder or any
equivalent device.
The force-measuring system (normally a load cell) shall measure loads with an accuracy of ±1 % of the
reading or ±0,025 N, whichever is greater, and shall be calibrated in accordance with the requirements of
ISO 7500-1.
5.1.2 Tensile-testing apparatus clamps
The tensile-strength-testing apparatus (5.1.1) shall have an upper clamp with a minimum of 50 mm width,
for holding both ends of the test piece firmly and without slippage. To avoid damaging the test pieces, the
clamp surfaces that touch the pieces should be smooth and have rounded edges, i.e. free from burrs. The
lower clamp shall be designed to grip the Finch Cup soaking device (5.1.3) firmly. The clamps shall have
means for adjusting the clamping force.
During the test, the upper clamping line and the Finch Cup soaking device (5.1.3) rod shall be parallel to
each other. They shall also be perpendicular to the direction of the applied tensile force and to the length
axis of the test piece.
The distance between A and B is the total span length and shall be (100 ± 1) mm. The distance between A and
B divided by two is the test span length and shall be (50 ± 1) mm. See Figure 1 for positioning of a test piece.
ISO 12625-5:2024(en)
Dimensions in millimetres
Key
A clamping line on one end of the test piece
B clamping line on the other end of the test piece
Figure 1 — Positioning of a test piece
5.1.3 Finch Cup soaking device
A Finch Cup soaking device (see Figure 2) consists of a support system that holds a horizontal cylindrical
rod of (5,0 ± 0,1) mm diameter, and approximately 60 mm length, and a water container.
The water container shall be constructed such that it can be moved vertically and locked in a raised position.
In the locked raised position
...
SLOVENSKI STANDARD
01-julij-2024
Tissue higienski papir in proizvodi iz tissue papirja - 5. del: Ugotavljanje mokre
natezne trdnosti (ISO 12625-5:2024)
Tissue paper and tissue products - Part 5: Determination of wet tensile strength (ISO
12625-5:2024)
Tissue-Papier und Tissue-Produkte - Teil 5: Bestimmung der breitenbezogenen
Nassbruchkraft (ISO 12625-5:2024)
Papier tissue et produits tissue - Partie 5: Détermination de la résistance à la rupture par
traction à l'état humide (ISO 12625-5:2024)
Ta slovenski standard je istoveten z: EN ISO 12625-5:2024
ICS:
85.080.20 Tissue papir Tissue paper
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 12625-5
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2024
EUROPÄISCHE NORM
ICS 85.080.20 Supersedes EN ISO 12625-5:2016
English Version
Tissue paper and tissue products - Part 5: Determination
of wet tensile strength (ISO 12625-5:2024)
Papier tissue et produits tissue - Partie 5: Tissue-Papier und Tissue-Produkte - Teil 5:
Détermination de la résistance à la rupture par traction Bestimmung der breitenbezogenen Nassbruchkraft
à l'état humide (ISO 12625-5:2024) (ISO 12625-5:2024)
This European Standard was approved by CEN on 2 June 2024.
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, Türkiye 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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12625-5:2024 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 12625-5:2024) 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 December 2024, and conflicting national standards
shall be withdrawn at the latest by December 2024.
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 12625-5:2016.
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, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 12625-5:2024 has been approved by CEN as EN ISO 12625-5:2024 without any
modification.
International
Standard
ISO 12625-5
Third edition
Tissue paper and tissue products —
2024-05
Part 5:
Determination of wet tensile
strength
Papier tissue et produits tissue —
Partie 5: Détermination de la résistance à la rupture par traction
à l'état humide
Reference number
ISO 12625-5:2024(en) © ISO 2024
ISO 12625-5:2024(en)
© ISO 2024
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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 12625-5:2024(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
5.1 Vertical tensile-strength-testing apparatus .2
5.1.1 Tensile-strength-testing apparatus .2
5.1.2 Tensile-testing apparatus clamps .2
5.1.3 Finch Cup soaking device.3
5.2 Horizontal tensile-strength-testing apparatus .4
5.2.1 Tensile-strength-testing apparatus .4
5.2.2 Tensile-testing apparatus clamps .4
5.2.3 Soaking device .5
5.3 Cutting device .5
6 Conditioning . 5
7 Preparation of test pieces . 5
7.1 General .5
7.2 Accelerated ageing (curing) .5
7.3 Dimensions .6
7.3.1 Vertical tensile-strength-testing apparatus .6
7.3.2 Horizontal tensile-strength-testing apparatus .6
7.4 Number of test pieces .6
8 Procedure . 6
8.1 Calibration and adjustment of the testing apparatus .6
8.2 Vertical test method .6
8.2.1 Mounting the Finch Cup soaking device .6
8.2.2 Measurement .7
8.3 Horizontal test method .7
8.3.1 Wet tensile strength measurement .7
8.3.2 Wet-tensile-strength retention measurement .8
9 Calculation . 9
9.1 General .9
9.2 Wet tensile strength .9
9.3 Mean wet tensile strength retention .9
10 Test report . 10
Annex A (informative) Precision .11
Bibliography .15
iii
ISO 12625-5:2024(en)
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 6, Paper, board and pulps, Subcommittee SC 2,
Test methods and quality specifications for paper and board, 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 third edition cancels and replaces the second edition (ISO 12625-5:2016), which has been technically
revised.
The main changes are as follows:
— updated force measurement requirements (in 5.1.1 and 5.2.1);
— added clarification to 7.2.1 (“accelerated” and “rapid” have the same meaning in this document).
A list of all parts in the ISO 12625 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
International Standard ISO 12625-5:2024(en)
Tissue paper and tissue products —
Part 5:
Determination of wet tensile strength
1 Scope
This document specifies a test method for the determination of the wet tensile strength of tissue paper
and tissue products after soaking with water, using a tensile-strength-testing apparatus operating with a
constant rate of elongation.
Currently, two types of tensile-strength-testing apparatus are commercially available, one where the test
piece is positioned vertically and, for the other, horizontally. This document applies for both. For vertical
tensile-strength-testing apparatus, a device that is held in the lower grip of the tensile-strength-testing
apparatus, called a Finch Cup, is used to achieve the wetting. For horizontal tensile-strength-testing
apparatus, the soaking device is placed between the two clamps.
This document is not applicable to cases where impurities and contraries are determined.
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 187, Paper, board and pulps — Standard atmosphere for conditioning and testing and procedure for
monitoring the atmosphere and conditioning of samples
ISO 1924-2, Paper and board — Determination of tensile properties — Part 2: Constant rate of elongation
method (20 mm/min)
ISO 7500-1, Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1:
Tension/compression testing machines — Calibration and verification of the force-measuring system
ISO 12625-1, Tissue paper and tissue products — Part 1: Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12625-1 and the following 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
wet tensile strength
maximum tensile force per unit width that a test piece soaked with water will withstand before breaking
Note 1 to entry: The wet tensile strength is expressed in newtons per metre (N/m).
ISO 12625-5:2024(en)
3.2
wet-tensile-strength retention
ratio, expressed as a percentage, of the tensile strength of the wet test piece to the tensile strength of a
different test piece from the same sample in the dry, conditioned state
Note 1 to entry: “Conditioned state” according to ISO 187.
4 Principle
A test piece of tissue paper or tissue product of given dimensions, soaked in water for a given period of time
under specified conditions, is stretched (elongated) to break at a constant rate of elongation, using a tensile-
strength-testing apparatus that measures and records the tensile force as a function of the elongation of the
test piece.
The test can be carried out by a vertical or a horizontal tensile-strength-testing apparatus.
In order to wet the test pieces for a vertical tensile-strength-testing apparatus, a device called a Finch Cup,
which is held to the lower clamp, is used. For a horizontal tensile-strength-testing apparatus, a soaking cup
is inserted between the clamps.
From the wet tensile strength and the tensile strength of the same sample in the dry conditioned state, the
wet-tensile-strength retention can be calculated.
Precision data are available in Annex A.
5 Apparatus
5.1 Vertical tensile-strength-testing apparatus
5.1.1 Tensile-strength-testing apparatus
The tensile-strength-testing apparatus shall be in accordance with ISO 1924-2. It is capable of stretching
a test piece of tissue paper or tissue product of given dimensions at a constant rate of elongation of
(50 ± 2) mm/min, and recording the tensile force as a function of elongation on a strip chart recorder or any
equivalent device.
The force-measuring system (normally a load cell) shall measure loads with an accuracy of ±1 % of the
reading or ±0,025 N, whichever is greater, and shall be calibrated in accordance with the requirements of
ISO 7500-1.
5.1.2 Tensile-testing apparatus clamps
The tensile-strength-testing apparatus (5.1.1) shall have an upper clamp with a minimum of 50 mm width,
for holding both ends of the test piece firmly and without slippage. To avoid damaging the test pieces, the
clamp surfaces that touch the pieces should be smooth and have rounded edges, i.e. free from burrs. The
lower clamp shall be designed to grip the Finch Cup soaking device (5.1.3) firmly. The clamps shall have
means for adjusting the clamping force.
During the test, the upper clamping line and the Finch Cup soaking device (5.1.3) rod shall be parallel to
each other. They shall also be perpendicular to the direction of the applied tensile force and to the length
axis of the test piece.
The distance between A and B is the total span length and shall be (100 ± 1) mm. The distance between A and
B divided by two is the test span length and shall be (50 ± 1) mm. See Figure 1 for positioning of a test piece.
ISO 12625-5:2024(en)
Dimensions in millimetres
Key
A clamping line on one end of the test piece
B clamping line on the other end of the test piece
Figure 1 — Positioning of a test piece
5.1.3 Finch Cup soaking device
A Finch Cup soaking device (see Figure 2) consists of a support system that holds a horizontal cylindrical
rod of (5,0 ± 0,1) mm diameter, and approximately 60 mm length, and a water container.
The water container shall be constructed such that it can be moved vertically and locked in a raised position.
In the locked raised position, the
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