IEC 60793-1-32:2018
(Main)Optical fibres - Part 1-32: Measurement methods and test procedures - Coating strippability
Optical fibres - Part 1-32: Measurement methods and test procedures - Coating strippability
IEC 60793-1-32:2018 is intended primarily for testing either fibres as produced by a fibre manufacturer or subsequently overcoated (tight buffered) using various polymers. The test can be performed either on fibres as produced, or after exposure to various environments. This test applies to A1, A2, A3, B and C fibres with a nominal glass dimension of 125 µm. The object of this document is to establish uniform requirements for the mechanical characteristic – coating strippability. This test quantifies the force required to mechanically remove the protective coating from optical fibres along their longitudinal axis. This test is not intended as a means to maximize fibre strength after the coating is removed nor is it intended to specify the best conditions for field stripping of optical fibres. This test is designed for optical fibres having polymeric coatings with nominal outer diameters in the range of 200 µm to 900 µm. This third edition cancels and replaces the second edition published in 2010. This edition constitutes a technical revision. This edition includes the following significant technical change with respect to the previous edition: expansion of the range of coating dimensions applicable to the procedure detailed in this document to accommodate optical fibres with a 200 µm coating dimension.
Keywords: coating strippability, protective coating of optical fibres
Fibres optiques - Partie 1-32: Méthodes de mesure et procédures d'essai - Dénudabilité du revêtement
L'IEC 60793-1-32:2018 est destinée principalement aux essais des fibres, dès leur production par un fabricant de fibres, ou après revêtement ultérieur (revêtement protecteur serré) au moyen de divers polymères. L'essai peut être effectué sur des fibres issues de production, ou bien après exposition à divers environnements. Le présent essai s'applique aux fibres de types A1, A2, A3, B et C avec une dimension de verre nominale de 125 µm. L'objet du présent document est d'établir des exigences uniformes pour la caractéristique mécanique: dénudabilité du revêtement. Le présent essai permet de quantifier la force exigée pour retirer mécaniquement le revêtement de protection des fibres optiques le long de leur axe longitudinal. Cet essai n'est pas destiné à augmenter au maximum la résistance de la fibre après retrait du revêtement de protection, ni à spécifier les meilleures conditions pour le dénudage sur site de fibres optiques. Cet essai est conçu pour les fibres optiques ayant des revêtements polymères avec des diamètres extérieurs nominaux se situant dans la plage comprise entre 200 µm et 900 µm. Cette troisième édition annule et remplace la deuxième édition parue en 2010. Cette édition constitue une révision technique. Cette édition inclut la modification technique majeure suivante par rapport à l'édition précédente: élargissement de la plage des dimensions de revêtement applicables au mode opératoire présenté dans le présent document pour correspondre aux fibres optiques disposant d'une dimension de revêtement de 200 µm.
Mots-clés : dénudabilité du revêtement, revêtement de protection des fibres optiques
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IEC 60793-1-32 ®
Edition 3.0 2018-11
REDLINE VERSION
INTERNATIONAL
STANDARD
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inside
Optical fibres –
Part 1-32: Measurement methods and test procedures – Coating strippability
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IEC 60793-1-32 ®
Edition ¨3.0 2018-11
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Optical fibres –
Part 1-32: Measurement methods and test procedures – Coating strippability
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.10 ISBN 978-2-8322-4595-8
– 2 – IEC 60793-1-32:2018 RLV © IEC 2018
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Apparatus . 6
4.1 Tensile equipment. 6
4.2 Load cell . 6
4.3 Transducer amplifier . 6
4.4 Stripping tool . 7
4.5 Fibre guide . 7
5 Specimen preparation . 7
5.1 Representative sample . 7
5.2 Strip length . 7
6 Procedure . 8
6.1 Introduction General . 8
6.2 Stripping rate . 8
6.3 Preconditioning . 8
6.4 Calibrating the transducer amplifier . 8
6.5 Loading the test specimen . 9
6.6 Stripping the coating . 9
7 Calculations . 9
7.1 Calculation for the value of a specimen . 9
7.1.1 General . 9
7.1.2 Approach 1 – Average strip force . 9
7.1.3 Approach 2 – Peak strip force . 9
7.2 Calculation of the reported value for a specimen . 9
8 Documentation . 9
8.1 The following Information should to be presented . 9
8.2 The following Information should to be available for each test . 10
9 Specification information . 10
Bibliography . 11
Figure 1 – Example of test arrangement . 6
Figure 2 – Length of fibre to be stripped . 8
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRES –
Part 1-32: Measurement methods and test procedures –
Coating strippability
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC
Publication(s)"). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition. A vertical bar appears in the margin wherever a change
has been made. Additions are in green text, deletions are in strikethrough red text.
– 4 – IEC 60793-1-32:2018 RLV © IEC 2018
International Standard IEC 60793-1-32 has been prepared by subcommittee 86A: Fibres and
cables, of IEC technical committee 86: Fibre optics.
This third edition cancels and replaces the second edition published in 2010. This edition
constitutes a technical revision.
This edition includes the following significant technical change with respect to the previous
edition: expansion of the range of coating dimensions applicable to the procedure detailed in
this document to accommodate optical fibres with a 200 µm coating dimension.
The text of this International Standard is based on the following documents:
FDIS Report on voting
86A/1890/FDIS 86A/1899/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60793 series, published under the general title Optical fibres, can
be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
urs which are considered to be useful for the correct
that it contains colo
understanding of its contents. Users should therefore print this document using a
colour printer.
OPTICAL FIBRES –
Part 1-32: Measurement methods and test procedures –
Coating strippability
1 Scope
This part of IEC 60793 is intended primarily for testing either fibres as produced by a fibre
manufacturer or subsequently overcoated (tight buffered) using various polymers. The test
can be performed either on fibres as produced, or after exposure to various environments.
This test applies to A1, A2, A3, B and C fibres with a nominal glass dimension of 125 µm.
The object of this document is to establish uniform requirements for the mechanical
characteristic – coating strippability. This test quantifies the force required to mechanically
remove the protective coating from optical fibres along their longitudinal axis.
This test is not intended as a means to maximize fibre strength after the coating is removed
nor is it intended to specify the best conditions for field stripping of optical fibres.
This test is designed for optical fibres having polymeric coatings with nominal outer diameters
in the range of 200 µm to 900 µm. Application of this method to fibres with outer coating
diameters outside the range of 230 µm to 930 µm is not recommended.
Warning – Fibres can fracture while being stripped and pierce skin and eyes. Use of
protective eyewear is recommended.
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.
IEC 60793-1 (all parts), Optical fibres – Measurement methods and test procedures
IEC 60793-1-1, Optical fibres – Part 1-1: Measurement methods and test procedures –
General and guidance
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
– 6 – IEC 60793-1-32:2018 RLV © IEC 2018
4 Apparatus
4.1 Tensile equipment
Use a suitable device, for example a vertical tensile tester, which provides relative motion
between the test fibre and a stripping tool and is capable of imparting constant motion at the
velocity found in 6.2, without jerking the fibre under test or the stripping tool.
Use a device capable of providing relative motion in two directions to allow resetting. Provide
suitable means for clamping and maintaining the stripping tool blades perpendicular to the
fibre axis or in a position that prevents fibre bending, and for securing one end of the test
fibre. To prevent fibre breakage, secure the fibre at the clamping point without stressing the
fibre excessively.
Examples of test arrangements are shown in Figure 1.
NOTE Either the stripping tool or the capstan is fixed.
Figure 1 – Example of test arrangement
4.2 Load cell
Use any appropriate device that is capable of sensing the force imparted to the fibre during
the removal of the fibre coating.
4.3 Transducer amplifier
This device receives signals from the load cell and indicates the tensile force on the test fibre
up to the point when the coating is stripped off. The transducer shall acquire the force data at
a rate greater than 100 Hz. The transducer and/or measurement system shall have the ability
to plot the test data on a continuous chart, such as a strip chart or line chart. It shall also have
the capability of capturing sufficient information to calculate the maximum and average forces,
along with the amplitude and frequencies of any oscillations in the force during the stripping
process.
The accuracy of the force measurement shall be stated in the detail specification.
4.4 Stripping tool
4.4.1 Because the results from this test are strongly dependent upon the design of tool
used, it is important that the following tool design guidelines be observed.
a) Unless otherwise specified in the detail specification, use tool blades with the diameter of
the hole greater than the nominal cladding diameter of the fibre to be stripped in order not
to damage the cladding surface. The recommended stripping tool shall should be
constructed such that the blades form a circular aperture. Other blade configurations may
be used as long as it can be shown that the results correlate to ones with a circular
aperture [1] . A practical example is a hole which is 15 µm larger that the nominal
cladding diameter; for 125 µm cladding diameter fibres, this results in a 140 µm circular
hole.
b) The stripping tool blades shall be constructed such that the blades do not cause fibre
bending. Stripping tools in which the blades butt together in the same plane are preferred
in this test.
4.4.2 Mount the stripping tool on the test fixture and provide a means to hold it closed
around the fibre using suitable clamps. Ensure the fibre is pulled in a direction normal to the
plane of the blades.
4.4.3 Replace the stripping tools at intervals as dictated by a documented quality
schedule, when the blades become dull or damaged, or whenever wear appears sufficient to
affect the test results.
NOTE Tool wear can affect any or all of the following:
• fibre breakage;
• the amount of residue left on the glass surface;
• the way in which the coating is removed from the fibre;
• the force required to remove the coatings.
4.5 Fibre guide
A fibre guide shall be provided to support the fibre that extends past the stripping tool blade
(if not already designed into the tool) and which meets the following requirements:
a) the guide shall support the fibre to prevent sagging due to the weight of the fibre;
b) the guide shall prevent bending of the fibre caused by buckling of the fibre coating as it is
removed;
c) the guide shall be located as close to the stripping tool as possible without interfering with
the stripping operation;
d) the guide shall allow for easy insertion into the test set-up and for easy cleaning, and shall
provide freedom from interference if the coating buckles.
5 Specimen preparation
5.1 Representative sample
The sampling should shall consist of a minimum of 10 specimens assumed to be
representative of the population of fibres under evaluation. The specimens should shall be
tested and their results will be averaged.
___________
Numbers in square brackets refer to the Bibliography.
– 8 – IEC 60793-1-32:2018 RLV © IEC 2018
5.2 Strip length
The length of fibre stripped on a particular piece can affect the strip force. However, for
245 µm nominal 200 µm and 250 µm coating diameter fibres, the length of fibre stripped has
minimal effect on the strip force. The length of fibre stripped shall be specified in the detail
specification. For 245 µm nominal 200 µm and 250 µm coating diameter fibres, a preferred
value is 30 mm. For larger coating diameter, shorter stripping lengths are preferred, for
example 15 mm.
To perform the measurement, a specimen of fibre must shall be provided that is longer than
just the specified length to be stripped. The total specimen length consists of the fibre
required to secure itself to the capstan, the fibre between the capstan and the stripping tool
(see Figure 1) and the fibre length to be stripped that extends past the stripping tool
(see Figure 2). The total specimen length shall be sufficiently long to meet this deployment.
The test results are not dependent on the total sample length. The test results are, in part,
dependent on the length of fibre to be stripped.
Figure 2 – Length of fibre to be stripped
6 Procedure
6.1 Introduction General
This procedure involves
a) severing the coating at the prescribed distance from the end of the fibre, and then
b) removing the coating from the fibre while measuring the force required to accomplish this
removal.
Use of protective eyewear is recommended as fibres can fracture while being stripped and
pierce skin and eyes.
6.2 Stripping rate
The force required to remove coatings from fibre is dependent, in part, on the stripping rate. If
results of different tests are to be comparable, the same stripping rate should shall be used.
Set up the test equipment so as to impart a relative motion between the fibre and the stripping
tool at the rate specified in the detail specification. A preferred value for 245 µm nominal 200
µm and 250 µm coating diameter is 500 mm/min. For fibres with larger nominal coating
diameter, a lower value is preferred, for example 10 mm/min to 25 mm/min.
6.3 Preconditioning
Unless otherwise specified, pre-condition the test samples for a minimum of 2 h at the
standard test conditions given in IEC 60793-1-1 series.
6.4 Calibrating the transducer amplifier
Calibrate the transducer and load cell before each series of tests or as dictated by a
documented calibration schedule.
6.5 Loading the test specimen
Ensure the area around both blades of the stripping tool is free of debris and/or build-up from
any previous use before loading the fibre.
Secure one end of the test fibre to the test fixture so that it will not slip under load (e.g. wrap
one end of the fibre three times around an 80-mm diameter capstan). Thread the other end
through the stripping tool and insert it through the fibre guide/support.
6.6 Stripping the coating
Start the test apparatus to provide a constant relative motion between the fibre and the
stripping tool.
Observe and record the force required to remove the coating from the glass fibre. Exclude
data from fibres that break during the test.
The test is complete when the coating has been completely removed from the fibre.
NOTE Any remaining coating residue visible to the naked eye should shall be easy to remove
by gently wiping the fibre with a laboratory tissue.
7 Calculations
7.1 Calculation for the value of a piece specimen
7.1.1 General
There are two approaches to measuring strip force. Both incorporate the same experimental
technique but each emphasizes a different focal point for the strip force.
7.1.2 Approach 1 – Average strip force
Start the test apparatus to provide a constant relative motion between fibre and stripping tool.
Observe and record the force required to remove the coating from the glass fibre. Exclude
data from fibres that break during the test. The average strip force is then calculated,
excluding the initial 20 % of the strip length data. The average of the sampling strip force
values is then reported as "average strip force".
7.1.3 Approach 2 – Peak strip force
Start the test apparatus to provide a constant relative motion between the fibre and stripping
tool. Observe and record the force required to remove the coating from the glass fibre. The
peak strip force is then recorded. Exclude data from fibres which break during the test. The
average of the sampling peak strip force values is then reported as "peak strip force".
7.2 Calculation of the reported value for a specimen
Calculate the average and standard deviation of the sampling.
– 10 – IEC 60793-1-32:2018 RLV © IEC 2018
8 Documentation
8.1 The following Information should to be presented
– test date;
– identification of the fibre tested including coating outer diameter and coating material type;
– average of strip force results (10 or more test pieces);
– method of calculation for a given piece: average or peak.
8.2 The following Information should to be available for each test
– identification and type of stripping tool used including manufacturer and nominal blade
hole size;
– strip rate;
– length of coating stripped;
– standard deviation or range of the pieces tested for a specimen of measured stripping
force per sampling;
– number of fibres that broke or were damaged before completely removing the coating;
– environmental conditions for preconditioning and during the test including temperature and
relative humidity;
– mention, if the coating residue is not readily removable as required in per 6.6.
9 Specification information
The detail specification shall specify the following information:
– failure or acceptance criteria;
– any deviations to the procedure that apply.
Bibliography
[1] Keqi Gan, Long Han, Kate M. Roberts, Bob J. Overton, Nelly Montaigne, "Optical Fiber
th
Strip Force Measurement Techniques and Their Implications", Proceedings of the 57
IWCS, Providence RI, November, 2008
[2] IEC 60793-2-10, Optical fibres – Part 2-10: Product specifications – Sectional
specification for category A1 multimode fibres
[3] IEC 60793-2-20, Optical fibres – Part 2-20: Product specifications – Sectional
specification for category A2 multimode fibres
[4] IEC 60793-2-30, Optical fibres – Part 2-30: Product specifications – Sectional
specification for category A3 multimode fibres
[5] IEC 60793-2-50, Optical fibres – Part 2-50: Product specifications – Sectional
specification for class B single-mode fibres
[6] IEC 60793-2-60, Optical fibres – Part 2-60: Product specifications – Sectional
specification for category C single-mode intraconnection fibres
___________
IEC 60793-1-32 ®
Edition 3.0 2018-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Optical fibres –
Part 1-32: Measurement methods and test procedures – Coating strippability
Fibres optiques –
Partie 1-32: Méthodes de mesure et procédures d’essai – Dénudabilité du
revêtement
– 2 – IEC 60793-1-32:2018 © IEC 2018
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Apparatus . 5
4.1 Tensile equipment. 5
4.2 Load cell . 6
4.3 Transducer amplifier . 6
4.4 Stripping tool . 6
4.5 Fibre guide . 7
5 Specimen preparation . 7
5.1 Representative sample . 7
5.2 Strip length . 7
6 Procedure . 8
6.1 General . 8
6.2 Stripping rate . 8
6.3 Preconditioning . 8
6.4 Calibrating the transducer amplifier . 8
6.5 Loading the test specimen . 8
6.6 Stripping the coating . 9
7 Calculations . 9
7.1 Calculation for the value of a specimen . 9
7.1.1 General . 9
7.1.2 Approach 1 – Average strip force . 9
7.1.3 Approach 2 – Peak strip force . 9
7.2 Calculation of the reported value. 9
8 Documentation . 9
8.1 Information to be presented . 9
8.2 Information to be available for each test. 10
9 Specification information . 10
Bibliography . 11
Figure 1 – Example of test arrangement . 6
Figure 2 – Length of fibre to be stripped . 8
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRES –
Part 1-32: Measurement methods and test procedures –
Coating strippability
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC
Publication(s)"). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60793-1-32 has been prepared by subcommittee 86A: Fibres and
cables, of IEC technical committee 86: Fibre optics.
This third edition cancels and replaces the second edition published in 2010. This edition
constitutes a technical revision.
This edition includes the following significant technical change with respect to the previous
edition: expansion of the range of coating dimensions applicable to the procedure detailed in
this document to accommodate optical fibres with a 200 µm coating dimension.
– 4 – IEC 60793-1-32:2018 © IEC 2018
The text of this International Standard is based on the following documents:
FDIS Report on voting
86A/1890/FDIS 86A/1899/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60793 series, published under the general title Optical fibres, can
be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
OPTICAL FIBRES –
Part 1-32: Measurement methods and test procedures –
Coating strippability
1 Scope
This part of IEC 60793 is intended primarily for testing either fibres as produced by a fibre
manufacturer or subsequently overcoated (tight buffered) using various polymers. The test
can be performed either on fibres as produced, or after exposure to various environments.
This test applies to A1, A2, A3, B and C fibres with a nominal glass dimension of 125 µm.
The object of this document is to establish uniform requirements for the mechanical
characteristic – coating strippability. This test quantifies the force required to mechanically
remove the protective coating from optical fibres along their longitudinal axis.
This test is not intended as a means to maximize fibre strength after the coating is removed
nor is it intended to specify the best conditions for field stripping of optical fibres.
This test is designed for optical fibres having polymeric coatings with nominal outer diameters
in the range of 200 µm to 900 µm.
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.
IEC 60793-1-1, Optical fibres – Part 1-1: Measurement methods and test procedures –
General and guidance
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Apparatus
4.1 Tensile equipment
Use a suitable device, for example a vertical tensile tester, which provides relative motion
between the test fibre and a stripping tool and is capable of imparting constant motion at the
velocity found in 6.2, without jerking the fibre under test or the stripping tool.
– 6 – IEC 60793-1-32:2018 © IEC 2018
Use a device capable of providing relative motion in two directions to allow resetting. Provide
suitable means for clamping and maintaining the stripping tool blades perpendicular to the
fibre axis or in a position that prevents fibre bending, and for securing one end of the test
fibre. To prevent fibre breakage, secure the fibre at the clamping point without stressing the
fibre excessively.
Examples of test arrangements are shown in Figure 1.
NOTE Either the stripping tool or the capstan is fixed.
Figure 1 – Example of test arrangement
4.2 Load cell
Use any appropriate device that is capable of sensing the force imparted to the fibre during
the removal of the fibre coating.
4.3 Transducer amplifier
This device receives signals from the load cell and indicates the tensile force on the test fibre
up to the point when the coating is stripped off. The transducer shall acquire the force data at
a rate greater than 100 Hz. The transducer and/or measurement system shall have the ability
to plot the test data on a continuous chart, such as a strip chart or line chart. It shall also have
the capability of capturing sufficient information to calculate the maximum and average forces,
along with the amplitude and frequencies of any oscillations in the force during the stripping
process.
The accuracy of the force measurement shall be stated in the detail specification.
4.4 Stripping tool
4.4.1 Because the results from this test are strongly dependent upon the design of tool
used, it is important that the following tool design guidelines be observed.
a) Unless otherwise specified in the detail specification, use tool blades with the diameter of
the hole greater than the nominal cladding diameter of the fibre to be stripped in order not
to damage the cladding surface. The recommended stripping tool should be constructed
such that the blades form a circular aperture. Other blade configurations may be used as
long as it can be shown that the results correlate to ones with a circular aperture [1] . A
practical example is a hole which is 15 µm larger that the nominal cladding diameter; for
125 µm cladding diameter fibres, this results in a 140 µm circular hole.
b) The stripping tool blades shall be constructed such that the blades do not cause fibre
bending. Stripping tools in which the blades butt together in the same plane are preferred
in this test.
4.4.2 Mount the stripping tool on the test fixture and provide a means to hold it closed
around the fibre using suitable clamps. Ensure the fibre is pulled in a direction normal to the
plane of the blades.
4.4.3 Replace the stripping tools at intervals as dictated by a documented quality
schedule, when the blades become dull or damaged, or whenever wear appears sufficient to
affect the test results.
NOTE Tool wear can affect any or all of the following:
• fibre breakage;
• the amount of residue left on the glass surface;
• the way in which the coating is removed from the fibre;
• the force required to remove the coatings.
4.5 Fibre guide
A fibre guide shall be provided to support the fibre that extends past the stripping tool blade
(if not already designed into the tool) and which meets the following requirements:
a) the guide shall support the fibre to prevent sagging due to the weight of the fibre;
b) the guide shall prevent bending of the fibre caused by buckling of the fibre coating as it is
removed;
c) the guide shall be located as close to the stripping tool as possible without interfering with
the stripping operation;
d) the guide shall allow for easy insertion into the test set-up and for easy cleaning, and shall
provide freedom from interference if the coating buckles.
5 Specimen preparation
5.1 Representative sample
The sampling shall consist of a minimum of 10 specimens assumed to be representative of
the population of fibres under evaluation. The specimens shall be tested and their results will
be averaged.
5.2 Strip length
The length of fibre stripped on a particular piece can affect the strip force. However, for
200 µm and 250 µm coating diameter fibres, the length of fibre stripped has minimal effect on
the strip force. The length of fibre stripped shall be specified in the detail specification. For
200 µm and 250 µm coating diameter fibres, a preferred value is 30 mm. For larger coating
diameter, shorter stripping lengths are preferred, for example 15 mm.
To perform the measurement, a specimen of fibre shall be provided that is longer than just the
specified length to be stripped. The total specimen length consists of the fibre required to
secure itself to the capstan, the fibre between the capstan and the stripping tool
(see Figure 1) and the fibre length to be stripped that extends past the stripping tool
(see Figure 2). The total specimen length shall be sufficiently long to meet this deployment.
___________
Numbers in square brackets refer to the Bibliography.
– 8 – IEC 60793-1-32:2018 © IEC 2018
The test results are not dependent on the total sample length. The test results are, in part,
dependent on the length of fibre to be stripped.
Figure 2 – Length of fibre to be stripped
6 Procedure
6.1 General
This procedure involves
a) severing the coating at the prescribed distance from the end of the fibre, and then
b) removing the coating from the fibre while measuring the force required to accomplish this
removal.
Use of protective eyewear is recommended as fibres can fracture while being stripped and
pierce skin and eyes.
6.2 Stripping rate
The
...
IEC 60793-1-32 ®
Edition 3.0 2018-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Optical fibres –
Part 1-32: Measurement methods and test procedures – Coating strippability
Fibres optiques –
Partie 1-32: Méthodes de mesure et procédures d’essai – Dénudabilité du
revêtement
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IEC 60793-1-32 ®
Edition 3.0 2018-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Optical fibres –
Part 1-32: Measurement methods and test procedures – Coating strippability
Fibres optiques –
Partie 1-32: Méthodes de mesure et procédures d’essai – Dénudabilité du
revêtement
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.10 ISBN 978-2-8322-6293-1
– 2 – IEC 60793-1-32:2018 © IEC 2018
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Apparatus . 5
4.1 Tensile equipment. 5
4.2 Load cell . 6
4.3 Transducer amplifier . 6
4.4 Stripping tool . 6
4.5 Fibre guide . 7
5 Specimen preparation . 7
5.1 Representative sample . 7
5.2 Strip length . 7
6 Procedure . 8
6.1 General . 8
6.2 Stripping rate . 8
6.3 Preconditioning . 8
6.4 Calibrating the transducer amplifier . 8
6.5 Loading the test specimen . 8
6.6 Stripping the coating . 9
7 Calculations . 9
7.1 Calculation for the value of a specimen . 9
7.1.1 General . 9
7.1.2 Approach 1 – Average strip force . 9
7.1.3 Approach 2 – Peak strip force . 9
7.2 Calculation of the reported value. 9
8 Documentation . 9
8.1 Information to be presented . 9
8.2 Information to be available for each test. 10
9 Specification information . 10
Bibliography . 11
Figure 1 – Example of test arrangement . 6
Figure 2 – Length of fibre to be stripped . 8
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRES –
Part 1-32: Measurement methods and test procedures –
Coating strippability
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC
Publication(s)"). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
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6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60793-1-32 has been prepared by subcommittee 86A: Fibres and
cables, of IEC technical committee 86: Fibre optics.
This third edition cancels and replaces the second edition published in 2010. This edition
constitutes a technical revision.
This edition includes the following significant technical change with respect to the previous
edition: expansion of the range of coating dimensions applicable to the procedure detailed in
this document to accommodate optical fibres with a 200 µm coating dimension.
– 4 – IEC 60793-1-32:2018 © IEC 2018
The text of this International Standard is based on the following documents:
FDIS Report on voting
86A/1890/FDIS 86A/1899/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60793 series, published under the general title Optical fibres, can
be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
OPTICAL FIBRES –
Part 1-32: Measurement methods and test procedures –
Coating strippability
1 Scope
This part of IEC 60793 is intended primarily for testing either fibres as produced by a fibre
manufacturer or subsequently overcoated (tight buffered) using various polymers. The test
can be performed either on fibres as produced, or after exposure to various environments.
This test applies to A1, A2, A3, B and C fibres with a nominal glass dimension of 125 µm.
The object of this document is to establish uniform requirements for the mechanical
characteristic – coating strippability. This test quantifies the force required to mechanically
remove the protective coating from optical fibres along their longitudinal axis.
This test is not intended as a means to maximize fibre strength after the coating is removed
nor is it intended to specify the best conditions for field stripping of optical fibres.
This test is designed for optical fibres having polymeric coatings with nominal outer diameters
in the range of 200 µm to 900 µm.
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.
IEC 60793-1-1, Optical fibres – Part 1-1: Measurement methods and test procedures –
General and guidance
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Apparatus
4.1 Tensile equipment
Use a suitable device, for example a vertical tensile tester, which provides relative motion
between the test fibre and a stripping tool and is capable of imparting constant motion at the
velocity found in 6.2, without jerking the fibre under test or the stripping tool.
– 6 – IEC 60793-1-32:2018 © IEC 2018
Use a device capable of providing relative motion in two directions to allow resetting. Provide
suitable means for clamping and maintaining the stripping tool blades perpendicular to the
fibre axis or in a position that prevents fibre bending, and for securing one end of the test
fibre. To prevent fibre breakage, secure the fibre at the clamping point without stressing the
fibre excessively.
Examples of test arrangements are shown in Figure 1.
NOTE Either the stripping tool or the capstan is fixed.
Figure 1 – Example of test arrangement
4.2 Load cell
Use any appropriate device that is capable of sensing the force imparted to the fibre during
the removal of the fibre coating.
4.3 Transducer amplifier
This device receives signals from the load cell and indicates the tensile force on the test fibre
up to the point when the coating is stripped off. The transducer shall acquire the force data at
a rate greater than 100 Hz. The transducer and/or measurement system shall have the ability
to plot the test data on a continuous chart, such as a strip chart or line chart. It shall also have
the capability of capturing sufficient information to calculate the maximum and average forces,
along with the amplitude and frequencies of any oscillations in the force during the stripping
process.
The accuracy of the force measurement shall be stated in the detail specification.
4.4 Stripping tool
4.4.1 Because the results from this test are strongly dependent upon the design of tool
used, it is important that the following tool design guidelines be observed.
a) Unless otherwise specified in the detail specification, use tool blades with the diameter of
the hole greater than the nominal cladding diameter of the fibre to be stripped in order not
to damage the cladding surface. The recommended stripping tool should be constructed
such that the blades form a circular aperture. Other blade configurations may be used as
long as it can be shown that the results correlate to ones with a circular aperture [1] . A
practical example is a hole which is 15 µm larger that the nominal cladding diameter; for
125 µm cladding diameter fibres, this results in a 140 µm circular hole.
b) The stripping tool blades shall be constructed such that the blades do not cause fibre
bending. Stripping tools in which the blades butt together in the same plane are preferred
in this test.
4.4.2 Mount the stripping tool on the test fixture and provide a means to hold it closed
around the fibre using suitable clamps. Ensure the fibre is pulled in a direction normal to the
plane of the blades.
4.4.3 Replace the stripping tools at intervals as dictated by a documented quality
schedule, when the blades become dull or damaged, or whenever wear appears sufficient to
affect the test results.
NOTE Tool wear can affect any or all of the following:
• fibre breakage;
• the amount of residue left on the glass surface;
• the way in which the coating is removed from the fibre;
• the force required to remove the coatings.
4.5 Fibre guide
A fibre guide shall be provided to support the fibre that extends past the stripping tool blade
(if not already designed into the tool) and which meets the following requirements:
a) the guide shall support the fibre to prevent sagging due to the weight of the fibre;
b) the guide shall prevent bending of the fibre caused by buckling of the fibre coating as it is
removed;
c) the guide shall be located as close to the stripping tool as possible without interfering with
the stripping operation;
d) the guide shall allow for easy insertion into the test set-up and for easy cleaning, and shall
provide freedom from interference if the coating buckles.
5 Specimen preparation
5.1 Representative sample
The sampling shall consist of a minimum of 10 specimens assumed to be representative of
the population of fibres under evaluation. The specimens shall be tested and their results will
be averaged.
5.2 Strip length
The length of fibre stripped on a particular piece can affect the strip force. However, for
200 µm and 250 µm coating diameter fibres, the length of fibre stripped has minimal effect on
the strip force. The length of fibre stripped shall be specified in the detail specification. For
200 µm and 250 µm coating diameter fibres, a preferred value is 30 mm. For larger coating
diameter, shorter stripping lengths are preferred, for example 15 mm.
To perform the measurement, a specimen of fibre shall be provided that is longer than just the
specified length to be stripped. The total specimen length consists of the fibre required to
secure itself to the capstan, the fibre between the capstan and the stripping tool
(see Figure 1) and the fibre length to be stripped that extends past the stripping tool
(see Figure 2). The total specimen length shall be sufficiently long to meet this deployment.
___________
Numbers in square brackets refer to the Bibliography.
– 8 – IEC 60793-1-32:2018 © IEC 2018
The test results are not dependent on the total sample length. The test results are, in part,
dependent on the length of fibre to be stripped.
Figure 2 – Length of fibre to be stripped
6 Procedure
6.1 General
This procedure involves
a) severing the coating at the prescribed distance from the end of the fibre, and then
b) removing the coating from the fibre while measuring the force required to accomplish this
removal.
Use of protective eyewear is recommended as fibres can fracture while being stripped and
pierce skin and eyes.
6.2 Stripping rate
The force required to remove coatings from fibre is dependent, in part, on the stripping rate. If
results of different tests are to be comparable, the same stripping rate shall be used. Set up
the test equipment so as to impart a relative motion between the fibre and the stripping tool at
the rate specified in the detail specification. A preferred value for 200 µm and 250 µm coating
diameter is 500 mm/min. For fibres with larger coating diameter, a lower value is preferred, for
example 10 mm/min to 25 mm/min.
6.3 Preconditioning
Unless otherwise specified, pre-condition the test samples for a minimum of 2 h at the
standard test conditions given in IEC 60793-1-1.
6.4 Calibrating the transducer amplifier
Calibrate the transducer and load cell before each series of tests or as dictated by a
documented calibration schedule.
6.5 Loading the test specimen
Ensure the area around both blades of the stripping tool is free of debris and/or build-up from
any previous use before loading the fibre.
Secure one end of the test fibre to the test fixture so that it will not slip under load (e.g. wrap
one end of the fibre three times around an 80-mm diameter capstan). Thread the other end
through the stripping tool and insert it through the fibre guide/support.
6.6 Stripping the coating
Start the test apparatus to provide a constant relative motion between the fibre and the
stripping tool.
Observe and record the force required to remove the coating from the glass fibre. Exclude
data from fibres that break during the test.
The test is complete when the coating has been completely removed from the fibre.
Any remaining coating residue visible to the naked eye shall be easy to remove by gently
wiping the fibre with a laboratory tissue.
7 Calculations
7.1 Calculation for the value of a specimen
7.1.1 General
There are two approaches to measuring strip force. Both incorporate the same experimental
technique but each emphasizes a different focal point for the strip force.
7.1.2 Approach 1 – Average strip force
Start the test apparatus to provide a constant relative motion between fibre and stripping tool.
Observe and record the force required to remove the coating from the glass fibre. Exclude
data from fibres that break during the test. The average strip force is then calculated,
excluding the initial 20 % of the strip length data. The average of the sampling strip force
values is then reported as "average strip force".
7.1.3 Approach 2 – Peak strip force
Start the test apparatus to provide a constant relative motion between the fibre and stripping
tool. Observe and record the force required to remove the coating from the glass fibre. The
peak strip force is then recorded. Exclude data from fibres which break during the test. The
average of the sampling peak strip force values is then reported as "peak strip force".
7.2 Calculation of the reported value
Calculate the average and standard deviation of the sampling.
8 Documentation
8.1 Information to be presented
– test date;
– identification of the fibre tested including coating outer diameter and coating material type;
– average of strip force results (10 or more test pieces);
– method of calculation for a given piece: average or peak.
– 10 – IEC 60793-1-32:2018 © IEC 2018
8.2 Information to be
...
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