EN ISO 137:2015

SLOVENSKI STANDARD
01-marec-2016
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Wool - Determination of fibre diameter - Projection microscope method (ISO 137:2015)
Wolle - Bestimmung des Faserdurchmessers - Mikroskop- Projektionsverfahren (ISO
137:2015)
Laine - Détermination du diamètre des fibres - Méthode du microscope à projection (ISO
137:2015)
Ta slovenski standard je istoveten z: EN ISO 137:2015
ICS:
59.060.10 Naravna vlakna Natural fibres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 137
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2015
EUROPÄISCHE NORM
ICS 59.060.10
English Version
Wool - Determination of fibre diameter - Projection
microscope method (ISO 137:2015)
Laine - Détermination du diamètre des fibres - Wolle - Bestimmung des Faserdurchmessers -
Méthode du microscope à projection (ISO 137:2015) Mikroskop-Projektionsverfahren (ISO 137:2015)
This European Standard was approved by CEN on 26 September 2015.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 137:2015 E
worldwide for CEN national Members.

Contents Page
Euroepean foreword . 3
Euroepean foreword
This document (EN ISO 137:2015) has been prepared by Technical Committee ISO/TC 38 "Textiles" in
collaboration with Technical Committee CEN/TC 248 “Textiles and textile products” the secretariat of
which is held by BSI.
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 June 2016, and conflicting national standards shall be
withdrawn at the latest by June 2016.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
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, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 137:2015 has been approved by CEN as EN ISO 137:2015 without any modification.
INTERNATIONAL ISO
STANDARD 137
Second edition
2015-12-01
Wool — Determination of fibre
diameter — Projection microscope
method
Laine — Détermination du diamètre des fibres — Méthode du
microscope à projection
Reference number
ISO 137:2015(E)
©
ISO 2015
ISO 137:2015(E)
© ISO 2015, Published in Switzerland
All rights reserved. Unless otherwise specified, 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.
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ii © ISO 2015 – All rights reserved

ISO 137:2015(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3  Terms and definitions . 1
4 Principle . 1
5 Apparatus . 2
6 Sampling and preparation of the test specimens . 5
6.1 Raw wool . 5
6.2 Slivers, rovings and yarns . 5
6.3 Cutting of snippets . 5
6.3.1 Using a fibre holder and pusher . 5
6.3.2 Using a microtome. 5
6.4 Mounting of test specimen . 5
7 Test procedure . 6
7.1 General . 6
7.2 Examination of the test specimen . 6
7.3 Focusing . 7
7.4 Measuring the width of a fibre image. 7
7.5 Recording of measurements. 8
8 Measurement procedure . 8
9 Calculation and expression of results . 8
10 Test report . 9
Annex A (informative) Example of calculation .10
Annex B (informative) Accuracy of results and confidence limits for mean .12
Bibliography .13
ISO 137:2015(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 on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 38, Textiles, Subcommittee SC 23, Fibres and yarns.
This second edition cancels and replaces the first edition (ISO 137:1975), which has been technically
revised.
This second edition to ISO 137 is based on the test method IWTO-8:2011, drawn up by the International
Wool Textile Organization (IWTO).
iv © ISO 2015 – All rights reserved

INTERNATIONAL STANDARD ISO 137:2015(E)
Wool — Determination of fibre diameter — Projection
microscope method
1 Scope
This International Standard specifies the procedure and the measurement conditions for the
determination of the wool fibre diameter using a projection microscope.
The method is suitable for wool fibres in any form and also for other fibres of reasonably circular cross-
section. (In the case of dyed, bleached or finished fibres, the diameter might be different from that of
fibres not subjected to such treatments. The estimates of fibre diameter obtained at the various stages
of processing one lot of wool will not necessarily be the same.)
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 139, Textiles — Standard atmospheres for conditioning and testing
ISO 1130:1975, Textile fibres — Some methods of sampling for testing
3  Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
mean diameter
average value of the projected width of either the wool fibre or another fibre of reasonably circular
cross-section
3.2
total sample
sample intended to be representative of a large bulk of material, in the state in which it is sent to
the laboratory
Note 1 to entry: The total sample is prepared according to the procedure specified in ISO 1130.
3.3
subsample
sample randomly drawn from and representative of the total sample, which has been suitably cleaned,
dried and conditioned where appropriate
3.4
test specimen
part of a subsample which is tested at one time
4 Principle
Projection on a screen of the magnified images of the profiles of wool fibre snippets, and measurement
of their width by means of a graduated scale. The operating technique ensures a random sampling of
the fibres to be measured.
ISO 137:2015(E)
5 Apparatus
5.1 Projection microscope, comprising a light source, a light condenser, a stage which supports the
slide carrying the fibres, an objective, an ocular and a circular screen.
5.1.1 Stage, movable in two directions at right angles by means of a sliding mechanism capable of
successive displacements in 1,0 mm steps.
5.1.2  Objective and ocular, capable of providing 500X magnification.
5.1.3 Circular screen, equipped with a graduated scale capable of measuring the projected image of
the fibre snippet on the screen in any orientation and position within the measuring area.
It is acceptable to mark a central circle having a diameter equal to one-quarter of the optical distance
between the ocular and the centre of the screen. To ensure that any lens aberrations at the objective
perimeter are avoided, all measurements must be made within this circle. However, some modern
instruments contain much improved optics which ensure uniformity of magnification over the whole
of the projected image. In the case of these instruments, no marked circle is needed and measurements
can be made over the whole image area. In all cases where there is no marked circle on the screen, to
ensure the integrity of the instrument’s optics
...