ISO 1888:2022

INTERNATIONAL ISO
STANDARD 1888
Fourth edition
2022-01
Textile glass — Staple fibres or
filaments — Determination of average
diameter
Verre textile — Fibres discontinues et filaments — Détermination du
diamètre moyen
Reference number
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Method A: Longitudinal profile .1
4.1 Principle . 1
4.2 Apparatus . 1
4.3 Procedure . 2
5 Method B: Transverse section . 3
5.1 Principle . 3
5.2 Apparatus . 3
5.3 Procedure . 4
6 Method C: Determination of the diameter by calculation . 5
6.1 Principle . 5
6.2 Test specimen . 5
6.3 Procedure . 6
7 Expression of results . 6
8 Test report . 6
iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO’s adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 13,
Composites and reinforcement fibres.
This fourth edition cancels and replaces the third edition (ISO 1888:2006), which has been technically
revised.
The main changes are as follows:
— “Method C” (determination of the diameter by calculation) has been added.
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 1888:2022(E)
Textile glass — Staple fibres or filaments — Determination
of average diameter
1 Scope
This document specifies three test methods used for determining the average diameter (i.e. the average
value of actual diameters) of staple fibres or filaments in a textile glass product.
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 472, Plastics — Vocabulary
ISO 1889, Reinforcement yarns — Determination of linear density
ISO 12154, Determination of density by volumetric displacement — Skeleton density by gas pycnometry
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 472 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/
4 Method A: Longitudinal profile
4.1 Principle
Fibres or filaments placed in a liquid medium having a refractive index differing from that of the textile
glass are viewed in profile under a microscope and the diameter measured.
4.2 Apparatus
4.2.1 Microscope, equipped with the following:
— An eye-piece with a built-in micrometer graticule, the eye-piece and objective together giving an
overall magnification of at least ×400 and preferably ×1 000. The resolution of the microscope shall
permit measurement to the nearest 0,5 µm or better.
— A system permitting lateral and rotational movement of the microscope stage.
— An illumination system.
This sys
...