prEN ISO 489

Plastics - Determination of refractive index (ISO/DIS 489:2021)

Kunststoffe - Bestimmung des Brechungsindex (ISO/DIS 489:2021)

Dieses Dokument legt zwei Verfahren zur Bestimmung des Brechungsindex von Kunststoffen fest:
- Verfahren A: Refraktometerverfahren zur Messung des Brechungsindex von Formteilen, gegossenen oder stranggepressten Tafeln oder Folien mit einem Refraktometer. Dieses Verfahren gilt nicht nur für isotrope durchsichtige, durchscheinende, gefärbte oder undurchsichtige, sondern auch für anisotrope Materialien.
- Verfahren B: Immersionsverfahren (unter Ausnutzung des Becke-Linien-Phänomens) zur Bestimmung des Brechungsindex von pulverförmigen oder granulierten durchsichtigen Materialien unter Anwendung eines Mikroskops. Im Allgemeinen sollte monochromatisches Licht verwendet werden, um Dispersionseffekte zu vermeiden.
ANMERKUNG 1 Der Brechungsindex ist eine grundlegende Eigenschaft, die zur Überprüfung der Reinheit und der Zusammensetzung, zur Identifizierung von Werkstoffen und zur Bemessung optischer Teile verwendet werden kann. Aus der Änderung des Brechungsindex mit der Temperatur kann der Übergangspunkt der Werkstoffe ermittelt werden.
ANMERKUNG 2 Die Messgenauigkeit des Verfahrens B entspricht unter der Voraussetzung, dass ein erfahrener Prüfer das Verfahren sehr sorgfältig anwendet, etwa der Messgenauigkeit des Verfahrens A (siehe Abschnitt 8).

Plastiques - Détermination de l’indice de réfraction (ISO/DIS 489:2021)

Polimerni materiali - Določanje lomnega količnika (ISO/DIS 489:2021)

General Information

• Status: Not Published
• ICS: 83.080.01 - Plastics in general
• Technical Committee: CEN/TC 249 - Plastics
• Current Stage: 4599 - Dispatch of FV draft to CMC - Finalization for Vote
• Due Date: 20-Oct-2021
• Completion Date: 20-Oct-2021
• Ref Project: oSIST prEN ISO 489:2021 - Plastics - Determination of refractive index (ISO/DIS 489:2021)

RELATIONS

• Revised: EN ISO 489:1999 - Plastics - Determination of refractive index (ISO 489:1999)
• Effective Date: 07-Oct-2020

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN ISO 489:2021
01-april-2021
Polimerni materiali - Določanje lomnega količnika (ISO/DIS 489:2021)
Plastics - Determination of refractive index (ISO/DIS 489:2021)
Kunststoffe - Bestimmung des Brechungsindex (ISO/DIS 489:2021)
Plastiques - Détermination de l’indice de réfraction (ISO/DIS 489:2021)
Ta slovenski standard je istoveten z: prEN ISO 489
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
oSIST prEN ISO 489:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 489:2021
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oSIST prEN ISO 489:2021
DRAFT INTERNATIONAL STANDARD
ISO/DIS 489
ISO/TC 61/SC 5 Secretariat: DIN
Voting begins on: Voting terminates on:
2021-02-01 2021-04-26
Plastics — Determination of refractive index
Plastiques — Détermination de l'indice de réfraction
ICS: 83.080.01
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 489:2021(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. ISO 2021
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oSIST prEN ISO 489:2021
ISO/DIS 489:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

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
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Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
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oSIST prEN ISO 489:2021
ISO/DIS 489:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Apparatus and materials.............................................................................................................................................................................. 2

4.1 Method A ...................................................................................................................................................................................................... 2

4.2 Method B ...................................................................................................................................................................................................... 3

5 Preparation of test specimens ................................................................................................................................................................ 3

5.1 Method A ...................................................................................................................................................................................................... 3

5.2 Method B ...................................................................................................................................................................................................... 4

5.3 Required number of specimens or measurements.................................................................................................. 4

6 Conditioning .............................................................................................................................................................................................................. 4

7 Procedure..................................................................................................................................................................................................................... 4

7.1 Method A ...................................................................................................................................................................................................... 4

7.1.1 General...................................................................................................................................................................................... 4

7.1.2 Transparent sheet ........................................................................................................................................................... 4

7.1.3 Film .............................................................................................................................................................................................. 6

7.1.4 Anisotropic material ..................................................................................................................................................... 7

7.1.5 Translucent, coloured and opaque material ............................................................................................ 8

7.2 Method B ...................................................................................................................................................................................................... 8

8 Precision ....................................................................................................................................................................................................................... 9

9 Test report ................................................................................................................................................................................................................11

© ISO 2021 – All rights reserved iii
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oSIST prEN ISO 489:2021
ISO/DIS 489:2021(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/

iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 5, Physical-

chemical properties.

This third edition cancels and replaces the second edition (ISO 489:1999), which has been technically

revised.
The main changes compared to the previous edition are as follows:

— delete the description about the precision of the explanation of the method A and method B in

the scope.
— delete the published date of the reference documents
— change the definition of the temperature control device of method A
— As the report items, added the type of the immersing liquid used in method B
— document has been editorial revised.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2021 – All rights reserved
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oSIST prEN ISO 489:2021
DRAFT INTERNATIONAL STANDARD ISO/DIS 489:2021(E)
Plastics — Determination of refractive index
1 Scope

This document specifies two test methods for determining the refractive index of plastics, namely:

— Method A: a refractometric method for measuring the refractive index of moulded parts, cast or

extruded sheet or film, by means of a refractometer. It is applicable not only to isotropic transparent,

translucent, coloured or opaque materials but also to anisotropic materials.

— Method B: an immersion method (making use of the Becke line phenomenon) for determining

the refractive index of powdered or granulated transparent materials by means of a microscope.

Monochromatic light should, in general, be used to avoid dispersion effects.

NOTE 1 The refractive index is a fundamental property which can be used for checking purity and

composition, for the identification of materials and for the design of optical parts. The change in refractive index

with temperature can give an indication of transition points of materials.

NOTE 2 The accuracy of method B is approximately the same as that of method A when an experienced

operator uses the method with extreme care (see Clause 8).
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 291, Plastics — Standard atmospheres for conditioning and testing

ISO 5725-1, Accuracy (trueness and precision) of measurement methods and results — Part 1: General

principles and definitions

ISO 5725-2, Accuracy (trueness and precision) of measurement methods and results — Part 2: Basic method

for the determination of repeatability and reproducibility of a standard measurement method

ISO 5725-3, Accuracy (trueness and precision) of measurement methods and results — Part 3: Intermediate

measures of the precision of a standard measurement method
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:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
© ISO 2021 – All rights reserved 1
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oSIST prEN ISO 489:2021
ISO/DIS 489:2021(E)
4 Apparatus and materials
4.1 Method A

4.1.1 Abbe refractometer, or any other refractometer that can be shown to give the same results,

reading precision to 0,001 and capable of measuring the refractive index in the range from 1,300 to

1,700. A temperature-controlling device (4.1.4) shall be provided for the specimens and prisms.

4.1.2 White or sodium lamp, used as a source of light.
4.1.3 Contacting liquid.

WARNING — The contacting liquid may present an environmental hazard during handling,

storage and disposal. Verify its toxicity and follow national and regional regulations for safe

handling and disposal.

The contacting liquid shall have a refractive index higher than that of the material to be examined and

shall not soften, attack or dissolve the plastic material. The liquids listed in Table 1 may be used for the

respective plastic materials, but other liquids meeting these requirements may also be used.

Table 1 — Contacting liquids
Plastic material Contacting liquid
Cellulose derivatives Aniseed oil or 1-bromonaphthalene
Fluorine-containing polymers 1-Bromonaphthalene
Urea-formaldehyde Aniseed oil or 1-bromonaphthalene
Phenol-formaldehyde 1-Bromonaphthalene
Polyethylenes 1-Bromonaphthalene
Polyamides 1-Bromonaphthalene
Unsaturated polyester 1-Bromonaphthalene
Polyisobutylene Saturated aqueous solution of zinc chloride made slightly acid

Poly(methyl methacrylate) Saturated aqueous solution of zinc chloride made slightly acid or

1-bromonaphthalene
Polystyrene Saturated potassium mercury(II) iodide solution
Styrene-acrylonitrile copolymers 1-Bromonaphthalene
Vinyl resins (vinyl chloride copolymer or 1-Bromonaphthalene
plasticized PVC)
Poly(vinyl chloride) 1-Bromonaphthalene
Poly(ethylene terephthalate) Methylene iodide
Polycarbonate Methylene iodide

Diethylene glycol bis(allyl carbonate) (CR 39) Methyl salicylate, aniseed oil or 1-bromonaphthalene

Polyarylate Saturated aqueous solution of zinc chloride made slightly acid, meth-

ylene iodide or 1-bromonaphthalene
Polyetheretherketone Methylene iodide
Polypropylene 1-Bromonaphthalene

4.1.4 Temperature control system, capable maintaining the temperature of the main prism, sub-

prism and specimen at (23 ± 0.5) °C.
2 © ISO 2021 – All rights reserved
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oSIST prEN ISO 489:2021
ISO/DIS 489:2021(E)
4.2 Method B

4.2.1 Microscope, having a magnifying power of at least × 200, an objective giving approximately

× 20 of primary magnification and a substage condenser fitted with a centering illuminating-aperture

diaphragm capable of being stopped down to give a very narrow axial beam.

4.2.2 Monochromatic light, usually the sodium D line, having a wavelength of 589 nm, is used as

the light source for the microscope.
4.2.3 Immersion liquids, with different refractive indices.
WARNING — The contacting liquid may prese
...