EN ISO 13468-2:2006

SLOVENSKI STANDARD
01-julij-2006
Polimerni materiali - Ugotavljanje celotne prepustnosti svetlobe prozornih
materialov – 2. del: Instrument z dvojnim žarkom (ISO 13468-2:1999)
Plastics - Determination of the total luminous transmittance of transparent materials -
Part 2: Double-beam instrument (ISO 13468-2:1999)
Kunststoffe - Bestimmung des totalen Lichttransmissionsgrades von transparenten
Materialien - Teil 2: Zweistrahlinstrument (ISO 13468-2:1999)
Plastiques - Détermination du facteur de transmission du flux lumineux total des
matériaux transparents - Partie 2: Instrument a double faisceau (ISO 13468-2:1999)
Ta slovenski standard je istoveten z: EN ISO 13468-2:2006
ICS:
83.080.01
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 13468-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2006
ICS 83.080.01
English Version
Plastics - Determination of the total luminous transmittance of
transparent materials - Part 2: Double-beam instrument (ISO
13468-2:1999)
Plastiques - Détermination du facteur de transmission du Kunststoffe - Bestimmung des totalen
flux lumineux total des matériaux transparents - Partie 2: Lichttransmissionsgrades von transparenten Materialien -
Instrument à double faisceau (ISO 13468-2:1999) Teil 2: Zweistrahlinstrument (ISO 13468-2:1999)
This European Standard was approved by CEN on 16 March 2006.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,
Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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EUROPÄISCHES KOMITEE FÜR NORMUNG
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© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 13468-2:2006: E
worldwide for CEN national Members.

Foreword
The text of ISO 13468-2:1999 has been prepared by Technical Committee ISO/TC 61 "Plastics”
of the International Organization for Standardization (ISO) and has been taken over as EN ISO
13468-2:2006 by Technical Committee CEN/TC 249 "Plastics", the secretariat of which is held
by IBN.
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 October 2006, and conflicting national
standards shall be withdrawn at the latest by October 2006.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

Endorsement notice
The text of ISO 13468-2:1999 has been approved by CEN as EN ISO 13468-2:2006 without any
modifications.
INTERNATIONAL ISO
STANDARD 13468-2
First edition
1999-05-01
Plastics — Determination of the total
luminous transmittance of transparent
materials —
Part 2:
Double-beam instrument
Plastiques — Détermination du facteur de transmission du flux lumineux
total des matériaux transparents —
Partie 2: Instrument à double faisceau
A
Reference number
ISO 13468-2:1999(E)
ISO 13468-2:1999(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
International Standard ISO 13468-2 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee
SC 5, Physical-chemical properties.
ISO 13468 consists of the following parts, under the general title Plastics — Determination of the total luminous
transmittance of transparent materials:
 Part 1: Single-beam instrument
 Part 2: Double-beam instrument
©  ISO 1999
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet iso@iso.ch
Printed in Switzerland
ii
©
INTERNATIONAL STANDARD  ISO ISO 13468-2:1999(E)
Plastics — Determination of the total luminous transmittance
of transparent materials —
Part 2:
Double-beam instrument
1 Scope
This part of ISO 13468 covers the determination of the total luminous transmittance, in the visible region of the
spectrum, of planar transparent and substantially colourless plastics, using a double-beam scanning spectro-
photometer. This part of ISO 13468 cannot be used for plastics which contain fluorescent materials.
This part of ISO 13468 is applicable to transparent moulding materials, films and sheets not exceeding 10 mm in
thickness.
NOTE 1 Total luminous transmittance can also be determined by a single-beam instrument as in part 1 of this International
Standard.
NOTE 2 Substantially colourless plastics include those which are faintly tinted.
NOTE 3 Specimens more than 10 mm thick may be measured provided the instrument can accommodate them, but the
results may not be comparable with those obtained using specimens less than 10 mm thick.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this part of ISO 13468. For dated references, subsequent amendments to, or revisions of, any of these publications
do not apply. However, parties to agreements based on this part of ISO 13468 are encouraged to investigate the
possibility of applying the most recent editions of the normative documents indicated below. For undated
references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain
registers of currently valid International Standards.
ISO 291:1997, Plastics — Standard atmospheres for conditioning and testing.
ISO 5725-1:1994, Accuracy (trueness and precision) of measurement methods and results — Part 1: General
principles and definitions.
ISO 5725-2:1994, 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 5725-3:1994, Accuracy (trueness and precision) of measurement methods and results — Part 3: Intermediate
measures of the precision of a standard measurement method.
ISO/CIE 10526:1999, CIE standard illuminants for colorimetry.
ISO/CIE 10527:1991, CIE standard colorimetric observers.
©
ISO
ISO 13468-2:1999(E)
CIE Publication No. 15.2:1986, Colorimetry.
CIE Publication No. 17.4:1987, International lighting vocabulary [also published as IEC 50(845):1987, International
electrotechnical vocabulary — Chapter 845: Lighting].
3 Terms and definitions
For the purposes of this part of ISO 13468, the terms and definitions given in CIE Publication No. 17.4 for
"transparent medium", "transmittance", "regular transmittance", "radiant flux" and "luminous flux" apply, together
with the following:
3.1
transparent plastics
plastics in which the transmission of light is essentially regular and which have a high transmittance in the visible
region of the spectrum
NOTE Provided their geometrical shape is suitable, objects will be seen distinctly through plastic which is transparent in
the visible region.
3.2
total spectral transmittance
the ratio of the transmitted radiant flux (regular and di
...