EN ISO 13468-1:1996

SLOVENSKI STANDARD
01-maj-1999
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Plastics - Determination of total luminous transmittance of transparent materials - Part 1:
Single-beam instrument (ISO 13468-1:1996)
Kunststoffe - Bestimmung des totalen Lichttransmissionsgrades von transparenten
Materialien - Teil 1: Einstrahlinstrument (ISO 13468-1:1996)
Plastiques - Détermination du facteur de transmission du flux lumineux total des
matériaux transparents - Partie 1: Instrument a faisceau unique (ISO 13468-1:1996)
Ta slovenski standard je istoveten z: EN ISO 13468-1:1996
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL ISO
STANDARD
First edition
1996-08-15
- Determination of the total
Plastics
luminous transmittance of transparent
materials -
Part 1:
Single-beam instrument
Plas tiques - Determination du facteur de transmission du flux lumineux
total des ma tbriaux transparents -
Partie 7: lnstrumen t 2 faisceau unique
Reference number
ISO 13468-17 996(E)
ISO 13468=1:1996(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. Esch 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.
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 13468-1 was prepared by Technical Committee
lSO/TC 61, Plastics, Subcommittee SC 11, Products.
ISO 13468 consists of the following Parts, under the general title
- Determination of the total luminous transmittance of trans-
Plas tics
paren t ma terials:
- Part 7: Single-beam instrument
- Part 2: Double-beam instrumen t
Annex A of this part of ISO 13468 is for information only.
0 ISO 1996
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronie or mechanical, including photocopying and
microfilm, without Permission in writing from the publisher.
International
Organization for Standardization
Case Postale 56 l CH-121 1 Geneve 20 l Swi tzerland
Printed in Switzerland
ISO 13468=1:1996(E)
INTERNATIONAL STANDARD 0 ISO
Plastics - Determination of the total luminous
transmittance of transparent materials -
Part 1:
Single-beam instrument
on this part of ISO 13468 are encouraged to investi-
1 Scope
gate the possibility of applying the most recent edi-
tions of the Standards indicated below. Members of
This part of ISO 13468 covers the determination of
IEC and ISO maintain registers of currently valid
the total luminous transmittance, in the visible region
International Standards.
of the spectrum, of planar transparent and substan-
tially colourless plastics, using a Single-beam photo-
ISO 291 :1977, Plastics - Standard atmospheres for
meter with a specified CIE Standard light Source and
conditioning and testing.
photodetector. This part of ISO 13468 cannot be used
for plastics which contain fluorescent materials.
ISO 5725-1: 1994, Accuracy (trueness and precision)
of measurement methods and results - Part 7:
This part of ISO 13468 is applicable to transparent
General principles and definitions.
moulding materials, films and sheets not exceeding
IO mm in thickness.
ISO 5725-2: 1994, Accuracy (trueness and precision)
NOTES
of measurement methods and results - Part 2: Basic
method for the determination of repeatability and
1 Total luminous transmittance tan also be determined by
reproducibility of a Standard measurement method.
a double-beam spectrophotometer as in part 2 of the stan-
dard. Part 1, however, provides a simple but precise, prac-
ISO 5725-3: 1994, Accuracy (trueness and precision)
tical and quick determination. This method is suitable for
of measurement methods and results - Part 3:
use not only for analytical purposes but also for quality
Intermedia te measures of the precision of a s tandard
control.
measurement method.
2 Substantially colourless plastics include those which are
faintly tinted.
ISO 7724-2:1984, Paints and varnishes - Colorimetry
- Part 2: Colour measurement.
3 Spetimens more than 10 mm thick may be measured
provided the instrument tan accommodate them, but the
lSO/CIE 10526:1991, CIE Standard color;metric
results may not be comparable with those obtained using
illuminan ts.
specimens less than 10 mm thick.
lSO/CIE 10527:1991, Cl E s tandard colorime tric
observers.
2 Normative references
CIE Publication No. * 7.4: 1987, CIE International Iight-
The following Standards contain provisions which,
ing vocabulary [also published as 1 EC 50(845): 1987,
through reference in this text, constitute provisions
International electro
echnical vocabulary - Chap ter
of this part of ISO 13468. At the time of publication,
845: Ligh ting] .
the editions indicated were valid. All Standards are
subject to revision, and Parties to agreements based

0 ISO
ISO 13468=1:1996(E)
4.2 The light Source and/or photodetector shall be
3 Definitions
fitted with filters so that the output of the combined
For the purposes of this part of ISO 13468, the defi- System corresponds to the CIE Standard colorimetric
nitions given in CIE Publication No. 17.4 for trans- observer as specified in lSO/CIE 10527 and CIE stan-
paren t medium, transmittance, regular transmittance dard illuminant D,, as specified in lSO/CIE 10526. The
and luminous flux apply, together with the following: output of the photodectector shall be proportional, to
within 1 %, to the incident flux over the flux range
used. The spectrophotometric characteristics of the
3.1 transparent plastics: Plastics in which the
light Source and the photodetector shall be kept con-
transmission of light is essentially regular and which
stant during measurements on specimens. The
have a high transmittance in the visible region of the
measurement conditions shall be such that the
spectrum.
specimen temperature does not increase while
NOTE 4 Provided their geometrical shape is suitable, ob-
measurements are made.
jects will be seen distinctly through plastic which is trans-
parent in the visible region.
4.3 The light Source shall be combined with an op-
tical System to produce a parallel beam of light; the
3.2 total luminous transmittance: The ratio of the
angle which any ray of this beam makes with the axis
transmitted luminous flux to the incident luminous
of the beam shall not exceed 0,087 rad (SO). The beam
flux when a parallel beam of light Passes through a
shall not be vignetted at either port of the sphere.
specrmen.
The diameter of the beam shall be 0,5 to 0,8 times
the diameter of the entrance port of the integrating
sphere.
4 Apparatus
4.4 Using this instrument, the repeatability Standard
deviation shall be 0,2 % or less. The within-laboratory
4.1 The apparatus shall consist of a stabilized light
reproducibility over long time intervals shall not ex-
Source, an associated Optical System, an integrating
ceed the repeatability by a factor of more than 3.
sphere fitted with ports, and a Photometer. lngress
of external light into the integrating sphere shall be
prevented. A schematic arrangement of the apparatus 4.5 The design of the instrument shall be such that
is shown in figure 1. it reads zero when the incident flux is Zero.
Integrating sphere
Photodetector
Baffle
7 \
Collimator tube Specimen holder
J
Entrance port Compensation port
Light trap
Figure 1 -
Schematic arrangement of the apparatus

0 ISO ISO 13468=1:1996(E)
of the holder. The latter method is used for thicker speci-
4.6 The integrating sphere used to collect the
mens, which cannot be mounted in the double-ring-type
transmitted flux may be of any diameter as long as
holder.
the total port area does not exceed 3,0 % of the
internal area of the sphere.
5 Test sp
...