ISO 14782:2021

Plastics — Determination of haze for transparent materials

This document specifies a method for the measurement of haze, an optical property resulting from wide-angle scattering of light, in transparent and substantially colourless plastics. This method is applicable to the measurement of haze values of less than 40 %. NOTE The haze of abraded or matted transparent plastics can be measured, but the value obtained can be erroneously lower than the true value due to light scattering within a narrow angle.

Plastiques — Détermination du trouble des matériaux transparents

General Information

• Status: Published
• Publication Date: 13-Oct-2021
• ICS: 83.080.01 - Plastics in general
• Technical Committee: ISO/TC 61/SC 5 - Physical-chemical properties
• Drafting Committee: ISO/TC 61/SC 5/WG 11 - Analytical methods
• Current Stage: 6060 - International Standard published
• Start Date: 14-Oct-2021
• Due Date: 22-Sep-2022
• Completion Date: 14-Oct-2021

Relations

• Revises: ISO 14782:1999 - Plastics — Determination of haze for transparent materials
• Effective Date: 12-Dec-2020

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 14782
Second edition
2021-10
Plastics — Determination of haze for
transparent materials
Plastiques — Détermination du trouble des matériaux transparents
Reference number
ISO 14782:2021(E)
© ISO 2021

---------------------- Page: 1 ----------------------
ISO 14782:2021(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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
  © ISO 2021 – All rights reserved

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ISO 14782:2021(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 2
6 Specimens. 3
7 Conditioning . 4
8 Procedure .4
9 Expression of results . 4
10 Precision . 5
11 Test report . 6
Bibliography . 7
iii
© ISO 2021 – All rights reserved

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ISO 14782:2021(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 second edition cancels and replaces the first edition (ISO 14782:1999), which has been technically
revised. It also incorporates the Technical Corrigendum ISO 14782:1999/Cor 1:2005.
The main changes compared to the previous edition are as follows:
— Formula (1) in Clause 9 has been corrected;
— the document has been editorially 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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INTERNATIONAL STANDARD ISO 14782:2021(E)
Plastics — Determination of haze for transparent materials
1 Scope
This document specifies a method for the measurement of haze, an optical property resulting from
wide-angle scattering of light, in transparent and substantially colourless plastics. This method is
applicable to the measurement of haze values of less than 40 %.
NOTE The haze of abraded or matted transparent plastics can be measured, but the value obtained can be
erroneously lower than the true value due to light scattering within a narrow angle.
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 291, Plastics — Standard atmospheres for conditioning and testing
ISO/CIE 11664-1, Colorimetry — Part 1: CIE standard colorimetric observers
ISO 11664-2, Colorimetry — Part 2: CIE standard illuminants
ISO 13468-1, Plastics — Determination of the total luminous transmittance of transparent materials —
Part 1: Single-beam instrument
CIE Publication No. 15, Colorimetry
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 472 and ISO 13468-1 apply.
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 https:// www .electropedia .org/
4 Principle
Haze is determined using an integrating sphere the efficiency of which is held constant by compensation.
1
© ISO 2021 – All rights reserved

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ISO 14782:2021(E)
5 Apparatus
5.1 The apparatus shall consist of a stabilized light source, an associated optical system, an
integrating sphere with ports, and a photometer comprising a photodetector, signal processor and
display unit or recorder (see Figure 1).
Key
1 lamp 6 exit port
2 lens 7 entrance port
3 baffle 8 integrating sphere
4 photodetector 9 compensation port
5 light trap 10 specimen holder
Figure 1 — Schematic arrangement of the apparatus
5.2 The light source and the photometer shall be used in conjunction with a filter to provide an output
corresponding to the photopic standard luminous efficiency Vë() (as defined in ISO/CIE 11664-1),
which is identical to the colour-matching function yë specified in ISO/CIE 11664-1 under CIE standard
()
illuminant D as specified in ISO 11664-2. The output of the photodetector shall be proportional to
65
the incident flux, to within 1 % of the incident flux, over the range used.
The spectral and photometric characteristics of the light source and photometer shall be kept constant
during measurements.
5.3 The light source and its associated optical system shall produce a parallel light beam, no ray of
which makes an angle of more than 0,05 rad (3°) with the beam axis. This beam shall not be vignetted
at either port of the integrating sphere.
5.4 The design of the instrument shall be such that the reading is zero in the absence of the light
beam.
5.5 The integrating sphere used to collect the transmitted light may be of any diameter (but
preferably no less than 150 mm in order to be able to accommodate large specimens), as long as the
total port area does not exceed 3,0 % of the internal reflecting area of the sphere.
2
  © ISO 2021 – All rights reserved

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ISO 14782:2021(E)
5.6 The integrating sphere shall have an entrance port, an exit port, a compensation port and a
photodetector port (see Figure 1). The entrance and exi
...

INTERNATIONAL ISO
STANDARD 14782
Second edition
Plastics — Determination of haze for
transparent materials
Plastiques — Détermination du trouble des matériaux transparents
PROOF/ÉPREUVE
Reference number
ISO 14782:2021(E)
©
ISO 2021

---------------------- Page: 1 ----------------------
ISO 14782:2021(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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii PROOF/ÉPREUVE © ISO 2021 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 14782:2021(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 2
6 Specimens . 3
7 Conditioning . 4
8 Procedure. 4
9 Expression of results . 4
10 Precision . 5
11 Test report . 6
Bibliography . 7
© ISO 2021 – All rights reserved PROOF/ÉPREUVE iii

---------------------- Page: 3 ----------------------
ISO 14782:2021(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 second edition cancels and replaces the first edition (ISO 14782:1999), which has been technically
revised. It also incorporates the Technical Corrigendum ISO 14782:1999/Cor 1:2005.
The main changes compared to the previous edition are as follows:
— Formula (1) in Clause 9 has been corrected;
— the document has been editorially 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 PROOF/ÉPREUVE © ISO 2021 – All rights reserved

---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 14782:2021(E)
Plastics — Determination of haze for transparent materials
1 Scope
This document specifies a method for the measurement of haze, an optical property resulting from
wide-angle scattering of light, in transparent and substantially colourless plastics. This method is
applicable to the measurement of haze values of less than 40 %.
NOTE The haze of abraded or matted transparent plastics can be measured, but the value obtained can be
erroneously lower than the true value due to light scattering within a narrow angle.
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 291, Plastics — Standard atmospheres for conditioning and testing
ISO/CIE 11664-1, Colorimetry — Part 1: CIE standard colorimetric observers
ISO 11664-2, Colorimetry — Part 2: CIE standard illuminants
ISO 13468-1, Plastics — Determination of the total luminous transmittance of transparent materials —
Part 1: Single-beam instrument
CIE Publication No. 15, Colorimetry
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 472 and ISO 13468-1 apply.
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 https:// www .electropedia .org/
4 Principle
Haze is determined using an integrating sphere the efficiency of which is held constant by compensation.
© ISO 2021 – All rights reserved PROOF/ÉPREUVE 1

---------------------- Page: 5 ----------------------
ISO 14782:2021(E)

5 Apparatus
5.1 The apparatus shall consist of a stabilized light source, an associated optical system, an integrating
sphere with ports, and a photometer comprising a photodetector, signal processor and display unit or
recorder (see Figure 1).
Key
1 lamp 6 exit port
2 lens 7 entrance port
3 baffle 8 integrating sphere
4 photodetector 9 compensation port
5 light trap 10 specimen holder
Figure 1 — Schematic arrangement of the apparatus
5.2 The light source and the photometer shall be used in conjunction with a filter to provide an output
corresponding to the photopic standard luminous efficiency Vë() (as defined in ISO/CIE 11664-1),
which is identical to the colour-matching function yë specified in ISO/CIE 11664-1 under CIE standard
()
illuminant D as specified in ISO 11664-2. The output of the photodetector shall be proportional to the
65
incident flux, to within 1 % of the incident flux, over the range used.
The spectral and photometric characteristics of the light source and photometer shall be kept constant
during measurements.
5.3 The light source and its associated optical system shall produce a parallel light beam, no ray of
which makes an angle of more than 0,05 rad (3°) with the beam axis. This beam shall not be vignetted at
either port of the integrating sphere.
5.4 The design of the instrument shall be such that the reading is zero in the absence of the light beam.
5.5 The integrating sphere used to collect the transmitted light may be of any diameter (but preferably
no less than 150 mm in order to be able to accommodate large specimens), as long as the total port area
does not exceed 3,0 % of the internal reflecting area of the sphere.
5.6 The integrating sphere shall have an entrance port, an exit port, a compensation port and a
photodetector port (see Figure 1). The entrance and exit ports shall be centred on the same great circle
2 PROOF/ÉPREUVE © ISO 2021 – All rights reserved

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