ISO/PRF 14782

Plastics -- Determination of haze for transparent materials

Plastiques -- Détermination du trouble des matériaux transparents

General Information

• Status: Published
• 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: 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
• Start Date: 19-Aug-2021

RELATIONS

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

Standards Content (sample)

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
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ISO 14782:2021(E)
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© ISO 2021

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Published in Switzerland
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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

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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.
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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.

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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 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.

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

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