SIST EN ISO 8254-2:2016
(Main)Paper and board - Measurement of specular gloss - Part 2: 75 degree gloss with a parallel beam, DIN method (ISO 8254-2:2016)
Paper and board - Measurement of specular gloss - Part 2: 75 degree gloss with a parallel beam, DIN method (ISO 8254-2:2016)
This part of ISO 8254 specifies a photometric test method for the assessment of visual gloss by means
of a reflectometer value measured at an angle of 75°. It is applicable to plane paper and board surfaces
of gloss levels below 65, measured according to this part of ISO 8254. It should be the preferred method
for paper and board surfaces of gloss levels below 20, measured according to this part of ISO 8254.
Materials containing optical brightening agents may be measured.
Papier und Pappe - Bestimmung des Glanzes - Teil 2: Messung mit einem parallelen Strahl bei 75°, DIN-Verfahren (ISO 8254-2:2016)
Dieser Teil der ISO 8254 legt ein photometrisches Prüfverfahren zur Bewertung des Glanzes mithilfe eines Reflektometerwertes fest, der bei einem Winkel von 75° gemessen wird. Sie gilt für ebene Papier und Pappenoberflächen mit einem nach diesem Teil der ISO 8254 ermittelten Glanzwert von unter 65. Sie sollte für Papier und Pappenoberflächen mit nach diesem Teil der ISO 8254 ermittelten Glanzwerten von unter 20 das bevorzugte Verfahren darstellen. Materialien, die optisch aufhellende Bestandteile enthalten, dürfen gemessen werden.
Papiers et cartons - Mesurage du brillant spéculaire - Partie 2: Brillant à 75 degrés avec un faisceau parallèle, méthode DIN (ISO 8254-2:2016)
L'ISO 8254-2 :2016 spécifie une méthode d'essai photométrique pour l'évaluation du brillant visuel à l'aide d'une valeur réflectométrique mesurée suivant un angle de 75°. Elle est applicable aux papiers et cartons dont la surface est plane et présente un niveau de brillant, mesuré selon l'ISO 8254-2 :2016, inférieur à 65. Il convient de préférer cette méthode pour les papiers et cartons dont la surface présente un niveau de brillant, mesuré selon l'ISO 8254-2 :2016, inférieur à 20. Les matériaux contenant des agents d'azurage optique peuvent être mesurés.
Papir, karton in lepenka - Merjenje zrcalnega sijaja - 2. del: 75-stopinjski sijaj z vzporednim snopom svetlobe, metoda po DIN (ISO 8254-2:2016)
Ta del standarda ISO 8254 določa fotometrične preskusne metode za oceno vizualnega sijaja s pomočjo reflektometrske vrednosti, izmerjene pod kotom 75°. Uporablja se za površine navadnega papirja in kartona z ravnmi sijaja pod 65, izmerjenimi v skladu s tem delom standarda ISO 8254. To je priporočljiva metoda za navadni papir in karton z ravnmi sijaja pod 20, izmerjenimi v skladu s tem delom standarda ISO 8254. Lahko se merijo materiali, ki vsebujejo optična belilna sredstva.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 8254-2:2016
01-november-2016
1DGRPHãþD
SIST EN ISO 8254-2:2003
Papir, karton in lepenka - Merjenje zrcalnega sijaja - 2. del: 75-stopinjski sijaj z
vzporednim snopom svetlobe, metoda po DIN (ISO 8254-2:2016)
Paper and board - Measurement of specular gloss - Part 2: 75 degree gloss with a
parallel beam, DIN method (ISO 8254-2:2016)
Papier und Pappe - Bestimmung des Glanzes - Teil 2: Messung mit einem parallelen
Strahl bei 75°, DIN-Verfahren (ISO 8254-2:2016)
Papiers et cartons - Mesurage du brillant spéculaire - Partie 2: Brillant à 75 degrés avec
un faisceau parallèle, méthode DIN (ISO 8254-2:2016)
Ta slovenski standard je istoveten z: EN ISO 8254-2:2016
ICS:
85.060 Papir, karton in lepenka Paper and board
SIST EN ISO 8254-2:2016 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST EN ISO 8254-2:2016
---------------------- Page: 2 ----------------------
SIST EN ISO 8254-2:2016
EN ISO 8254-2
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2016
EUROPÄISCHE NORM
ICS 85.060 Supersedes EN ISO 8254-2:2003
English Version
Paper and board - Measurement of specular gloss - Part 2:
75 degree gloss with a parallel beam, DIN method (ISO
8254-2:2016)
Papiers et cartons - Mesurage du brillant spéculaire - Papier und Pappe - Bestimmung des Glanzes - Teil 2:
Partie 2: Brillant à 75 degrés avec un faisceau parallèle, Messung mit einem parallelen Strahl bei 75°, DIN-
méthode DIN (ISO 8254-2:2016) Verfahren (ISO 8254-2:2016)
This European Standard was approved by CEN on 19 May 2016.
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 CEN-CENELEC Management Centre 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 CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8254-2:2016 E
worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 8254-2:2016
EN ISO 8254-2:2016 (E)
Contents Page
European foreword . 3
2
---------------------- Page: 4 ----------------------
SIST EN ISO 8254-2:2016
EN ISO 8254-2:2016 (E)
European foreword
This document (EN ISO 8254-2:2016) has been prepared by Technical Committee ISO/TC 6 “Paper,
board and pulps” in collaboration with Technical Committee CEN/TC 172 “Pulp, paper and board” the
secretariat of which is held by DIN.
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 January 2017, and conflicting national standards shall
be withdrawn at the latest by January 2017.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
This document supersedes EN ISO 8254-2:2003.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 8254-2:2016 has been approved by CEN as EN ISO 8254-2:2016 without any
modification.
3
---------------------- Page: 5 ----------------------
SIST EN ISO 8254-2:2016
---------------------- Page: 6 ----------------------
SIST EN ISO 8254-2:2016
INTERNATIONAL ISO
STANDARD 8254-2
Second edition
2016-07-01
Paper and board — Measurement of
specular gloss —
Part 2:
75° gloss with a parallel beam, DIN
method
Papiers et cartons — Mesurage du brillant spéculaire —
Partie 2: Brillant à 75° avec un faisceau parallèle, méthode DIN
Reference number
ISO 8254-2:2016(E)
©
ISO 2016
---------------------- Page: 7 ----------------------
SIST EN ISO 8254-2:2016
ISO 8254-2:2016(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 8254-2:2016
ISO 8254-2:2016(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Equipment . 2
5.1 Reflectometer . 2
5.2 Gloss standards . 2
5.2.1 Zero-gloss standards . 2
5.2.2 Primary gloss standards . 2
5.2.3 Working standards . 3
5.2.4 Intermediate gloss standards . 3
6 Sampling . 4
7 Preparation of test pieces . 4
7.1 Conditioning . 4
7.2 Preparation . 4
8 Procedure. 4
8.1 Calibration . 4
8.2 Determination of reflectometer value . 5
8.3 Calculation and expression of results. 5
9 Test report . 5
Annex A (normative) Description of the instrument. 6
Annex B (informative) Nominated organizations for calibration of intermediate gloss standards 10
Bibliography .11
© ISO 2016 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 8254-2:2016
ISO 8254-2:2016(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 on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 6, Paper, board and pulps.
This second edition cancels and replaces the first edition (ISO 8254-2:2003), which has been editorially
revised (minor revision) to update the bibliographic references.
ISO 8254 consists of the following parts, under the general title Paper and board — Measurement of
specular gloss:
— Part 1: 75° gloss with a converging beam, TAPPI method
— Part 2: 75° gloss with a parallel beam, DIN method
— Part 3: 20° gloss with a converging beam, TAPPI method
Annex A forms a normative part of this part of ISO 8254. Annex B is for information only.
iv © ISO 2016 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 8254-2:2016
ISO 8254-2:2016(E)
Introduction
Visual gloss is a sensory impression which cannot yet be described completely. Some important physical
variables which influence gloss are however known. The sensory perception of gloss under a suitable
illumination results from a physical stimulus due to reflection of light from a surface. This reflection
is defined by an indicatrix which changes with the angle of incidence. The maximum indicatrix value
which is decisive for visual gloss impression is associated with specular reflection, at an angle of
reflection which is approximately equal to the angle of incidence. The reflectometer value is determined
by averaging the reflection in a defined angular region centred in the specular direction.
NOTE 1 A reflectometer value is a measure of the visual gloss only when the optical conditions of measurement,
such as angles and apertures of illumination and observation, are similar to the conditions of viewing.
NOTE 2 Because luminance and structure enter to some extent into the reflectometer value of the test piece,
only the comparison of test pieces with nearly the same luminance and structure is meaningful. The influence
of luminance on the measurement result decreases rapidly with increasing reflectometer value and increasing
angle of reflection.
The proportion of specular reflection in the entire reflection increases with increasing angle of
incidence. Very matt surfaces generate a noticeable degree of specular reflection and, therefore, a
noticeable gloss effect only above a certain minimum angle of incidence. On the other hand, a large
angle of incidence reduces the ability to differentiate between surfaces of high gloss.
NOTE 3 Manufacturers of coated papers usually divide their products into two classes according to their
surface gloss: matt coating and gloss coating. However, these classes are only defined approximately. The
matt class has reflectometer values, measured according to this part of ISO 8254, from 0 to approximately 20.
The glossy class has reflectometer values higher than this value. As there is no precise correlation between
reflectometer values measured with different geometries, it is advisable to compare the reflectometer values
only within a single class of papers and using the same measuring geometry.
This part of ISO 8254 describes measurement at an angle of incidence of 75° using a parallel beam
geometry commonly known as the 75° DIN method. Precision data are not available at the time of
publication.
NOTE 4 EN 14086 describes measurement at an angle of 45°.
© ISO 2016 – All rights reserved v
---------------------- Page: 11 ----------------------
SIST EN ISO 8254-2:2016
---------------------- Page: 12 ----------------------
SIST EN ISO 8254-2:2016
INTERNATIONAL STANDARD ISO 8254-2:2016(E)
Paper and board — Measurement of specular gloss —
Part 2:
75° gloss with a parallel beam, DIN method
1 Scope
This part of ISO 8254 specifies a photometric test method for the assessment of visual gloss by means
of a reflectometer value measured at an angle of 75°. It is applicable to plane paper and board surfaces
of gloss levels below 65, measured according to this part of ISO 8254. It should be the preferred method
for paper and board surfaces of gloss levels below 20, measured according to this part of ISO 8254.
Materials containing optical brightening agents may be measured.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 186, Paper and board — Sampling to determine average quality
ISO 187, Paper, board and pulps — Standard atmosphere for conditioning and testing and procedure for
monitoring the atmosphere and conditioning of samples
ISO 10110-5, Optics and photonics — Preparation of drawings for optical elements and systems — Part 5:
Surface form tolerances
CIE 038-1977, Radiometric and photometric characteristics of materials and their measurement
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
indicatrix
–2
angular distribution of the reflected light which is measured as illuminance (lm m ) on the receptor
3.2
reflectometer
instrument for measuring quantities pertaining to reflection
3.3
reflectometer value
measured value which, for a given angle of incidence, is proportional to the integral of the reflection
indicatrix within the solid angle defined by the apertures (see A.2.1) and is equal to 100 times the ratio
of the value obtained for the sample to that of a defined specularly reflecting surface (5.2.2)
3.4
specular gloss
reflectometer value as defined in 3.3
Note 1 to entry: The defined specularly reflecting surface thus has an assigned reflectometer value of 100.
Reflectometer values are therefore not percentages.
© ISO 2016 – All rights reserved 1
---------------------- Page: 13 ----------------------
SIST EN ISO 8254-2:2016
ISO 8254-2:2016(E)
4 Principle
The sample is illuminated with a collimated beam at an angle of 75° to the normal, and the reflectometer
value is measured within a solid angle defined by a given aperture at an
...
SLOVENSKI STANDARD
kSIST FprEN ISO 8254-2:2016
01-april-2016
Papir, karton in lepenka - Merjenje zrcalnega sijaja - 2. del: 75-stopinjski sijaj z
vzporednim snopom svetlobe, metoda po DIN (ISO/FDIS 8254-2:2016)
Paper and board - Measurement of specular gloss - Part 2: 75 degree gloss with a
parallel beam, DIN method (ISO/FDIS 8254-2:2016)
Papier und Pappe - Bestimmung des Glanzes - Teil 2: Messung mit einem parallelen
Strahl bei 75°, DIN-Verfahren (ISO/FDIS 8254-2:2016)
Papiers et cartons - Mesurage du brillant spéculaire - Partie 2: Brillant à 75 degrés avec
un faisceau parallèle, méthode DIN (ISO/FDIS 8254-2:2016)
Ta slovenski standard je istoveten z: FprEN ISO 8254-2
ICS:
85.060 Papir, karton in lepenka Paper and board
kSIST FprEN ISO 8254-2:2016 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
kSIST FprEN ISO 8254-2:2016
---------------------- Page: 2 ----------------------
kSIST FprEN ISO 8254-2:2016
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 8254-2
ISO/TC 6
Paper and board — Measurement of
Secretariat: SCC
specular gloss —
Voting begins on:
2016-02-18
Part 2:
Voting terminates on:
75 degree gloss with a parallel beam,
2016-04-18
DIN method
Papiers et cartons — Mesurage du brillant spéculaire —
Partie 2: Brillant à 75 degrés avec un faisceau parallèle, méthode DIN
Please see the administrative notes on page iii
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.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 8254-2:2016(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
©
NATIONAL REGULATIONS. ISO 2016
---------------------- Page: 3 ----------------------
kSIST FprEN ISO 8254-2:2016
ISO/FDIS 8254-2:2016(E)
ISO/CEN PARALLEL PROCESSING
This final draft has been developed within the International Organization for Standardization (ISO), and pro-
cessed under the ISO-lead mode of collaboration as defined in the Vienna Agreement. The final draft was
established on the basis of comments received during a parallel enquiry on the draft.
This final draft is hereby submitted to the ISO member bodies and to the CEN member bodies for a parallel
two-month approval vote in ISO and formal vote in CEN.
Positive votes shall not be accompanied by comments.
Negative votes shall be accompanied by the relevant technical reasons.
COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
---------------------- Page: 4 ----------------------
kSIST FprEN ISO 8254-2:2016
ISO/FDIS 8254-2:2016(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Equipment . 2
5.1 Reflectometer . 2
5.2 Gloss standards . 2
5.2.1 Zero-gloss standards . 2
5.2.2 Primary gloss standards . 2
5.2.3 Working standards . 3
5.2.4 Intermediate gloss standards . 3
6 Sampling . 4
7 Preparation of test pieces . 4
7.1 Conditioning . 4
7.2 Preparation . 4
8 Procedure. 4
8.1 Calibration . 4
8.2 Determination of reflectometer value . 5
8.3 Calculation and expression of results. 5
9 Test report . 5
Annex A (normative) Description of the instrument. 6
Annex B (informative) Nominated organizations for calibration of intermediate gloss standards 10
Bibliography .11
© ISO 2016 – All rights reserved iii
---------------------- Page: 5 ----------------------
kSIST FprEN ISO 8254-2:2016
ISO/FDIS 8254-2:2016(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 on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 6, Paper, board and pulps.
This second edition cancels and replaces the first edition (ISO 8254-2:2003), which has been editorially
revised (minor revision) to update the bibliographic references.
ISO 8254 consists of the following parts, under the general title Paper and board — Measurement of
specular gloss:
— Part 1: 75 degree gloss with a converging beam, TAPPI method
— Part 2: 75 degree gloss with a parallel beam, DIN method
— Part 3: 20 degree gloss with a converging beam, TAPPI method
Annex A forms a normative part of this part of ISO 8254. Annex B is for information only.
iv © ISO 2016 – All rights reserved
---------------------- Page: 6 ----------------------
kSIST FprEN ISO 8254-2:2016
ISO/FDIS 8254-2:2016(E)
Introduction
Visual gloss is a sensory impression which cannot yet be described completely. Some important physical
variables which influence gloss are however known. The sensory perception of gloss under a suitable
illumination results from a physical stimulus due to reflection of light from a surface. This reflection
is defined by an indicatrix which changes with the angle of incidence. The maximum indicatrix value
which is decisive for visual gloss impression is associated with specular reflection, at an angle of
reflection which is approximately equal to the angle of incidence. The reflectometer value is determined
by averaging the reflection in a defined angular region centred in the specular direction.
NOTE 1 A reflectometer value is a measure of the visual gloss only when the optical conditions of measurement,
such as angles and apertures of illumination and observation, are similar to the conditions of viewing.
NOTE 2 Because luminance and structure enter to some extent into the reflectometer value of the test piece,
only the comparison of test pieces with nearly the same luminance and structure is meaningful. The influence
of luminance on the measurement result decreases rapidly with increasing reflectometer value and increasing
angle of reflection.
The proportion of specular reflection in the entire reflection increases with increasing angle of
incidence. Very matt surfaces generate a noticeable degree of specular reflection and, therefore, a
noticeable gloss effect only above a certain minimum angle of incidence. On the other hand, a large
angle of incidence reduces the ability to differentiate between surfaces of high gloss.
NOTE 3 Manufacturers of coated papers usually divide their products into two classes, according to their
surface gloss: matt coating and gloss coating. However, these classes are only defined approximately. The
matt class has reflectometer values, measured according to this part of ISO 8254, from 0 to approximately 20.
The glossy class has reflectometer values higher than this value. As there is no precise correlation between
reflectometer values measured with different geometries, it is advisable to compare the reflectometer values
only within a single class of papers and using the same measuring geometry.
This part of ISO 8254 describes measurement at an angle of incidence of 75° using a parallel beam geometry
commonly known as the 75° DIN method. Precision data are not available at the time of publication.
NOTE 4 EN 14086 describes measurement at an angle of 45°.
© ISO 2016 – All rights reserved v
---------------------- Page: 7 ----------------------
kSIST FprEN ISO 8254-2:2016
---------------------- Page: 8 ----------------------
kSIST FprEN ISO 8254-2:2016
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 8254-2:2016(E)
Paper and board — Measurement of specular gloss —
Part 2:
75 degree gloss with a parallel beam, DIN method
1 Scope
This part of ISO 8254 specifies a photometric test method for the assessment of visual gloss by means
of a reflectometer value measured at an angle of 75°. It is applicable to plane paper and board surfaces
of gloss levels below 65, measured according to this part of ISO 8254. It should be the preferred method
for paper and board surfaces of gloss levels below 20, measured according to this part of ISO 8254.
Materials containing optical brightening agents may be measured.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 186, Paper and board — Sampling to determine average quality
ISO 187, Paper, board and pulps — Standard atmosphere for conditioning and testing and procedure for
monitoring the atmosphere and conditioning of samples
ISO 10110-5, Optics and photonics — Preparation of drawings for optical elements and systems — Part 5:
Surface form tolerances
CIE 038-1977, Radiometric and photometric characteristics of materials and their measurement
3 Terms a nd definiti ons
For the purposes of this document, the following terms and definitions apply.
3.1
indicatrix
–2
angular distribution of the reflected light which is measured as illuminance (lm m ) on the receptor
3.2
ref le c t ometer
instrument for measuring quantities pertaining to reflection
3.3
r e f le c t ome t er v a lue
measured variable which, for a given angle of incidence, is proportional to the integral of the reflection
indicatrix within the solid angle defined by the apertures (see A.2.1) and is equal to 100 times the ratio
of the value obtained for the sample to that of a defined specularly reflecting surface (5.2.2)
3.4
specular gloss
reflectometer value as defined in 3.3
Note 1 to entry: The defined specularly reflecting surface thus has an assigned reflectometer value of 100.
Reflectometer values are therefore not percentages.
© ISO 2016 – All rights reserved 1
---------------------- Page: 9 ----------------------
kSIST FprEN ISO 8254-2:2016
ISO/FDIS 8254-2:2016(E)
4 Principle
The sample is illuminated with a collimated beam at an angle of 75° to the normal, and the reflectometer
value is measured within a solid angle defined by a given aperture at an angle of reflection equal to the
angle of incidence. The scale of the reflectometer is calibrated with reference to the reflection from a
black glass plate or a quartz wedge with a specific refractive index.
5 Equipment
5.1 Reflectometer
The reflectometer shall consist of the following principal components: a collimator, a decollimator,
an electric supply for the light source device, a photoelectronic receptor and a sample holder, as
described in Annex A.
5.2 Gloss standards
The reflectometer is calibrated by means of a zero-gloss standard and a high gloss standard with a
reflectometer value between about 80 and 100. This high gloss standard can be either a primary gloss
standard or a working gloss standard.
Intermediate gloss standards with assigned reflectometer values are used to check the adjustment
of the device.
As reflectometer values of gloss standards may change due to environmental influences, they should be
checked at least once per year.
5.2.1 Zero-gloss standards
A zero-gloss standard is a gloss standard which, in the ideal case, absorbs all light falling on it. A
black cavity lined with black velvet or felt is one realization of such a gloss standard that has been
proven in practice.
5.2.2 Primary gloss standards
A primary gloss standard is a gloss standard whose reflectometer value can be calculated by means
of its refractive index u
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.