SIST EN ISO 2813:2015

SLOVENSKI STANDARD
SIST EN ISO 2813:2015
01-januar-2015
1DGRPHãþD
SIST EN ISO 2813:1999
Barve in laki - Ugotavljanje vrednosti sijaja pod koti 20, 60 in 85 stopinj (ISO
2813:2014)
Paints and varnishes - Determination of gloss value at 20 degrees, 60 degrees and 85
degrees (ISO 2813:2014)
Beschichtungsstoffe - Bestimmung des Glanzwertes unter 20°, 60° und 85° (ISO
2813:2014)
Peintures et vernis - Détermination de l'indice de brillance à 20 degrés, 60 degrés et 85
degrés (ISO 2813:2014)
Ta slovenski standard je istoveten z: EN ISO 2813:2014
ICS:
87.040 Barve in laki Paints and varnishes
SIST EN ISO 2813:2015 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 2813:2015

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SIST EN ISO 2813:2015

EUROPEAN STANDARD
EN ISO 2813

NORME EUROPÉENNE

EUROPÄISCHE NORM
October 2014
ICS 87.040 Supersedes EN ISO 2813:1999
English Version
Paints and varnishes - Determination of gloss value at 20
degrees, 60 degrees and 85 degrees (ISO 2813:2014)
Peintures et vernis - Détermination de l'indice de brillance à Beschichtungsstoffe - Bestimmung des Glanzwertes unter
20 degrés, 60 degrés et 85 degrés (ISO 2813:2014) 20°, 60° und 85° (ISO 2813:2014)
This European Standard was approved by CEN on 24 August 2014.

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
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 2813:2014 E
worldwide for CEN national Members.

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SIST EN ISO 2813:2015
EN ISO 2813:2014 (E)
Contents Page
Foreword .3
2

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SIST EN ISO 2813:2015
EN ISO 2813:2014 (E)
Foreword
This document (EN ISO 2813:2014) has been prepared by Technical Committee ISO/TC 35 "Paints and
varnishes" in collaboration with Technical Committee CEN/TC 139 “Paints and varnishes” 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 April 2015, and conflicting national standards shall be withdrawn at the
latest by April 2015.
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 2813:1999.
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 2813:2014 has been approved by CEN as EN ISO 2813:2014 without any modification.

3

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SIST EN ISO 2813:2015

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SIST EN ISO 2813:2015
INTERNATIONAL ISO
STANDARD 2813
Fourth edition
2014-10-01
Paints and varnishes — Determination
of gloss value at 20°, 60° and 85°
Peintures et vernis — Détermination de l’indice de brillance à 20°, 60°
et 85°
Reference number
ISO 2813:2014(E)
©
ISO 2014

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SIST EN ISO 2813:2015
ISO 2813:2014(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2014
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
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2014 – All rights reserved

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SIST EN ISO 2813:2015
ISO 2813:2014(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Basic principles of the gloss measurement . 2
6 Apparatus and calibration equipment . 4
6.1 Glossmeter . 4
6.2 Measurement standards (certified reference material, working measurement standards) 7
7 Test panels . 8
7.1 Substrate . 8
7.2 Preparation and coating . . 8
7.3 Drying and conditioning . 8
7.4 Thickness of coating . 8
8 Calibration and adjustment of the glossmeter . 8
8.1 Preparation of the apparatus . 8
8.2 Zero point check . 8
8.3 Calibration and adjustment . 9
9 Procedure. 9
9.1 Selection of geometry . . 9
9.2 Gloss measurement . 9
10 Precision .10
10.1 General .10
10.2 Repeatability limit .10
10.3 Reproducibility limit .10
11 Test report .10
Annex A (normative) Possible sources of error .12
Annex B (normative) Calibration standards .15
Annex C (informative) Gloss calculation of primary reference standards .17
Annex D (informative) Details on precision .21
Bibliography .23
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SIST EN ISO 2813:2015
ISO 2813:2014(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 35, Paints and varnishes, Subcommittee SC 9,
General test methods for paints and varnishes.
This fourth edition cancels and replaces the third edition (ISO 2813:1994), which has been technically
revised. It also incorporates the Technical Corrigendum ISO 2813:1994/Cor.1:1997.
The main technical changes are:
a) the title has been changed;
b) the scope has been extended to include gloss measurement of metallic coatings;
c) the term “specular gloss” has been replaced by “gloss”;
d) the gloss value is indicated in gloss units (GU);
e) a new annex (Annex A) concerning possible sources of error has been added;
f) a new annex (Annex B) concerning calibration standards has been added;
g) a new annex (Annex C) concerning gloss calculation of primary reference standards has been added;
h) a new annex (Annex D) concerning details on precision has been added;
i) the precision data are the results of a large interlaboratory test.
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SIST EN ISO 2813:2015
INTERNATIONAL STANDARD ISO 2813:2014(E)
Paints and varnishes — Determination of gloss value at
20°, 60° and 85°
1 Scope
This International Standard specifies a method for determining the gloss of coatings using the three
geometries of 20°, 60° or 85°. The method is suitable for the gloss measurement of non-textured coatings
on plane, opaque substrates.
NOTE On test specimens different from these mentioned above, comparative gloss measurements are
possible. However, it is not ensured that the obtained gloss values correspond to the visual gloss perception (see
Annex A).
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 1514, Paints and varnishes — Standard panels for testing
ISO 2808, Paints and varnishes — Determination of film thickness
ISO 4618:2014, Paints and varnishes — Terms and definitions
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4618 and the following apply.
3.1
gloss
optical property of a surface, characterized by its ability to reflect light specularly
Note 1 to entry: Examples of degrees of gloss are high gloss, gloss, silk gloss, semigloss, satin, matt, and dead matt.
[SOURCE: ISO 4618:2014, 2.132]
3.2
geometry
identification of a method of gloss measurement using a specified angle with assigned apertures
3.3
gloss value
ratio multiplied by 100 of the luminous flux reflected from a specimen to that reflected by a glass
surface with a refractive index of 1,567 at a wavelength of 587,6 nm in specular direction for a specified
reflection angle and specified aperture angles of light source and receptor
Note 1 to entry: The gloss value is indicated in gloss units (GU). It is not permitted to interpret and express gloss
values as “% reflection”.
Note 2 to entry: Gloss values measured on coatings are expressed rounded to the nearest integer (without
decimals).
Note 3 to entry: To define the gloss scale, polished black glass with a refractive index of 1,567 at a wavelength of
587,6 nm is assigned to the value of 100 for 20°, 60° and 85° geometries.
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SIST EN ISO 2813:2015
ISO 2813:2014(E)

Note 4 to entry: A glass surface with a reflective index of 1,567 at a wavelength of 546,1 nm (which is the central
wavelength of the spectral luminous efficiency function) may be used.
Note 5 to entry: The gloss value is influenced by the surface characteristics, e.g. roughness, texture, structure, of
the sample.
4 Principle
With a reflectometric apparatus, gloss values are determined on coated surfaces, correlating with the
visual gloss perception. In this context (glossmeter), the ratio of the gloss of the coating and the gloss of
a polished plane glass plate with specified reference refractive index is obtained.
The method of gloss measurement is specified by the following parameters:
— measuring angles;
— field stop apertures;
— spectral adaptation;
— reference refractive index.
5 Basic principles of the gloss measurement
Gloss is a visual perception caused by looking at surfaces. The specular reflection of objects is even more
distinct when light is reflected more directionally from the surface. The incident light is reflected on
high-gloss surfaces only in the main specular direction. On matt surfaces the light is not only reflected
in the main specular direction but also diffusely scattered in all solid angles. The more uniformly the
light is scattered into the space the smaller is the intensity of the directed component and the matter
the surface appears.
The principle of gloss measurement is based on the measurement of the directionally reflected light. In
this context its intensity is measured in a defined angular field around the reflection angle. The intensity
of the reflected light depends on the surface material and the incident angle. Accordingly, on coated
surfaces with increasing incident angle more light is reflected. The remaining light is refracted at the
interface air/coating, and within the coating diffusion and/or absorption of the light occurs.
The gloss values are not related to the intensity of the incident light but to the reflection properties of a
black, polished glass standard with specified refractive index.
For different viewing angles the gloss perception can vary widely. For example matt surfaces can appear
glossy under grazing incidence of light and low viewing angle, because under these reflection conditions
a lot of light is reflected directionally and also the intensity of diffusion is low.
Figure 1 illustrates the relation between the gloss perception of visually equally classified coating
specimens (from matt to glossy) and the assigned gloss values for the measuring angles of 20°, 60° and
85°.
EXAMPLE Visual classification 9 corresponds to 35 GU under 20°, 70 GU under 60° and 95 GU under 85°.
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SIST EN ISO 2813:2015
ISO 2813:2014(E)

Key
Y gloss value
X increasing gloss perception from matt to glossy
Figure 1 — Gloss curves
Due to the non-linearity of the characteristic curves in accordance with Figure 1, the gloss for each
measuring angle can only be differentiated over a specific range. In practice – depending on the degree
of gloss of the specimen surface – the following measuring angles have been proved (see Figure 2):
— 20° geometry for high-gloss surfaces;
— 60° geometry for semigloss surfaces;
— 85° geometry for matt surfaces.
For each gloss value the geometry shall be indicated.
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SIST EN ISO 2813:2015
ISO 2813:2014(E)

Figure 2 — Measuring angles
6 Apparatus and calibration equipment
6.1 Glossmeter
6.1.1 Optical construction and course of beam
The course of beam of the glossmeter is illustrated in Figure 3. The light of a source is collimated onto
the test surface at a specified angle, and the reflected light is received by a lens at the same angle and
focused onto a photo detector.
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SIST EN ISO 2813:2015
ISO 2813:2014(E)

Key
1 light source (source) 9 optical axis of the incident beam
2 source image aperture 10 optical axis of the receptor beam
3 source lens 11 surface normal of the test specimen
4 receptor lens 12 direction of measurement
5 test surface α angle between 9 and 11
1
6 receptor field stop α angle between 10 and 11
2
7 image of the source aperture in the receptor field stop receptor aperture angle
ϑ
r
8 photo detector (receptor) source image aperture angle
ϑ
S
Figure 3 — Course of beam of the glossmeter
6.1.2 Geometries
The axis of the incident beam shall be at an angle (α ) of (20,0 ± 0,1)°, (60,0 ± 0,1)°, or (85,0 ± 0,1)° to the
1
normal to the surface under test. With a flat piece of polished black glass or a front-reflecting mirror
instead of the test panel position, the source field stop shall be reproduced at the centre of the receptor
field stop.
The optical axis of the receptor beam shall coincide with the mirror image of the optical axis of the
incident beam to within ± 0,1°, i.e. the condition |α – α | ≤ 0,1° shall be fulfilled (see Figure 3).
1 2
The dimensions of the source aperture and the receptor aperture and the permissible tolerances shall
be as indicated in Table 1.
There shall be no vignetting of rays that lie within the specified angular fields.
The direction of measurement (see Figure 3) shall be obvious on the apparatus.
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SIST EN ISO 2813:2015
ISO 2813:2014(E)

Table 1 — Angles of source image aperture and receptor aperture
Aperture angle
In parallel to plane of reflection Perpendicular to the plane of reflec-
tion
Source image aperture
0,75° ± 0,10° 2,5° ± 0,1°
(all geometries)
Receptor aperture
1,80° ± 0,05° 3,6° ± 0,1°
(20° geometry)
Receptor aperture
4,4° ± 0,1° 11,7° ± 0,2°
(60° geometry)
Receptor aperture
4,0° ± 0,3° 6,0° ± 0,3°
(85° geometry)
NOTE 1 In Figure 3 the plane of reflection corresponds to the plane of illustration.
NOTE 2 In Figure 3 only the aperture angles in parallel to the plane of reflection are illustrated.
NOTE 3 By specifying the aperture angles it is ensured that for the gloss measurement only a maximum
proportion of the scattered light is received.
6.1.3 Filtering at the receptor
Filtering at the receptor shall be done in such a way that the transmittance of the filter τ(λ) is given by
Formula (1).
VS()λλ× ()
C
τλ()=k (1)
LL()λλ× ()
relS
where
V(λ) is the CIE photopic luminous efficiency;
S (λ) is the spectral power distribution of CIE illuminant C;
C
L(λ) is the relative spectral sensitivity of the receptor;
rel
L (λ) is the spectral power distribution of the illuminating source;
S
k is a calibration constant.
NOTE By means of such filtering the gloss values refer to a uniform illuminant (C) and are adapted spectrally
to the gloss perception of an observer.
6.1.4 Technical requirements for the glossmeter
The receptor measurement device shall give a reading proportional to the light flux passing the receptor
field stop with a deviation of 1 GU at maximum.
The apparatus shall be calibratable and adjustable.
NOTE For glossmeters with automatically proceeding calibration routine the calibration and adjustment are
carried out automatically.
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SIST EN ISO 2813:2015
ISO 2813:2014(E)

6.2 Measurement standards (certified reference material, working measurement
1)
standards)
6.2.1 High-gloss standard A (working measurement standard)
Plane black glass or ceramic plate with the following properties:
— surface grinded and polished;
— gloss values ≥ 88 GU.
Thickness, rear side, and edges shall be made in such a way that interfering light, scattered light and
reflected light from the edges and the rear side are avoided.
The following parameters shall be recorded on the standard:
— direction of measurement;
— geometry (geometries);
— assigned gloss value(s).
The measurement standard shall conform to Annex B.
6.2.2 Medium-gloss standard B (working measurement standard)
For testing the linearity medium-gloss standards may be used. The medium-gloss standard may be of
ceramic tile, black glass, or other materials with uniform gloss. Thickness, rear side, and edges shall be
constructed in a way so that interfering light, scattered light, and reflected light from the edges and the
rear side are avoided.
The following parameters shall be recorded on the standard:
— direction of measurement;
— geometry (geometries);
— assigned gloss value(s).
The measurement standard shall conform to Annex B.
6.2.3 Zero standard C (working measurement standard)
Plane plate made of metal, glass, or rigid plastic [e.g. poly(methyl methacrylate) – PMMA] with or without
a coating whose gloss for all geometries is lower than 0,1 GU.
NOTE 1 Black flock has been proved suitable for use as coating material for the zero standard.
NOTE 2 Glossmeters with automatically proceeding calibration routine do not require a zero standard, since
the zero calibration and the offset adjustment are carried out with the light source turned off.
The measurement standard shall conform to Annex B.
6.2.4 Certified reference material (CRM)
Plane black glass or ceramic plate or quartz glass plate with the following properties:
— plane surface grinded and polished;
— gloss values ≥ 88 GU.
1) See ISO/IEC Guide 99.
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SIST EN ISO 2813:2015
ISO 2813:2014(E)

Thickness, rear side, and edges shall be made in such a way that interfering light, scattered light, and
reflected light from the edges and the rear side are avoided.
The following parameters shall be recorded on the standard:
— direction of measurement;
— geometry (geometries);
— assigned gloss value(s).
The measurement standard shall conform to Annex B and Annex C.
7 Test panels
7.1 Substrate
Unless otherwise agreed, select the substrate in regard to the intended practical use from the substrates
described in ISO 1514. The test panels shall be plane and free of deformations (see Annex A).
7.2 Preparation and coating
Prepare each test panel in accordance with ISO 1514 and coat it in accordance with the specified method
with the coating material or multi-coat system to be tested.
7.3 Drying and conditioning
Dry/harden (stove, if applicable) and age, if applicable, each coated test panel for the specified period of
time and under the specified conditions. Condition the coated test panels before the test at (23 ± 2) °C
and a relative humidity of (50 ± 5) % for at least 16 h. Other conditions for conditioning shall be agreed
and indicated in the test report.
Finger prints, dust, or other contaminations on the surface lead to changed and/or imprecise gloss
values. Consequently, the coated test panels shall be stored and handled accordingly.
In the case of aged samples, the preparation has to eliminate the potential dust, without altering the
surface.
7.4 Thickness of coating
Determine the dry film thickness of the coating, in micrometres, in accordance with one of the methods
specified in ISO 2808.
For comparative measurements the film thicknesses shall correspond.
8 Calibration and adjustment of the glossmeter
8.1 Preparation of the apparatus
Calibrate the apparatus at the start of every period of operation and during operation at intervals
sufficiently frequent to ensure correct measuring values.
8.2 Zero point check
Use the zero standard (6.2.3) to check the zero point.
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SIST EN ISO 2813:2015
ISO 2813:2014(E)

If the measuring value on this standard is not within ± 0,1 GU of zero, adjust the apparatus or subtract
the deviation from subsequent readings.
NOTE Glossmeters with automatically proceeding calibration routine do not require a zero standard, since
the zero calibration and the offset adjustment are carried out with the light source turned off.
8.3 Calibration and adjustment
Adjust the instrument with a high-gloss reference standard (standard A, working measurement
standard, see 6.2.1) to the assigned gloss value.
NOTE For glossmeters with automatically proceeding calibration routine the calibration and adjustment are
carried out
...