EN ISO 13787:2003

SLOVENSKI STANDARD
01-december-2003
Toplotnoizolacijski proizvodi za opremo stavb in industrijske napeljave –
Ugotavljanje nazivne toplotne prevodnosti
Thermal insulation products for building equipment and industrial installations -
Determination of declared thermal conductivity (ISO 13787:2003)
Wärmedämmstoffe für die Haustechnik und für betriebstechnische Anlagen -
Bestimmung des Nennwertes der Wa¨rmeleitfähigkeit (ISO 13787:2003)
Produits isolants thermiques pour l'équipement du bâtiment et les installations
industrielles - Détermination de la conductivité thermique déclarée (ISO 13787:2003)
Ta slovenski standard je istoveten z: EN ISO 13787:2003
ICS:
91.100.60 0DWHULDOL]DWRSORWQRLQ Thermal and sound insulating
]YRþQRL]RODFLMR materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 13787
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2003
ICS 91.100.60
English version
Thermal insulation products for building equipment and industrial
installations - Determination of declared thermal conductivity
(ISO 13787:2003)
Produits isolants thermiques pour l'équipement du bâtiment Wärmedämmstoffe für die Haustechnik und für
et les installations industrielles - Détermination de la betriebstechnische Anlagen - Bestimmung des Nennwertes
conductivité thermique déclarée (ISO 13787:2003) der Wa¨rmeleitfähigkeit (ISO 13787:2003)
This European Standard was approved by CEN on 9 October 2002.
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 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 Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2003 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 13787:2003 E
worldwide for CEN national Members.

Contents
page
Foreword.3
Introduction .4
1 Scope .4
2 Normative references.4
3 Terms and definitions .5
4 Principles for the determination of declared thermal conductivity.5
5 Determination and verification of declared thermal conductivity.6
5.1 Measurement of thermal conductivity .6
5.2 Procedure for verification .6
Annex A (informative) Verification based on curve comparison.9
A.1 General.9
A.2 Principle .9
A.3 Test.9
A.3.1 Measurement of thermal conductivity .9
A.3.2 Procedure for comparison and decision .9
Annex B (informative) Statistical method to establish the declared thermal conductivity curve.11
B.1 General .11
B.2 Symbols and units .11
B.3 Establishment of declared values .12
B.3.1 A large number of thermal conductivity results are available (n > 50 at each temperature) .12
B.3.2 A small number of data are available (n £ 50) .12
B.4 Verification of the declared curve .12
B.5 Examples.13
B.5.1 Establishment of the declared curve.13
B.5.2 Verification of the declared curve.15
Annex C (informative) Illustration of the procedure to verify thermal conductivity.19
Bibliography .22
Foreword
This document (EN ISO 13787:2003) has been prepared by Technical Committee CEN/TC 89 "Thermal
performance of buildings and building components", the secretariat of which is held by SIS, in collaboration with
Technical Committee ISO/TC 163 "Thermal performance and energy use in the built environment".
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 September 2003, and conflicting national standards shall be withdrawn at the
latest by September 2003.
Annexes A, B and C are informative.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal,
Slovakia, Spain, Sweden, Switzerland and the United Kingdom.
Introduction
This standard gives the procedure for the determination of the declared thermal conductivity of thermal insulation
materials and products, which are used for the insulation of building equipment and industrial installations.
For this area of application the thermal conductivity values are usually expressed over a wide range of
temperatures.
This standard describes the procedure necessary for the determination of the thermal conductivity values, which
the manufacturer shall declare.
The values are expressed in the form of a curve or in tabular form which shows thermal conductivity as a function
of temperature.
1 Scope
This standard establishes the procedure for the determination and verification of the declared thermal conductivity
as a function of temperature of thermal insulating materials and products used for the insulation of building
equipment and industrial installations.
The informative annex B also gives an optional method for establishing the thermal conductivity curve or table from
measured values.
The standard is not applicable to thermal insulating products used in building envelopes. For the procedures which
are used for these products, see ISO 10456, “Building materials and products – Procedures for determining
declared and design thermal values”.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For
dated references, subsequent amendments to or revisions of any of these publications apply to this European
Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the
publication referred to applies (including amendments).
EN 12667 Thermal performance of building materials and products - Determination of
thermal resistance by means of guarded hot plate and heat flow meter
methods - Products of high and medium thermal resistance.
EN ISO 7345:1995 Thermal insulation - Physical quantities and definitions (ISO 7345:1987).
EN ISO 8497 Thermal insulation - Determination of steady-state thermal transmission
properties of thermal insulation for circular pipes (ISO 8497:1994).
prEN ISO 9229:1997 Thermal insulation - Definitions of terms (ISO/DIS 9229:1997).
Thermal insulation - Determination of steady-state thermal resistance and
ISO 8301
related properties - Heat flow meter apparatus.
ISO 8302 Thermal insulation - Determination of steady-state thermal resistance and
related properties - Guarded hot plate apparatus.
3 Terms and definitions
For the purposes of this European Standard, the terms and definitions given in EN ISO 7345:1995, prEN ISO
9229:1997 and the following apply.
3.1
reference mean temperature
mean temperature selected for use as the basis for physical property measurement and expression of data for
those materials where physical properties change with temperature
3.2
declared value
value declared by a manufacturer which is derived from measured values under specified conditions and rules
3.3
declared thermal value
expected value of a thermal property of a building material or product
— assessed from measured data at reference conditions of temperature and humidity;
— given for a stated fraction and confidence level according to the determination method in this standard;
— corresponding to a reasonable expected service lifetime under normal conditions.
NOTE The declared thermal value includes the effects of ageing and dispersion in the measured values.
3.4
declared thermal conductivity curve
curve giving the thermal conductivity at different temperatures for a material or product conditioned in equilibrium
with a standard atmosphere (23 °C, 50 % relative humidity) based on the declared thermal values
4 Principles for the determination of declared thermal conductivity
The manufacturer shall present his proposed declared thermal conductivity of the material or product in the form of
a curve as a function of the mean temperature or a table with a number of values in accordance with 5.1.
The product shall then be subjected to a test according to clause 5, with test specimens representative of the
product.
If the test is passed, the proposed declared thermal conductivity curve or table becomes the declared thermal
conductivity curve or table.
NOTE 1 An alternative procedure to the one given in the standard is given in annex A.
NOTE 2 An optional statistical method to establish the declared thermal conductivity curve is given in annex B.
5 Determination and verification of declared thermal conductivity
5.1 Measurement of thermal conductivity
The test specimens shall be aged, if necessary, before measurements are made. As an alternative, a correction
factor for ageing shall be applied.
NOTE Ageing procedures are found in product specifications, where relevant.
Measurements shall be carried out in accordance with ISO 8301, ISO 8302 or EN 12667 for flat test specimens and
EN ISO 8497 for cylindrical test specimens.
The temperature difference between the hot and cold faces shall range from 10 K to 40 K for flat test specimens.
The temperature difference shall be chosen to maximize the accuracy of the measurement. For cylindrical
specimens, tested in accordance with EN ISO 8497, these requirements on temperature difference do not apply,
but the temperature difference shall not be smaller than 10 K.
Measurements shall be made at three different mean temperatures at least.
For mean temperatures up to 500 °C, the curve determined in the test shall be based upon measurements at
intervals of a maximum of 100 K, over the whole service temperature range stated by the manufacturer.
Thermal conductivity shall also be measured at temperatures close to inflexion points or other irregularities of the
curve.
For mean temperatures greater than 500 °C, the curve determined in the test shall be based upon measurements
at intervals of a maximum of 200 K.
No extrapolation of test results beyond the measured temperature range is permitted. The measured thermal
conductivities shall be rounded up to the nearest 0,001 W/(m⋅K).
The results shall be expressed either by a temperature/thermal conductivity curve or by a table. The comparison
with the proposed curve or table is only made at the temperatures of measurement.
5.2 Procedure for verification
Select three different samples. Take the test specimens from these samples at random, as required.
Measure the thermal conductivity of the test specimen from the first sample in accordance with the method
described in 5.1.
Compare the results of the measurements with the values obtained from the proposed curve or table.
— If the measured values are all less than or equal to the thermal conductivities derived from the proposed curve
or table, the test is passed and the proposed curve or table becomes the declared curve or table.
— If one or more of the measured values exceeds the corresponding thermal conductivity of the proposed curve or
table by 10 % or more, the test has failed.
— If there are measured values above the values on the proposed curve or in the table but none of them exceeds
the corresponding thermal conductivity by 10 %, then two new test specimens shall be measured in accordance
with the method described in 5.1, one specimen being taken from each of the two remaining samples.
For temperatures £ below 100 °C, measure the thermal conductivities of the second and third specimen at
temperatures within ± 5 K of the values measured for the first specimen. Increase this to ± 10 K for temperatures
above 100 °C.
If none of the new measurements exceeds the proposed curve or table by 10 % or more, the measured thermal
conductivities shall be converted to the temperatures at which the measurements for the first curve were made,
using the slope of the first curve to make the conversion.
Results of the measurements above the proposed curve or the value in the table by 10% or more shall constitute a
failure of the test.
Calculate the values of thermal conductivity at the corresponding temperatures by calculating the mean of the three
values measured or converted at each temperature.
— If all these new mean values are lower than or equal to the corresponding thermal conductivities of the
proposed declared curve, the test has passed, in which event the proposed declared curve or table becomes
the declared curve or table.
—
If one or more of the new mean values is higher than the corresponding thermal conductivity of the proposed
declared curve or table, the test has failed.
The verification procedure is described in the flow chart in Figure 1 and illustrated in annex C.
Figure 1 - Flow chart for verifying the thermal conductivity
EN ISO
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