Thermal insulating products for building applications - Determination of water vapour transmission properties

This European Standard specifies the equipment and procedures for determining the water vapour transmission rate, water vapour permeance and water vapour permeability of test specimens in the steady state under different sets of specified test conditions. It is applicable to thermal insulating products. It is intended to be used for homogeneous materials and for products which may contain integral skins or facings of different material(s). A material is considered to be homogeneous, with regard to mass distribution, if its density is approximately the same throughout, i.e. if the measured density values are close to its mean density. This test method is not normally used for determining the water vapour transmission properties of single, separate vapour barriers (of high diffusion resistance), such as prefabricated films, foils, membranes or sheets, due to the long duration of the test. For products with a vapour retarder or barrier with a water vapour diffusion equivalent air layer thickness sd ≥ 1 000 m (see 3.6) other test methods e.g. IR-detection can be used for measuring the single separate vapour retarder or barrier, provided that the results obtained are in the same range as the values measured in accordance with this standard. The water vapour transmission rate and permeance values are specific to the test specimen (i.e. the product) thickness tested. For homogeneous products, the water vapour permeability is a property of the material.

Wärmedämmstoffe für das Bauwesen - Bestimmung der Wasserdampfdurchlässigkeit

Diese Europäische Norm legt Prüfeinrichtungen und Verfahren zur Bestimmung der Wasser-dampf-Diffusionsstromdichte, des Wasserdampf-Diffusionsdurchlasskoeffizienten und des Wasser-dampf-Diffusionsleitkoeffizienten im stationären Zustand an Probekörpern fest. Diese Eigenschaften können unter verschiedenen Klimabedingungen bestimmt werden. Sie gilt für Wärmedämmstoffe. Diese Norm gilt für homogene Dämmstoffe (siehe Anmerkung 1) und für Produkte, die Oberflächenschichten (Schäumhäute) oder Kaschierungen aus anderen Werkstoffen enthalten können. ANMERKUNG 1 Ein Dämmstoff wird als homogen hinsichtlich seiner Massenverteilung angesehen, wenn seine Dichte überall etwa gleich ist, das heißt, wenn die gemessenen Werte kaum vom Mittelwert seiner Rohdichte abweichen. ANMERKUNG 2 Dieses Prüfverfahren wird üblicherweise nicht zur Bestimmung der Wasserdampfdurchlässigkeits-Eigenschaften von einzelnen, abgetrennten Dampfbremsen oder -sperren (mit hohem Diffusionswiderstand), wie vorgefertigte Filme, Folien, Membranen oder Abdeckungen verwendet, da hierfür lange Versuchszeiten erforderlich sind. Für Produkte mit Dampfbremsen oder -sperren, die eine wasserdampfdiffusionsäquivalente Luftschichtdicke sd ≥ 1000 m (siehe 3.6) aufweisen, dürfen andere Verfahren (z. B. Infrarotmessungen) zur Messung von einzelnen, abgetrennten Dampfbremsen oder -sperren verwendet werden, vorausgesetzt, dass die erzielten Ergebnisse im gleichen Bereich wie die nach dieser Norm gemessenen Werte liegen. Die Wasserdampf-Diffusionsstromdichte und der Wasserdampf-Diffusionsdurchlasskoeffizient sind abhängig von der Dicke des geprüften Probekörpers, also des Produkts. Für homogene Produkte ist der Wasser-dampf-Diffusionsleitkoeffizient eine Stoffeigenschaft.

Produits isolants thermiques destinés aux applications du bâtiment - Détermination des propriétés de transmission de la vapeur d'eau

La présente Norme européenne spécifie l'équipement et les modes opératoires permettant de déterminer le
coefficient de transmission de la vapeur d'eau, la perméance et la perméabilité à la vapeur d'eau
d'éprouvettes d’essai, en régime permanent, dans différents ensembles de conditions d'essai spécifiées. Elle
s'applique aux produits isolants thermiques.
Elle est destinée aux matériaux homogènes (voir NOTE 1) et aux produits qui peuvent présenter des peaux
entières ou des parements en matériau(x) différent(s).
NOTE 1 Un matériau est considéré comme homogène, en termes de répartition de masse, si sa masse volumique est
approximativement la même en tout point, par exemple si les valeurs mesurées de la masse volumique sont proches de
sa masse volumique moyenne.
NOTE 2 Cette méthode d'essai n'est généralement pas utilisée pour la détermination des propriétés de transmission
de la vapeur d'eau des barrières simples et pour la vapeur (d'une haute résistance à la diffusion), tels que les films
préfabriqués, les feuilles de métal, les membranes ou feuilles, en raison de la longue durée de l'essai. Pour les produits
intégrant un retardateur ou une barrière avec une diffusion de vapeur d'eau équivalente à une couche d'air d'épaisseur
sd ≥ 1 000 m (voir 3.6), d'autres méthodes d'essai, par exemple la détection IR, peuvent être utilisées pour mesurer le
retardateur ou la barrière simple à condition que les résultats obtenus restent dans le domaine des valeurs mesurées
conformément à la présente norme.
Les valeurs du coefficient de transmission de la vapeur d'eau et de la perméance sont spécifiques à
l'épaisseur de l'éprouvette (c'est-à-dire du produit) soumise à essai. Pour des produits homogènes, la
perméabilité à la vapeur d'eau est une propriété du matériau.

Toplotnoizolacijski proizvodi za uporabo v gradbeništvu - Ugotavljanje lastnosti pri prehodu zračne pare

Ta evropski standard določa opremo in postopke za ugotavljanje hitrosti prehoda, prepustnosti in tesnjenja zračne pare preskuševancev v stacionarnem stanju pod različnimi preskusnimi pogoji. Uporablja se za toplotnoizolacijske proizvode. Namenjen je uporabi za homogene materiale in proizvode, ki lahko imajo vgrajene plašče ali dodane sloje iz različnih materialov. Material je, z upoštevanjem porazdelitve mase, homogen takrat, ko je njegova gostota v celoti približno enaka, tj. če so izmerjene vrednosti gostote blizu njegovi glavni gostoti. Preskusna metoda se zaradi svoje dolžine običajno uporablja za ugotavljanje lastnosti prenosa zračne pare posameznih, ločenih parnih ovir (z visoko difuzijsko odpornostjo), kot so predizdelane obloge, folije, membrane ali trakovi. Za proizvode s parnim zaviralcem ali oviro z zračno plastjo debeline sd ≥ 1.000 m (glej točko 3.6), ki je enakovredna difuziji zračne pare, se lahko za merjenje posameznega ločenega parnega zaviralca ali ovire uporabijo druge metode, npr. odkrivanje z IR-sevanjem, če so pridobljeni rezultati v enakem vrednostnem območju kot vrednosti, izmerjene v skladu s tem standardom. Vrednost prenosa zračne pare in vrednosti prepustnosti so specifične za debelino preskušancev (tj. proizvod). Za homogene proizvode je prepustnost zračne pare lastnost materiala.

General Information

Status
Published
Public Enquiry End Date
29-Sep-2012
Publication Date
05-Jun-2013
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
27-Mar-2013
Due Date
01-Jun-2013
Completion Date
06-Jun-2013

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Wärmedämmstoffe für das Bauwesen - Bestimmung der WasserdampfdurchlässigkeitProduits isolants thermiques destinés aux applications du bâtiment - Détermination des propriétés de transmission de la vapeur d'eauThermal insulating products for building applications - Determination of water vapour transmission properties91.100.60Thermal and sound insulating materialsICS:Ta slovenski standard je istoveten z:EN 12086:2013SIST EN 12086:2013en,fr,de01-julij-2013SIST EN 12086:2013SLOVENSKI
STANDARDSIST EN 12086:19991DGRPHãþD



SIST EN 12086:2013



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12086
March 2013 ICS 91.100.60 Supersedes EN 12086:1997English Version
Thermal insulating products for building applications - Determination of water vapour transmission properties
Produits isolants thermiques destinés aux applications du bâtiment - Détermination des propriétés de transmission de la vapeur d'eau
Wärmedämmstoffe für das Bauwesen - Bestimmung der Wasserdampfdurchlässigkeit This European Standard was approved by CEN on 15 December 2012.
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
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12086:2013: ESIST EN 12086:2013



EN 12086:2013 (E) 2 Contents Page Foreword . 3 1 Scope . 5 2 Normative references . 5 3 Terms and definitions . 5 4 Principle. 6 5 Apparatus . 6 6 Test specimens . 7 7 Procedure . 8 8 Calculation and expression of results . 9 9 Accuracy of measurement . 12 10 Test report . 12 Annex A (informative)
Conversion table for water vapour transmission units . 14 Annex B (informative)
Examples of test assemblies . 15 Annex C (informative)
Information about correction procedures . 16 Bibliography. 17
SIST EN 12086:2013



EN 12086:2013 (E) 3 Foreword This document (EN 12086:2013) has been prepared by Technical Committee CEN/TC 88 “Thermal insulating materials and products”, 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 September 2013, and conflicting national standards shall be withdrawn at the latest by September 2013. 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 12086:1997.
The revision of this standard contains no major changes, only minor corrections and clarifications of an editorial nature. This European Standard is one of a series of standards which specify test methods for determining dimensions and properties of thermal insulating materials and products. It supports a series of product standards for thermal insulating materials and products which derive from the Council Directive of 21 December 1988 on the approximation of laws, regulations and administrative provisions of the Member States relating to construction products (Directive 89/106/EEC) through the consideration of the essential requirements. This European Standard has been drafted for applications in buildings but it may also be used in other areas where it is relevant. This European test standard is one of the following group of inter-related standards on test methods for determining dimensions and properties of thermal insulation materials and products, all of which fall within the scope of CEN/TC 88:  EN 822, Thermal insulating products for building applications — Determination of length and width  EN 823, Thermal insulating products for building applications — Determination of thickness  EN 824, Thermal insulating products for building applications — Determination of squareness  EN 825, Thermal insulating products for building applications — Determination of flatness  EN 826, Thermal insulating products for building applications — Determination of compression behaviour  EN 1602, Thermal insulating products for building applications — Determination of the apparent density  EN 1603, Thermal insulating products for building applications — Determination of dimensional stability under constant normal laboratory conditions (23 °C/50 % relative humidity)  EN 1604, Thermal insulating products for building applications — Determination of dimensional stability under specified temperature and humidity conditions  EN 1605, Thermal insulating products for building applications — Determination of deformation under specified compressive load and temperature conditions  EN 1606, Thermal insulating products for building applications — Determination of compressive creep SIST EN 12086:2013



EN 12086:2013 (E) 4  EN 1607, Thermal insulating products for building applications — Determination of tensile strength perpendicular to faces  EN 1608, Thermal insulating products for building applications — Determination of tensile strength parallel to faces  EN 1609, Thermal insulating products for building applications — Determination of short-term water absorption by partial immersion  EN 12085, Thermal insulating products for building applications — Determination of linear dimensions of test specimens  EN 12086, Thermal insulating products for building applications — Determination of water vapour transmission properties  EN 12087, Thermal insulating products for building applications — Determination of long-term water absorption by immersion  EN 12088, Thermal insulating products for building applications — Determination of long-term water absorption by diffusion  EN 12089, Thermal insulating products for building applications — Determination of bending behaviour  EN 12090, Thermal insulating products for building applications — Determination of shear behaviour  EN 12091, Thermal insulating products for building applications — Determination of freeze-thaw resistance  EN 12429, Thermal insulating products for building applications — Conditioning to moisture equilibrium under specified temperature and humidity conditions  EN 12430, Thermal insulating products for building applications — Determination of behaviour under point load  EN 12431, Thermal insulating products for building applications — Determination of thickness for floating floor insulating products  EN 13793, Thermal insulating products for building applications — Determination of behaviour under cyclic loading  EN 13820, Thermal insulating materials for building applications — Determination of organic content According to the CEN/CENELEC Internal Regulations, the national standards organisations 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.
SIST EN 12086:2013



EN 12086:2013 (E) 5 1 Scope This European Standard specifies the equipment and procedures for determining the water vapour transmission rate, water vapour permeance and water vapour permeability of test specimens in the steady state under different sets of specified test conditions. It is applicable to thermal insulating products. It is intended to be used for homogeneous materials and for products which may contain integral skins or facings of different material(s). A material is considered to be homogeneous, with regard to mass distribution, if its density is approximately the same throughout, i.e. if the measured density values are close to its mean density. This test method is not normally used for determining the water vapour transmission properties of single, separate vapour barriers (of high diffusion resistance), such as prefabricated films, foils, membranes or sheets, due to the long duration of the test. For products with a vapour retarder or barrier with a water vapour diffusion equivalent air layer thickness sd ≥ 1 000 m (see 3.6) other test methods e.g. IR-detection can be used for measuring the single separate vapour retarder or barrier, provided that the results obtained are in the same range as the values measured in accordance with this standard. The water vapour transmission rate and permeance values are specific to the test specimen (i.e. the product) thickness tested. For homogeneous products, the water vapour permeability is a property of the material. 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. EN 12085, Thermal insulating products for building applications — Determination of linear dimensions of test specimens 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 water vapour transmission rate g quantity of water vapour transmitted through unit area in unit time under specified conditions of temperature, humidity and thickness 3.2 water vapour permeance W quotient of the water vapour transmission rate of the test specimen and the water vapour pressure difference between the two specimen faces during the test 3.3 water vapour resistance Z inverse of water vapour permeance 3.4 water vapour permeability δ product of the permeance and the thickness of the test specimen SIST EN 12086:2013



EN 12086:2013 (E) 6 Note 1 to entry: The water vapour permeability of a homogeneous product is a property of the material. It is the quantity of water vapour transmitted per unit of time through a unit area of the product per unit of vapour pressure difference between its faces for a unit thickness. 3.5 water vapour diffusion resistance factor µ quotient of the water vapour permeability of air and the water vapour permeability of the material or the homogeneous product concerned; it indicates the relative magnitude of the water vapour resistance of the product and that of an equally thick layer of stationary air at the same temperature 3.6 water vapour diffusion equivalent air layer thickness sd thickness of a motionless air layer which has the same water vapour resistance as the test specimen with the thickness d Note 1 to entry: A conversion table and units for the above definitions are given in Annex A. 4 Principle The test specimen is sealed to the open side of a test dish containing a desiccant or an aqueous saturated salt solution. The assembly is then placed in a test atmosphere whose temperature and humidity are controlled. Because of the difference between the partial water vapour pressures in the test assembly and in the test atmosphere water vapour flows through the test specimen. Periodic weighings of the assembly are conducted to determine the rate of water vapour transmission when the steady state is reached. 5 Apparatus 5.1 Test dishes, preferably of circular shape and which are (corrosion) resistant to any desiccant or to the salt solution which they may be required to contain and impermeable to water or water vapour.
These dishes are typically made of glass or metal. The size of the dishes depends on the size of the test specimen to be tested. The difference in size between the upper exposed area (A1) and the lower exposed area (A2) of the test specimen shall be less than 3 % (see examples in Annex B). Some types of test dish are unsuitable for use with certain materials. This should be stated in the relevant product standard or any other European Technical Specification. 5.2 Measuring instruments, capable of determining linear dimensions in accordance with EN 12085. 5.3 Template (with edge tapered to facilitate removal after use) with a shape and size corresponding to that of the test dish to duplicate the exposed area of the specimen.
The template shall have an area that is at least 90 % of the test specimen's surface in order to limit the edge effect due to non-linear vapour flow (see Annex C). 5.4 Analytical balance, capable of weighing the test assembly to an accuracy of ± 1 mg or better.
If larger test assemblies are used, the weighing accuracy may be determined with respect to the total weight and the required accuracy of the test results. 5.5 Chamber, capable of being maintained within ± 3 % of the required relative humidity and within ± 1 °C of the required temperature. In order to
...

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Wärmedämmstoffe für das Bauwesen - Bestimmung der WasserdampfdurchlässigkeitProduits isolants thermiques destinés aux applications du bâtiment - Détermination des propriétés de transmission de la vapeur d'eauThermal insulating products for building applications - Determination of water vapour transmission properties91.100.60Thermal and sound insulating materialsICS:Ta slovenski standard je istoveten z:FprEN 12086kSIST FprEN 12086:2012en,fr,de01-september-2012kSIST FprEN 12086:2012SLOVENSKI
STANDARD



kSIST FprEN 12086:2012



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
FINAL DRAFT
FprEN 12086
June 2012 ICS 91.100.60 Will supersede EN 12086:1997English Version
Thermal insulating products for building applications - Determination of water vapour transmission properties
Produits isolants thermiques destinés aux applications du bâtiment - Détermination des propriétés de transmission de la vapeur d'eau
Wärmedämmstoffe für das Bauwesen - Bestimmung der Wasserdampfdurchlässigkeit This draft European Standard is submitted to CEN members for unique acceptance procedure. It has been drawn up by the Technical Committee CEN/TC 88.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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, 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.
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.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. FprEN 12086:2012: EkSIST FprEN 12086:2012



FprEN 12086:2012 (E) 2 Contents Page Foreword .31Scope .52Normative references .53Terms and definitions .54Principle .65Apparatus .66Test specimens .77Procedure .88Calculation and expression of results .99Accuracy of measurement . 1210Test report . 12Annex A (informative)
Conversion table for water vapour transmission units . 14Annex B (informative)
Examples of test assemblies . 15Annex C (informative)
Information about correction procedures . 16Bibliography . 17 kSIST FprEN 12086:2012



FprEN 12086:2012 (E) 3 Foreword This document (FprEN 12086:2012) has been prepared by Technical Committee CEN/TC 88 “Thermal insulating materials and products”, the secretariat of which is held by DIN. This document is currently submitted to the Unique Acceptance Procedure. This document will supersede EN 12086:1997.
The revision of this standard contains no major changes only minor corrections and clarifications of editorial nature. This European Standard is one of a series of standards which specify test methods for determining dimensions and properties of thermal insulating materials and products. It supports a series of product standards for thermal insulating materials and products which derive from the Council Directive of 21 December 1988 on the approximation of laws, regulations and administrative provisions of the Member States relating to construction products (Directive 89/106/EEC) through the consideration of the essential requirements. This European Standard has been drafted for applications in buildings but it may also be used in other areas where it is relevant. This EN test standard is one of the following group of inter-related standards on test methods for determining dimensions and properties of thermal insulation materials and products, all of which come within the scope of CEN/TC 88: EN 822, Thermal insulating products for building applications — Determination of length and width EN 823, Thermal insulating products for building applications — Determination of thickness EN 824, Thermal insulating products for building applications — Determination of squareness EN 825, Thermal insulating products for building applications — Determination of flatness EN 826, Thermal insulating products for building applications — Determination of compression behaviour EN 1602, Thermal insulating products for building applications — Determination of the apparent density EN 1603, Thermal insulating products for building applications — Determination of dimensional stability under constant normal laboratory conditions (23 °C/50 % relative humidity) EN 1604, Thermal insulating products for building applications — Determination of dimensional stability under specified temperature and humidity conditions EN 1605, Thermal insulating products for building applications — Determination of deformation under specified compressive load and temperature conditions EN 1606, Thermal insulating products for building applications — Determination of compressive creep EN 1607, Thermal insulating products for building applications — Determination of tensile strength perpendicular to faces EN 1608, Thermal insulating products for building applications — Determination of tensile strength parallel to faces kSIST FprEN 12086:2012



FprEN 12086:2012 (E) 4 EN 1609, Thermal insulating products for building applications — Determination of short term water absorption by partial immersion EN 12085, Thermal insulating products for building applications — Determination of linear dimensions of test specimens EN 12086, Thermal insulating products for building applications — Determination of water vapour transmission properties EN 12087, Thermal insulating products for building applications — Determination of long term water absorption by immersion EN 12088, Thermal insulating products for building applications — Determination of long term water absorption by diffusion EN 12089, Thermal insulating products for building applications — Determination of bending behaviour EN 12090, Thermal insulating products for building applications — Determination of shear behaviour EN 12091, Thermal insulating products for building applications — Determination of freeze-thaw resistance EN 12429, Thermal insulating products for building applications — Conditioning to moisture equilibrium under specified temperature and humidity conditions EN 12430, Thermal insulating products for building applications — Determination of behaviour under point load EN 12431, Thermal insulating products for building applications — Determination of thickness for floating floor insulating products EN 13793, Thermal insulating products for building applications — Determination of behaviour under cyclic loading EN 13820, Thermal insulating products for building applications — Determination of organic content
kSIST FprEN 12086:2012



FprEN 12086:2012 (E) 5 1 Scope This European Standard specifies the equipment and procedures for determining the water vapour transmission rate, water vapour permeance and water vapour permeability of test specimens in the steady state under different sets of specified test conditions. It is applicable to thermal insulating products. It is intended to be used for homogeneous materials (see note 1) and for products which may contain integral skins or facings of different material(s). NOTE 1 A material is considered to be homogeneous, with regard to mass distribution, if its density is approximately the same throughout, i.e. if the measured density values are close to its mean density. NOTE 2 This test method is not normally used for determining the water vapour transmission properties of single, separate vapour barriers (of high diffusion resistance), such as prefabricated films, foils, membranes or sheets, due to the long duration of the test. For products with a vapour retarder or barrier with a water vapour diffusion equivalent air layer thickness sd ≥ 1 000 m (see 3.6) other test methods e.g. IR-detection can be used for measuring the single separate vapour retarder or barrier, provided that the results obtained are in the same range as the values measured in accordance with this standard. The water vapour transmission rate and permeance values are specific to the test specimen (i.e. the product) thickness tested. For homogeneous products, the water vapour permeability is a property of the material. 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. EN 12085, Thermal insulating products for building applications — Determination of linear dimensions of test specimens 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 water vapour transmission rate g quantity of water vapour transmitted through unit area in unit time under specified conditions of temperature, humidity and thickness 3.2 water vapour permeance W quotient of the water vapour transmission rate of the test specimen and the water vapour pressure difference between the two specimen faces during the test 3.3 water vapour resistance Z inverse of water vapour permeance 3.4 water vapour permeability δ product of the permeance and the thickness of the test specimen kSIST FprEN 12086:2012



FprEN 12086:2012 (E) 6 Note 1 to entry: The water vapour permeability of a homogeneous product is a property of the material. It is the quantity of water vapour transmitted per unit of time through a unit area of the product per unit of vapour pressure difference between its faces for a unit thickness. 3.5 water vapour diffusion resistance factor µ quotient of the water vapour permeability of air and the water vapour permeability of the material or the homogeneous product concerned; it indicates the relative magnitude of the water vapour resistance of the product and that of an equally thick layer of stationary air at the same temperature 3.6 water vapour diffusion equivalent air layer thickness sd thickness of a motionless air layer which has the same water vapour resistance as the test specimen with the thickness d Note 1 to entry: A conversion table and units for the above definitions are given in Annex A. 4 Principle The test specimen is sealed to the open side of a test dish containing a desiccant or an aqueous saturated salt solution. The assembly is then placed in a test atmosphere whose temperature and humidity are controlled. Because of the difference between the partial water vapour pressures in the test assembly and in the test atmosphere water vapour flows through the test specimen. Periodic weighings of the assembly are made to determine the rate of water vapour transmission when the steady state is reached. 5 Apparatus 5.1 Test dishes, preferably of circular shape and which are (corrosion) resistant to any desiccant or to the salt solution which they may be required to contain and impermeable to water or water vapour. These dishes are typically made of glass or metal. The size of the dishes depends on the size of the test specimen to be tested. The difference in size between the upper exposed area (A1) and the lower exposed area (A2) of the test specimen shall be less than 3 % (see examples in Annex B). NOTE Some types of test dish are unsuitable for use with certain materials. This should be stated in the relevant product standard or any other European technical specification. 5.2 Measuring instruments, capable of determining linear dimensions in accordance with EN 12085. 5.3 Template (with edge tapered to facilitate removal after use) with a shape and size corresponding to that of the test dish to duplicate the exposed area of the specimen. The template shall have an area that is at least 90 % of the test specimen's surface in order to limit the edge effect due to non-linear vapour flow (see Annex C). 5.4 Analytical balance, capable of weighing the test assembly to an accuracy of ± 1 mg or better. If larger test assemblies are used, the weighing accuracy may be determined with respect to the total weight and the required accuracy of the test results. 5.5 Chamber, capable of being maintained within ± 3 % of the required relative humidity and within ± 1 °C of the required temperature. NOTE In order to maintain the required conditions throughout the chamber it may be necessary to use air circulation with an air speed of between 0,02 to 0,3 m/s. If a non-injection type humidity chamber is used, saturated salt solutions may then be used.
5.6 Sealant, unaffected by test conditions. The following are exampl
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