SIST EN 1279-4:2004

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Steklo v stavbah - Izolacijski stekleni elementi - 4. del: Preskusne metode za fizikalne lastnosti robnih tesnilGlas im Bauwesen - Mehrscheiben-Isolierglas - Teil 4: Verfahren zur Prüfung der physikalischen Eigenschaften des RandverbundesVerre dans la construction - Vitrage isolant préfabriqué scellé - Partie 4 : Méthodes d'essai de propriétés physique des produits de scellementGlass in building - Insulating glass units - Part 4: Methods of test for the physical attributes of edge seals81.040.20Steklo v gradbeništvuGlass in buildingICS:Ta slovenski standard je istoveten z:EN 1279-4:2002SIST EN 1279-4:2004en01-september-2004SIST EN 1279-4:2004SLOVENSKI
STANDARD



SIST EN 1279-4:2004



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1279-4July 2002ICS 81.040.20English versionGlass in building - Insulating glass units - Part 4: Methods of testfor the physical attributes of edge sealsVerre dans la construction - Vitrage isolant préfabriquéscellé - Partie 4: Méthodes d'essai des propriétésphysiques des produits de scellementGlas im Bauwesen - Mehrscheiben-Isolierglas - Teil 4:Prüfmethoden der physikalischen Eigenschaften desRandverbundesThis European Standard was approved by CEN on 5 March 2002.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards 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 translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2002 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1279-4:2002 ESIST EN 1279-4:2004



EN 1279-4:2002 (E)2ContentpageForeword 31 Scope 32Normative references 43Terms, definitions and symbols 54Requirements 55Test methods 86 Test report13Annex A (normative) Test specimens for adhesion test14Annex B (normative) Requirement for edge seal strength comparisons in case ofsubstituting sealant17Annex C (normative) Method of moisture vapour transmission rate measurement18Annex D (normative) Adhesion on coatings and interlayer adhesion of coatings22Annex E (informative) Informative tests27Annex F (informative) Example of a sun simulating radiation source28Bibliography29SIST EN 1279-4:2004



EN 1279-4:2002 (E)3ForewordThis document EN 1279-4:2002 has been prepared by Technical Committee CEN/TC 129"Glass in building", the secretariat of which is held by IBN.This European Standard shall be given the status of a national standard, either by publicationof an identical text or by endorsement, at the latest by January 2003, and conflicting nationalstandards shall be withdrawn at the latest by January 2003.The described testing is part of type evaluation of insulating glass units.This Part of the standard does not stand alone, it is part of one standard:–prEN 1279-1, Glass in building - Insulating glass units - Part 1: Generalities, dimensionaltolerances and rules for the system description.–prEN 1279-2, Glass in building - Insulating glass units - Part 2: Long term test methodand requirements on moisture vapour penetration.–prEN 1279-3, Glass in building - Insulating glass units - Part 3: Long term test methodand requirements for gas leakage rate and for gas concentration tolerances.–EN 1279-4, Glass in building - Insulating glass units - Part 4: Methods of test for thephysical attributes of edge seals.–prEN 1279-5, Glass in building - Insulating glass units - Part 5: Evaluation of conformity.–EN 1279-6, Glass in building - Insulating glass units - Part 6: Factory production controland periodic tests.The annexes A, B, C and D are normative. The annexes E and F are informative.This standard includes a Bibliography.According to the CEN/CENELEC Internal Regulations, the national standards organizationsof the following countries are bound to implement this European Standard: Austria, Belgium,Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and theUnited Kingdom.1ScopeThis European Standard is the product standard for insulating glass units, which definesinsulating glass units, and ensures by means of an adequate evaluation of conformity to thisstandard that over time:–energy savings are made because the U-value and solar factor do not change significantly;–health is preserved because sound reduction and vision do not change significantly;–safety is provided because mechanical resistance does not change significantly.It covers additional characteristics that are of importance for trade. Marking conditions areincluded.SIST EN 1279-4:2004



EN 1279-4:2002 (E)4For glass products with electrical wiring or connections for e.g. alarm or heating purposes,this standard covers only wiring subject for electrical potential difference to earth less than50 V a.c. or less than 75 V d.c.The main intended uses of the insulating glass units are installations in buildings andconstructions such as in windows, doors, curtain walling, roofs and partitions where thereexists protection against direct ultraviolet radiation at the edges.NOTE 1
In cases where there is no protection against direct ultraviolet radiation at the edges, such as structuralsealant glazing systems, additional European technical specifications should be followed. See Bibliography [4]and [5].NOTE 2
Units where the nature is only artistic are not part of this standard.This European Standard, which is inextricably bound up with the other Parts of the standard,covers evaluation of the edge seal strength, and partial evaluation of moisture and gaspermeation through sealants, by testing and/or report examination as means of verifyingwhether a product made in accordance with its system description, and its variations inaccordance with prEN 1279-1, conforms with the relevant aspects of the definition ofinsulating glass units.2Normative referencesThis European Standard incorporates, by dated or undated reference, provisions from otherpublications. These normative references are cited at the appropriate places in the text and thepublications are listed hereafter. For dated references, subsequent amendments to or revisionsof any of these publications apply to this European Standard only when incorporated in it byamendment or revision. For undated references, the latest edition of the publication referredto applies (including amendments).EN 410, Glass in building - Determination of luminous and solar characteristics of glazing.EN 1096, Glass in building - Coated glass.prEN 1279-1, Glass in building - Insulating glass units - Part 1: Generalities, dimensionaltolerances and rules for the system description.prEN 1279-2, Glass in building - Insulating glass units - Part 2: Long term test method andrequirements on moisture vapour penetration.prEN 1279-3, Glass in building - Insulating glass units - Part 3: Long term test method andrequirements for gas leakage rate and for gas concentration tolerances.EN 1279-6, Glass in building - Insulating glass units - Part 6: Factory production controland periodic tests.SIST EN 1279-4:2004



EN 1279-4:2002 (E)53Terms, definitions and symbols3.1Terms and definitionsFor the purposes of this European Standard, the terms and definitions of prEN 1279-1, prEN1279-2, prEN 1279-3 and EN 1279-6 apply as well as the following terms and definitions.3.1.1moisture vapour transmission ratesteady moisture vapour flow in unit time through unit area of a body, normal to specificparallel surfaces, under specific conditions of temperature and humidity at each surface3.1.2standard room conditionsambient temperature of (23 ± 2) °C and a relative humidity of (50 ± 5) % r.h3.2SymbolseExtension of bond expressed as a percentsStress applied to the bond during extensionDPH2ODifference in water vapour pressure across a membrane4Requirements4.1Edge seal strengthAll edge seals shall have sufficient adhesive and cohesive strength to allow the joints asspecified to be extended such that any failure occurs outside the area OAB of Figure 1.If during the strength test of the glass-sealant-glass joint, seen from the side view, loss ofadhesion or cohesion extends through the whole depth of the sealant within the area OAB ofFigure 1, then the sealant test specimen has failed (see Figure 2). The principle of lighttransmission through the defect can be applied to determine pass or failure.Breakage of the glass during testing does not constitute failure, providing that sufficientsuccessful joints are tested in order that the average result can be obtained.For comparisons of seal strength, needed for substituting sealants, refer to annex B.SIST EN 1279-4:2004



EN 1279-4:2002 (E)6Key1 Area OAB. In that area, no breakage allowed before and after ageings
Stress in the sealante
Strain in the sealantFigure 1 - Stress/strain triangleKey1 Loss of cohesion2 Loss of adhesionFigure 2 - Illustration of loss of adhesion or cohesion extends through the whole depth4.2Conformity with the definition of insulating glass units4.2.1GeneralThere shall be available a test report of the concerned insulating glass outer sealant accordingto clause 6 of this EN 1279-4:2002 (which summarizes the test report in which the edge sealstrength is recorded) with a moisture penetration test report according toprEN 1279-2 and in case of gas-filled units also with a gas leakage rate report according toprEN 1279-3, and fulfills the requirement to demonstrate the conformity with the definitionof insulating glass units. Refer to prEN 1279-1.In case of sealing the insulating glass unit also on a coating (in accordance with EN 1096) notintended to be stripped, a test report according to annex D of this EN 1279-4:2002 shall bemade available for inclusion in the assembling of the other test reports. Refer toprEN 1279-1.SIST EN 1279-4:2004



EN 1279-4:2002 (E)7NOTE
Although only clear float glass is referred to in the standard, it is the responsibility of the insulatingglass manufacturer to ensure that the edge sealant is capable of bonding to all used glasses listed inprEN 1279-1. The requirements for the use of coated glasses in accordance with EN 1096, are detailed inannex D.4.2.2Possibility to substitute the sealant4.2.2.1Limits of applicationThis possibility is applicable only in the case of insulating glass units with hollow metalspacer. For other systems, no experience is available for the setting up of substitution rules.Refer also to prEN 1279-1.4.2.2.2Air filled insulating glass unitsAvailable test reports according to clause 6 of this EN 1279-4:2002 allows for thesubstitution of the sealant without repeated moisture penetration testing according to prEN1279-2, when the substituting sealant:(a)for units with an I value below 0,1:–shall be applicable with the same production equipment;–has been previously applied in insulating glass units which have been demonstrated tocomply with prEN 1279-2. The demonstrated compliance may have been obtainedseparately using units of different construction and therefore the test report numbers mayvary;–and the moisture vapour transmission rate of the sealant is not more than 20 % higherthan that of the initial sealant;–and the stress/strain curve comparison satisfies the requirement in annex B;–and the relevant Parts of EN 1279-6 (periodic test, mixing ratio, hardness test, etcetera)shall be carried out.(b)for units with an I value between 0,1 and 0,2: the list under a) applies however with thefollowing deviation:–the moisture vapour transmission rate through membrane of the substitute sealant shall bethe same or lower than the initial sealant.4.2.2.3Gas filled insulating glass unitsAvailable test reports according to clause 6 of this EN 1279-4:2002 allows to substitute thesealant without repeated gas loss rate testing according to prEN 1279-3, when the substitutingsealant:(a)for units with a gas loss rate Li below 0,8 %a-1:–is allowed for limiting the moisture vapour penetration in accordance with 4.2.2.2;–has been previously applied in insulating glass units which have been demonstrated tocomply with prEN 1279-3. The demonstrated compliance may have been obtainedSIST EN 1279-4:2004



EN 1279-4:2002 (E)8separately using units of different construction and therefore the test report numbers mayvary;–and the gas permeation of the sealant is not more than 20 % higher than that of the initialsealant.(b)for units with a gas loss rate Li between 0,8 %a-1 and 1,0 %a-1: the list under a) applieshowever with the following deviation:–and the gas permeation of the substitute sealant shall be the same or lower than the initialsealant.4.2.3Possibility of substitute the coated glass, coatings not intended to be removedAvailable test reports according to annex D of this EN 1279-4:2002 allow for the substitutionof
the coated glasses (coated glass in accordance with EN 1096), coating not intended to bestripped from the area where the insulating glass will be sealed without repeated moisturepenetration testing according to prEN 1279-2, and in case of gas-filled units without repeatedgas loss rate testing according to prEN 1279-3, when the provisions set out in the annex D arefollowed. Refer also to prEN 1279-1.5Test methods5.1Adhesion5.1.1PrincipleThe test consists of preparing a number of glass-sealant-glass joints and subjecting them toageing regimes as outlined in 5.1.2 of this EN 1279-4:2002:–heat exposure,–water immersion,–UV exposure,as well as to no ageing (initial test) before testing under tensile load.The test specimen shapes and bond preparations shall be as given in normative annex A. Forinsulating glass units with systems which cannot apply annex A, the test specimen shall be50 mm cut from the edge seal of an insulating glass unit. The shape of the samples shall be assimilar as possible. Their cross sections shall have a cross section as near as possible to thetest specimen described in annex A. The number of joints are seven per exposure condition.SIST EN 1279-4:2004



EN 1279-4:2002 (E)9Manufacturing test specimenby manufacturer or bylaboratory21 days at least: curing at standard room conditionsWhen necessary transport from manufacturing site to test site7 days at least: conditioning at standard room conditionsAgeing24 h to 48 h: conditioning at standard room conditionsTensile testsCalculation and presentationof test resultsFigure 3 - Schematic presentation of test order for adhesion - Flow from top to bottomAfter manufacturing, ageing where relevant, and conditioning during 24 h to 48 h at standardroom conditions the test specimens shall be measured accurately for width, depth and heightprior to being placed in an extensiometer with an accuracy equal to or lower than 2 %.The speed of separation is in case of polymer based edge sealants (5 ± 0,25) mm/min, and incase of metallic edge seals (12,5 ± 0,5) mm/min. See Figure 3 for the schematic presentationof the order of the preparation and tests.Where the glass continuously breaks a bond stiffener can be bonded to the glass immediatelyprior to testing but after ageing. Stiffening can be accomplished by addition of a second pieceof glass or other material bonded e.g. with a cyano acrylate adhesive.5.1.2Calculation of stress and expression of resultsThe stresses are calculated from the mean of the contact areas between the sealant and theglass in one test specimen. In case of metal seal, the contact area is fixed on 100 mm² (seeFigure A.2).The results are expressed in average values of the stress and strain when the stress/straincurves cross the line AB of Figure 1. The highest and lowest values are ignored so that theaverage values are calculated on the five remaining measured stress and strain values.SIST EN 1279-4:2004



EN 1279-4:2002 (E)105.1.3Procedures5.1.3.1Initial cure testAfter initial cure (see annex A) and conditioning at standard room conditions of at least sevendays, seven test specimens not subjected to any ageing regime are subjected to tensile load.5.1.3.2Heat exposureAfter initial cure and conditioning at standard room conditions of at least seven days, theseven test specimens for heat ageing shall be aged in a closed oven at (60 ± 2) °C for(168 ± 5) h. Where the sealant shows plastic flow at 60 °C the spacers shall be retainedbetween the two glass pieces to prevent bond deformation.5.1.3.3Water immersionAfter initial cure and conditioning at standard room conditions of at least seven days, allseven test specimens for water immersion shall be immersed in one litre to two litres distilledor deionised water for (168 ± 5) h, at standard room condition. Fresh new water shall be usedfor each test. The conductance of the fresh water shall be equal to or less than 30 µS.5.1.3.4UV exposureAfter initial cure and conditioning at standard room conditions of at least seven days, seventest specimens for UV exposure shall be subject (96 ± 4) h to UV irradiation which shall beperpendicular to the glass at an intensity in the UVA range in accordance with EN 410 of (40± 5) W/m². Refer to Figure 3 for the radiation orientation and to annex F for an example of aUV radiation source.The height of the UV source shall be adjusted to ensure all joint assemblies are subject to theminimum intensity.The irradiation intensity shall be measured at the beginning and end of each test. When theminimum irradiation can no longer be achieved a new UV source shall be installed.SIST EN 1279-4:2004



EN 1279-4:2002 (E)11Ultraviolet radiationKey1
Clear float glass2
Tested surface which can be coatedFigure 4 - Orientation of the surface to be tested to the ultraviolet radiation5.2Moisture vapour transmission rateThe information on the moisture vapour transmission rate is only requested when sealantcomparisons are made for the purpose of change.5.2.1PrincipleThe moisture vapour transmission rate (MVTR), when undertaken shall be determined on a2 mm thick film as outlined in 5.2.2 of this EN 1279-4:2002.5.2.2Procedure5.2.2.1Film preparationIt is advisable to prepare films from the dispensing machines used by the insulating glass unitmanufacturer. Hand mixing or small scale heating, where appropriate, may give erraticresults.5.2.2.2Applicable testsThere is a wide variety of tests covering Moisture vapour transmission rate. They vary byfilm thickness, DPH2O across the film and temperature of test.For comparison the method defined in the normative annex C shall be used with thefollowing criteria:–film thickness shall be (2 ± 0,1) mm–test temperature shall be (23 ± 1) °C–DPH2O shall be from equal or less than 5 % (desiccant) to equal or more than 90 % r.h.(test chamber) across the membraneSIST EN 1279-4:2004



EN 1279-4:2002 (E)125.3Gas permeation test on filmThe information on the gas permeation is only requested when sealant comparisons are madefor the purpose of change.5.3.1PrincipleThis test is not relevant where the sealant manufacturer clearly states the sealant is notintended for use in gas filled insulating glass units.The gas permeation rate when undertaken shall be determined as a 2 mm thick film asoutlined in section 5.3.2 of this Part of the standard.5.3.2ProceduresThe gas permeation test shall be carried out using similar apparatus and the same testconditions to that defined in prEN 1279-3. In place of the test unit a gas cell shall beintroduced in the line using the film as a membrane. Argon gas shall be used as a test gas. Apressure not exceeding 10 mbar shall be applied to the test gas side of the film. Helium gasshall be used as carrier gas.The area shall be recorded and shall not be less than 10 cm². The shape can be circular aswell as square, and will be recorded. The value of gas permeating through the film when asteady state condition is achieved, shall be determined as g.m-2h-1.SIST EN 1279-4:2004



EN 1279-4:2002 (E)136Test reportThe test report shall evaluate the test in detail and shall include the following summary:Name of the test house, its address and logoSummary of report n° ……………………….
Date: …………………….Insulating glass units - Seal properties results according to EN 1279-4For details, see the test reportCompany:
Name: ………………………………………………………………………………………….
Address: ………………………………………………………………………………………….
………………………………………………………………………………………….
………………………………………………………………………………………….
………………………………………………………………………………………….Plant:
Name: ………………………………………………………………………………………….
Address: ………………………………………………………………………………………….
………………………………………………………………………………………….
………………………………………………………………………………………….
………………………………………………………………………………………….Sealant specification: ……………………………………………………………………………………….Sealant in IGU positively tested according to prEN 1279-2, report n°: ……………………………….Glass specification when not float glass is used: ……………………………………………………….Seal strength testAt intersection with line A-B (EN 1279-4, Figure 1):Type of failureobserved (if any)Adhesion:Average stress savAverage extension eavC= cohesive
A = adhesivein MPain %12345Initial cureAfter water immersionAfter heating 60°CAfter UV radiationNOTE: It is recommended to include the stress/strain curves (informative test E.1) with this reportMoisture vapour transmission rate (when applicable for substituting sealant):
Film thickness
………. mm
DPH2O
………. % relative humidity difference across the membrane
Temperature
………. °C
MVTR
...