SIST EN 1279-2:2004

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Steklo v gradbeništvu - Izolacijski stekleni elementi - 2. del: Preskus tipa na izolacijskih steklenih elementih, polnjenih z zrakomGlas im Bauwesen - Mehrscheiben-Isolierglas - Teil 2: Langzeitprüfverfahren und Anforderungen bezüglich FeuchtigkeitsaufnahmeVerre dans la construction - Vitrage isolant préfabriqué scellé - Partie 2: Méthode d'essai de longue durée et exigences en matiere de pénétration d'humiditéGlass in building - Insulating glass units - Part 2: Long term test method and requirements for moisture penetration81.040.20Steklo v gradbeništvuGlass in buildingICS:Ta slovenski standard je istoveten z:EN 1279-2:2002SIST EN 1279-2:2004en01-september-2004SIST EN 1279-2:2004SLOVENSKI
STANDARD



SIST EN 1279-2:2004



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1279-2November 2002ICS 81.040.20English versionGlass in building - Insulating glass units - Part 2: Long term testmethod and requirements for moisture penetrationVerre dans la construction - Vitrage isolant préfabriquéscellé - Partie 2: Méthode d'essai de longue durée etexigences en matière de pénétration d'humiditéGlas im Bauwesen - Mehrscheiben-Isolierglas - Teil 2:Langzeitprüfverfahren und Anforderungen bezüglichFeuchtigkeitsaufnahmeThis European Standard was approved by CEN on 5 September 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 1279-2:2002 ESIST EN 1279-2:2004



EN 1279-2:2002 (E)2ContentspageForeword.31Scope.42Normative references.43Terms and definitions, abbreviations and symbols.53.1Terms and definitions.53.2Abbreviations.53.3Symbols.54Requirements.64.1Moisture penetration index.64.2Edge seal strength.64.3Gas leakage rate.65Method of test.75.1Principle.75.2Climate conditions in cabinet.75.3Number, description and selection of the test specimens.95.4Procedure.106Methods of measurement.116.1Measurement of dew point temperature.116.2Measurement of moisture content.116.2.1General.116.2.2Moisture content of desiccant in bulk.116.2.3Moisture content of desiccant incorporated in organic spacer.126.2.4Moisture content in insulating glass units without desiccant.127Test report.14Annex A (normative)
Reference method for dew point temperature measurement.15A.1General.15A.2Apparatus and materials.15A.3Procedure.15Annex B (normative)
Moisture content measurement according to the 950 °C drying method.17B.1Applicability.17B.2Apparatus, materials and preparatory work.17B.3Initial and final moisture content.18B.4Standard moisture adsorption capacity.20Annex C (normative)
Moisture content measurement according to the Karl Fischer method.21C.1Applicability.21C.2Apparatus, materials and preparatory work.21C.3Initial and final moisture content.22C.4Standard moisture adsorption capacity.25Annex D (normative)
Establishing the standard moisture adsorption capacity of desiccants.27D.1General.27D.2Appropriate information.27D.3Generally accepted values for desiccant in bulk.28D.4Desiccant manufacturing.28Bibliography.29SIST EN 1279-2:2004



EN 1279-2:2002 (E)3ForewordThis document (EN 1279-2:2002) has been prepared by Technical Committee CEN/TC 129 "Glass in building", thesecretariat of which is held by IBN.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by May 2003, and conflicting national standards shall be withdrawn at the latest byMay 2003.The described testing is part of type evaluation of insulating glass units.This European Standard “Glass in Building - Insulating glass units” consists of the following Parts:–Part 1: Generalities, dimensional tolerances and rules for the system description.–Part 2: Long term test method and requirements for moisture penetration.–Part 3: Long term test method and requirements for gas leakage rate and for gas concentration tolerances.–Part 4: Methods of test for the physical attributes of edge seals.–Part 5: Evaluation of Conformity.–Part 6: Factory production control and periodic tests.The annexes A to D are normative.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries 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 the United Kingdom.SIST EN 1279-2:2004



EN 1279-2:2002 (E)41 ScopeThis European Standard specifies requirements for moisture penetration and the long term test method forinsulating glass units and ensures by means of an adequate evaluation of conformity to this standard that overtime:–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 are included.For glass products with electrical wiring or connections for e.g. alarm or heating purposes, this standard coversonly wiring subject for electrical potential difference to earth less than 50 V a.c. or less than 75 V d.c.The main intended uses of the insulating glass units are installations in buildings and constructions such as inwindows, doors, curtain walling, roofs and partitions where there exists protection against direct ultraviolet radiationat the edges.NOTE 1In cases where there is no protection against direct ultraviolet radiation at the edges, such as structural sealantglazing systems, additional European technical specifications should be followed.NOTE 2Units where the nature is only artistic are not part of this standard.This Part of this standard, which is inextricably bound up with the other Parts of this standard, covers the moisturepenetration by testing as one means of verifying whether a product made in accordance with its system descriptionconforms with the relevant aspect of the definition on insulating glass units.2 Normative referencesThis European Standard incorporates, by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text, and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated by amendment or revision. For undated references, the latest edition of thepublication referred to applies (including amendments).EN 572-1, Glass in Building - Basic soda lime silicate glass products - Part 1: Definitions and general physical andmechanical properties.EN 572-2, Glass in Building - Basic soda lime silicate glass products - Part 2: Float glass.prEN 1279-1:1998, Glass in Building - Insulating glass units - Part 1: Generalities, dimensional tolerances and rulesfor the system description.EN 1279-3, Glass in Building - Insulating glass units - Part 3: Long term test method and requirements for gasleakage rate and for gas concentration tolerances.EN 1279-4, Glass in Building - Insulating glass units - Part 4: Methods of test for the physical attributes of edgeseals.ISO 760, Determination of water - Karl Fischer method (General method).SIST EN 1279-2:2004



EN 1279-2:2002 (E)53 Terms and definitions, abbreviations and symbols3.1 Terms and definitionsFor the purposes of this European Standard, the terms and definitions given in prEN 1279-1:1998 together with thefollowing apply.3.1.1 standard laboratory conditionsambient temperature of (23 ± 2) °C and a relative humidity of (50 ± 5) %3.1.2 standard moisture adsorption capacitycapacity of a desiccant material to adsorb a quantity of moisture under controlled limit environment conditions3.1.3 controlled limit environment conditionsenvironment temperature 10 °C with a dew point temperature of - 5 °C, giving a relative humidity of 32,8 %3.1.4 moisture penetration indexamount of drying capacity consumed after standardised ageing conditions3.1.5 accuracyprecision of the test method itself within confidence limits of 99 %3.2 Abbreviationsr.h.relative humidity3.3 SymbolsIMoisture penetration index (can be expressed in decimal or in percentage terms);IavAverage value of the moisture penetration indices I, obtained over five measurements;moMass of dish when empty, clean and dry;mcMass of dish plus desiccant plus water adsorbed from r.h. of 32 % air;mfMass of dish plus desiccant plus water initially adsorbed plus water adsorbed when subjected to the climateconditions in the cabinet;miMass of dish plus desiccant plus water initially adsorbed;mrMass of dish plus desiccant plus water adsorbed in equilibrium with a defined reference level of relativehumidity of air, or dish plus dried desiccant at high temperatures;MmMass of desiccant in mixtures with non-desiccant material;MtTotal mass of desiccant when, for the purpose of testing, in a mixture with non-desiccant material, the non-desiccant material is replaced by the same volume of desiccant;RRatio between the masses of desiccant Mm and Mt ;SIST EN 1279-2:2004



EN 1279-2:2002 (E)6TcStandard moisture adsorption capacity of desiccant;Tc,avAverage standard moisture adsorption capacity of desiccant Tc obtained over two measurements;TfFinal moisture content of desiccant;Tf,u Uncorrected final moisture content of desiccant;TiInitial moisture content of desiccant;Ti,avAverage initial moisture content of desiccant Ti obtained over four measurements;Ti,u Uncorrected initial moisture content of desiccant;QTemperature of test specimens in test cabinet;QcTemperature of the central test specimen in test cabinet during constant temperature phase;QhHigh temperature of the central test specimen in the test cabinet during the high humidity/temperature cyclingphase;QlLow temperature of the central test specimen in the test cabinet during the high humidity/temperature cyclingphase;QsTemperature of the central test specimen in the test cabinet as the cycle moves between high temperatureand low temperature and vice versa.4 Requirements4.1 Moisture penetration indexInsulating glass units shall fulfil their functions during an economically reasonable working life. Therefore thefollowing values are verified on test specimens submitted to the climate test described in this Part of the standard:The average moisture penetration index Iav over the five test specimen shall not exceed 0,20.Although breakage of the glass does not constitute failure, the average moisture penetration index Iav shall be theaverage over not less than, and no more than, five units. Spare units shall be used instead of the broken testspecimens.The unit with the highest moisture penetration index shall have an index value I not exceeding 0,25.4.2 Edge seal strengthFor the requirements on edge seal strength, refer to EN 1279-4.4.3 Gas leakage rateWhen the system description includes gas-filled insulating glass units, for additional testing and requirements ongas leakage rate, refer to EN 1279-3.SIST EN 1279-2:2004



EN 1279-2:2002 (E)75 Method of test5.1 PrincipleSets of insulating glass units are exposed to a climate test. The initial and final dew point and the initial and finalmoisture content, as applicable, are measured and the moisture penetration index is calculated.5.2 Climate conditions in cabinetThe high humidity/temperature test procedure consists of two parts. The climate condition in the cabinet comprisesas a first part 56 temperature cycles of 12 h from -18 °C to +53 °C with slopes of 14 °C/h, followed by a second partcomprising constant temperature of +58 °C for seven weeks. High humidity shall be as described.The exact specifications of the temperature, humidity and time, and their tolerances, are given in Figures 1 and 2.Key156 temperature cycles of 12 h (is four weeks)2Interval of 2 h to 4 h for moving test pieces from one cabinet to a second cabinet when two cabinets are used3(1176 ± 4) h (seven weeks) constant temperature and a relative humidity of r.h. ³ 95 %. Condensation on testspecimen is allowedFigure 1 — Overview of climate conditions in cabinet. QQ is the glass temperature of the centrally locatedtest specimen - Temperature cycles start with the cooling partSIST EN 1279-2:2004



EN 1279-2:2002 (E)8Key1Relative humidity during temperature cycle. Top value of r.h. ³ 95 %. During the cold part of the cycle, the highhumidity is interrupted. Condensation on test specimen from time to time is allowed.–Time intervals:t1 = 5 h,
t2 = 1 h,
t3 = 5 h,
t4 = 1 h,
t5 = total cycle time 12 h ;–Tolerance on time intervals: less than 1 min;–Temperatures of the centrally located test specimen during cycle:–Q h = (53,0 ± 1,0) °C (high temperature);–Q l = (-18,0 ± 1,0) °C (low temperature);–Q s = (14 ± 2) °C/h (slopes).Figure 2 — Temperature/time and humidity/time relations in cycling stageNOTEThe two parts of the process can be carried out in a single cabinet or in two separate cabinets. If two cabinets areused allow up to 4 h for moving the test specimens from one to the other for the second period.The indicated temperatures and temperature tolerances in Figures 1 and 2 are valid for the glass of that unit whichis centrally located in the cabinet(s). The temperature of that centrally located test specimen shall be recordedcontinuously. Also the relative humidity and air temperature, measured at the most suitable location in the testcabinet(s) shall be recorded continuously. Any deviations in temperature and in relative humidity will be noted in thetest report.The glass temperatures of the other test specimens in the cabinet shall be:–during cycling:· high temperatureQ = (Qh ± 1,0) °C;· low temperatureQ = (Ql
± 2,0) °C;SIST EN 1279-2:2004



EN 1279-2:2002 (E)9· slopesQ = (Qs ± 2,0) °C/h;–during constant temperature:Q = (Qc ± 0,5) °C.In order to maximize uniform climate conditions throughout the cabinet(s), the distance between the verticallyplaced test specimens shall not be less than 15 mm.5.3 Number, description and selection of the test specimensA set of insulating glass units consists of 15 test pieces. The test specimens shall be representative of the systemdescription (see prEN 1279-1) and shall consist of two panes of 4 mm clear float glass in accordance withEN 572-1 and EN 572-2. The length shall be (502 ± 2) mm and the width (352 ± 2) mm. The gap shall be 12 mm,or if not manufactured, a gap as near to 12 mm as possible. The cavity is preferably air filled, but other gases mayalso be used. Construction details of the edges and corners shall correspond to the edge and corner details in unitssupplied to the market.When the system description contains curved insulating glass units with a bending radius equal to or less than 1 m,the test pieces shall be curved as described in prEN 1279-1.When the system provides a mixture of desiccant with a non-desiccant material, incapable of resisting 1 000 °C,the Karl Fischer method shall be used for determining the moisture contents (after verifying the method forapplicability), or the non-desiccant material shall be replaced by the same volume of desiccant.When the system provides a mixture of desiccant with a non-desiccant material, incapable of withstanding 220 °C,the non-desiccant material shall be replaced by the same volume of desiccant.Following reception, condition 15 test specimens for two weeks minimum at standard laboratory conditions. Theinitial dew point temperatures of the test specimens, measured in accordance with 6.1, shall be within a range of10 K from the maximum dew point temperature as stated in, or to be derived from, information in themanufacturer's product/type description. Dew point temperatures less than -60 °C should be considered as -60 °C.Rank the test specimens in order of dew point value, commencing with the highest dew point value as number 1and ending with the lowest dew point as number 15. Number units with dew point values below -60 °C at random.Select the units as indicated in Table 1.Table 1 — Designation of insulating glass units in climate testsUnit numberDesignate units for:7, 8, 9 and 10Measurement of initial moisture content of desiccant (Ti)4, 5, 6,11 and 12Climate testing and measurement of final moisture content ofdesiccant (Tf)2, 3, 13 and 14Spare units to replace broken units for measurement of final moisturecontent of desiccant (Tf) (after climate testing)1 and 15Rejection or measurement of standard moisture adsorption capacityof desiccant (Tc) as requiredSIST EN 1279-2:2004



EN 1279-2:2002 (E)105.4 ProcedureWhen starting the climate test, measure the initial moisture content (Ti) of the desiccant (if any) on the four selectedtest specimens, in accordance with 6.2. Submit the five selected test specimens to the climate conditions, inaccordance with 5.2. For units without desiccant, measure the initial dew point temperature of the test specimens inaccordance with 6.1. This dew point temperature enables an equivalent value for Ti to be found in accordance with6.2.3.NOTE 1For reasons of time saving and cost aspects of this test, the manufacturer or his agent may decide whether the spareunits shall be submitted to climate conditions from the beginning, or only when a unit under climate conditions breaks.NOTE 2In order to be able to determine the requirement for the periodic test on moisture penetration, it is recommended thatparallel with this procedure the periodic moisture penetration test in accordance with EN 1279-6 is carried out.Store the units for a minimum of two weeks under standard laboratory conditions.Measure the final moisture content (Tf) of the desiccant (if any) of the five test specimens in accordance with 6.2.When the amount of desiccant in the test unit differs from the units placed on the market, the final moisture contentTf shall be corrected by the multipliertestinunitdesiccantndescriptiosystemperasdesiccantQQk_______=(1)whereQis amount of desiccant in weight or in volume.NOTE 3When there are technical reasons that the quantity of desiccant in the test pieces cannot be representative of thesystem description, the test can be performed with a different quantity, however test results have to be corrected in order toobtain a true I-value.For units without desiccant, measure the final dew point temperature of the test specimens in accordance with 6.1.This dew point temperature enables an equivalent value for Tf to be found in accordance with 6.2.4.Establish the standard moisture adsorption capacity (Tc) according to annex D. If necessary, measure the standardmoisture adsorption capacity of the desiccant on the rejected units in accordance with 6.2. In the case of unitswithout desiccant, find Tc in accordance with 6.2.4.Calculate the average initial moisture content of the desiccant from the following equation:TTavinn1144,,==å(2)When applicable, calculate the average standard moisture adsorption capacity of desiccant from the followingequation:TTcavcnn,,==å212(3)Calculate the moisture penetration index, in fractions or in percentage, of each of the five selected or designatedtest specimens subjected to the climate conditions, from the following equation:ITTTTfiavcaviav=--,,,
or
ITTTTfiavcaviav=--100,,, in %(4)SIST EN 1279-2:2004



EN 1279-2:2002 (E)11Calculate the average moisture penetration index from the following equation:IIavnn==å515(5)Insulating glass unit manufacturers should be aware of the accuracy of the test as evidenced by results fromproficiency testing. A proficiency test involving 10 laboratories, using the method detailed in this standard, hasdemonstrated that an accuracy, as defined in 3.1.4, better than ± 0,10 when the moisture penetration index I isexpressed as a ratio, or ± 10 % absolute when I is expressed as a percentage, can be achieved.6 Methods of measurement6.1 Measurement of dew point temperatureAny method is applicable when checked against the reference method given in annex A.6.2 Measurement of moisture content6.2.1 GeneralMoisture content values from different methods shall not be mixed.NOTEThere are three methods available for the moisture content measurements (Ti, Tf and Tc):–the 950 °C drying method: applicable for desiccant in bulk;–the Karl Fischer method: applicable for desiccant incorporated in organic sealing material;–the partial pressure method: applicable for units without desiccant.Although the final outcome, the moisture penetration index I, is independent of the method used, the moisturecontent values are not.6.2.2 Moisture content of desiccant in bulkWeigh an empty dish. Prepare and collect desiccant from each designated unit:–for the initial moisture content Ti, according to B.3;–for the final moisture content Tf, according to B.3;–for the standard moisture capacity Tc, according to B.4.Weigh the dish and desiccant. Dry desiccant according to B.2 and B.3. After cooling, weigh dish and desiccant.Calculate the moisture contents:–initial moisture content: according to equation (B.1);–final moisture content: according to equation (B.2) and eventual corrected value according to equation (B.4);–standard moisture adsorption capacity: according to equation (B.5).SIST EN 1279-2:2004



EN 1279-2:2002 (E)126.2.3 Moisture content of desiccant incorporated in organic spacerPrepare and collect organic spacer material containing desiccant, four samples, one from each side according toC.3, of each designated unit:–for the initial moisture content Ti according to C.3;–for the final moisture content Tf according to C.3;–for the standard moisture capacity Tc according to C.4.Weigh the samples. Determine the moisture contents by applying the Karl Fischer method according to annex C.NOTEThe method gives directly the moisture contents: Ti, Tf
or Tc.6.2.4 Moisture content in insulating glass units without desiccantWhen dew point temperature is measured in accordance with 6.1, find in Table 2 the corresponding water vapourpartial pressure. The value obtained is designated Ti in case of initial moisture content, Tf in case of the finalmoisture content.The value of the water vapour partial pressure obtained for the limit environment conditions defined in 3.1.3, isdesignated Tc, and is equal to 402 Pa (dew point -5 °C).SIST EN 1279-2:2004



EN 1279-2:2002 (E)13Table 2 — The water vapour partial pressure as function of the temperatureDew pointPartialwatervapourpressureDew pointPartialwatervapourpressureDew pointPartialwatervapourpressureDew pointPartialwatervapourpressure°CPa°CPa°CPa°CPa202 335-1563-2194-4111,5192 201-2518-2285-4210,3182 055-3476-2377-439,12171 935-4438-2470-448,13161 814-5402-2564-457,21151 694-6369-2657,4-466,40141 601-7343-2751,9-475,68131 494-8310-2846,8-485,04121 401-9284-2942,3-494,46111 307-10260-3038,1-503,94101 227-11238-3134,3-513,4891 147-12218-3230,9-523,0781 067-13199-3327,8-532,7071 001-14182-3425,0-542,376934-15166-3522,4-552,095876-16151-3620,1-561,844814-17138-3718,0-571,613760-18125-3816,1-581,412707-19114-3914,4-591,241656-20104-4012,9-601,080610SIST EN 1279-2:2004



EN 1279-2:2002 (E)147 Test reportThe test report shall evaluate the test in detail and shall include the following summary:Name of test house, its address and logo.Summary of report n°.Date .Insulating glass units - Moisture penetration results according to prEN 1279-2For details, see the test reportCompany:Name:.
Address:.
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