1、 Reference number ISO 20492-3:2010(E) ISO 2010INTERNATIONAL STANDARD ISO 20492-3 First edition 2010-08-15 Glass in buildings Insulating glass Part 3: Gas concentration and gas leakage Verre dans la construction Verre isolant Partie 3: Concentration de gaz et fuite de gaz ISO 20492-3:2010(E) PDF disc
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5、ECTED DOCUMENT ISO 2010 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs m
6、ember body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2010 All rights reservedISO 20492-3:2010(E) ISO 2010 All rights reserved iiiContents
7、 Page Foreword iv Introduction.v 1 Scope1 2 Normative references1 3 Terms and definitions .1 4 Requirements.3 4.1 Approach 1.3 4.2 Approach 2.3 5 Principle4 5.1 Approach 1.4 5.2 Approach 2.4 6 Apparatus.4 6.1 Approach 1.4 6.2 Approach 2.4 7 Reagents and materials 5 7.1 Approach 1.5 7.2 Approach 2.5
8、8 Test specimens5 8.1 Approach 1.5 8.2 Approach 2.7 9 Procedure.8 9.1 Approach 1.8 9.2 Approach 2.8 10 Precision of test method.10 10.1 Approach 1.10 10.2 Approach 2.10 11 Test report10 11.1 Approach 1.10 11.2 Approach 2.10 Annex A (normative) Calibration and standardization of the gas chromatograph
9、 for approach 112 Annex B (normative) Requirements for other gases for approach 2 14 Annex C (informative) Relationship between artificial and natural ageing with regard to thermal and sound insulation 16 Annex D (informative) Determination of the gas leakage rate by gas chromatography for approach
10、2 .17 Bibliography27 ISO 20492-3:2010(E) iv ISO 2010 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO tech
11、nical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
12、 with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft I
13、nternational Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document
14、 may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 20492-3 was prepared by Technical Committee ISO/TC 160, Glass in building, Subcommittee SC 1, Product considerations. ISO 20492 consists of the following parts, under the genera
15、l title Glass in buildings Insulating glass: Part 1: Durability of edge seals by climate tests Part 2: Chemical fogging tests Part 3: Gas concentration and gas leakage Part 4: Methods of test for the physical attributes of edge seals ISO 20492-3:2010(E) ISO 2010 All rights reserved vIntroduction Thi
16、s International Standard consists of a series of procedures for testing the performance of pre-assembled, permanently sealed insulating glass units or insulating glass units with capillary tubes that have been intentionally left open. This International Standard is intended to help ensure that energ
17、y savings are made, as the U value and solar factor (solar heat gain coefficient) 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. This International Stand
18、ard also covers additional characteristics that are important to the trade, and marking of the product (i.e. CE marking or other regulatory groups). There are distinct markets to consider for insulating glass. Within each market there are technical differences with respect to rebate sizes, vision li
19、nes and methods of application; two approaches are included in this International Standard. Approach 1 addresses requirements for markets such as North America. Approach 2 addresses requirements for markets such as Europe. Each approach includes separate test methods and specifications pertaining to
20、 minimum requirements for durability of edge seals by climate tests. This International Standard does not cover physical requirements of sealed glass insulating units such as appearance, thermo-physical properties, heat and light transmission, and glass displacement. The main intended uses of the in
21、sulating glass units are installations in buildings and constructions such as in windows, doors, curtain walling, skylights, roofs and partitions where protection against direct ultraviolet radiation exists at the edges. The use of insulating glass in cases where there is no protection against direc
22、t ultraviolet radiation at the edges, such as structural glazing systems, can be suitable. However, it can be necessary to review factors such as sealant longevity when exposed to long-term ultraviolet light and the structural properties of the sealant for these applications. NOTE 1 For more informa
23、tion on the requirements for structural sealant glazing applications, reference can be made to ASTM C1369, ASTM C1249 and ASTM C1265 and CEN technical specifications. NOTE 2 IG units whose function is artistic only are not part of this International Standard. The test methods in this International S
24、tandard are intended to provide a means for testing the performance of the sealing system and construction of sealed insulating glass units. Sealed insulating glass units tested in accordance with these methods are not intended for long-term immersion in water. The options for testing apply only to
25、sealed insulating glass units that are constructed with glass. In certain cases such as insulating glass units containing spandrel glass or absorptive coatings, these methods might not be applicable, as these products can experience field temperatures that exceed the temperature limitations of the s
26、ealant. INTERNATIONAL STANDARD ISO 20492-3:2010(E) ISO 2010 All rights reserved 1Glass in buildings Insulating glass Part 3: Gas concentration and gas leakage 1 Scope This part of ISO 20492 specifies two methods of test for insulating glass units, including a determination of the gas leakage rate an
27、d a determination of gas concentration tolerances. The two methods designated as approach 1, which is intended for use in markets such as North America, and approach 2, which is intended for use in markets such as Europe. 2 Normative references The following referenced documents are indispensable fo
28、r the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 16293-1, Glass in building Basic soda lime silicate glass products Part 1: Definitions and general p
29、hysical and mechanical properties ISO 20492-1, Glass in building Insulating glass Part 1: Durability of edge seals by climate tests ISO 20492-4, Glass in building Insulating glass Part 4: Methods of test for the physical attributes of edge seals EN 1279-6:2002, Glass in building Insulating glass uni
30、ts Part 6: Factory production control and periodic tests ASTM C1036, Standard Specification for Flat Glass 3 Terms and definitions For the purposes of this document, the terms and definitions in ISO 20492-1 and the following apply. 3.1 standard laboratory conditions ambient temperature of (23 2) C a
31、nd a relative humidity of (50 5) % 3.2 controlled limit environment conditions environment temperature of 10 C with a dew point temperature of 5 C, giving a relative humidity of 32,8 % 3.3 accuracy precision of the test method within confidence limits of 99 % ISO 20492-3:2010(E) 2 ISO 2010 All right
32、s reserved3.4 sealed insulating glass unit pre-assembled unit, comprising lites (panes) of glass that are sealed at the edges and separated by dehydrated space(s), intended for vision areas of buildings NOTE The unit is normally used for windows, window walls, picture windows, sliding doors, patio d
33、oors, or other types of fenestration. 3.5 gas-filled insulating glass units sealed insulating glass unit in which the cavity contains gas(es) in addition to air, usually for improving thermal and/or sound insulation 3.6 reference standard mixtures gas mixtures that contain known percentages of argon
34、, oxygen and nitrogen that are required for calibration purposes NOTE Where gases other than argon are used the reference samples shall contain those gases. The concentrations of each component in the reference samples should encompass the expected concentration range of the corresponding component
35、in the tested samples. The suitable standard mixtures can be obtained with a certificate of analysis of each mixture from a reputable commercial supplier. 3.7 gas concentration c ivolume of gas i in the cavity NOTE Gas concentration is expressed in units of volume percentage. 3.8 nominal gas concent
36、ration c i,onominal volume of gas i in the cavity NOTE 1 The nominal gas concentration is used as the basis for testing sound insulation and/or calculating or testing thermal insulation to fix R wand the U value, respectively. NOTE 2 Nominal gas concentration is expressed in units of volume percenta
37、ge. 3.9 final gas concentration c i,festimated final volume of gas i in the cavity NOTE 1 The final gas concentration is expressed in units of volume percentage. NOTE 2 See Annex B. 3.10 gas leakage rate L ivolume of gas i leaking from a gas-filled unit per year NOTE The gas leakage rate is expresse
38、d in units of volume percentage per year. ISO 20492-3:2010(E) ISO 2010 All rights reserved 33.11 U value for publication U pthermal transmittance value to be published, normally determined from the gas concentration c i,oNOTE See ISO 10292 and Annex B. 3.12 sound insulation measure for publication R
39、 w,p (C/C tr ) weighted sound reduction index that is published, normally determined with the gas concentration 4 Requirements 4.1 Approach 1 If the specimen is filled with argon, the average minimum fill of eight argon-filled specimens shall be 90 % when tested in accordance with 5.1. 4.2 Approach
40、2 4.2.1 Gas leakage rate The gas leakage rate, L i , expressed as a percent per year, for gases with concentrations higher than 15 %, and also for air, measured in accordance with 5.2 shall be as given in Equation (1): L i 1,00(1) For most insulating glass units, measured L ivalues are much higher t
41、han actual L ivalues would be after 10 years natural ageing. Therefore, the limiting value should not be used for calculating the gas concentration during the lifetime of the unit. See Annex C. In the case of sealants based on polysulfide, polyurethane, silicone or polyisobutylene, determining the g
42、as leakage rate of argon, Ar, may replace the measurement of the gas leakage rate for sulfurhexafluoride, SF 6 , and air. 4.2.2 Tolerances on gas concentration Tolerances on gas concentration shall be determined in accordance with EN 1279-6:2002, Annex A.3. 4.2.3 Dew-point and moisture-penetration i
43、ndices Dew-point and moisture penetration shall be determined in accordance with ISO 20492-1. 4.2.4 Edge-seal strength Edge-seal strength shall be determined in accordance with ISO 20492-4. 4.2.5 Additional requirements for gases other than argon, sulfurhexafluoride and air These requirements shall
44、be determined in accordance with Annex B. ISO 20492-3:2010(E) 4 ISO 2010 All rights reserved5 Principle 5.1 Approach 1 Argon, nitrogen and oxygen are physically separated by gas chromatography and compared to corresponding components separated under similar conditions from a reference standard mixtu
45、re or a mixture of known similar composition. 5.2 Approach 2 The gas leakage rate at 20 C is measured after subjecting the test specimen to a climate as specified in ISO 20492-1 with the following modifications. The number of cycles is reduced to 28. The time at a constant temperature of 58 C is red
46、uced to 4 weeks. For measuring the gas leakage rate, the unit is placed in a gastight container and, after a given time, the amount of gas that has leaked from the unit is measured. After this measurement, the gas concentration in the unit is analysed and the gas leakage rate calculated. 6 Apparatus
47、 6.1 Approach 1 6.1.1 Gas chromatograph The gas chromatograph is comprised of a gas sampling valve with a capacity of 100 L to 250 L, an adsorption column that is capable of separating argon from other gases, a detector and an integrator. Chromatograms shall be reproducible so that successive runs o
48、f a reference standard agree on each component peak area within 0,1 %. NOTE An example of a detector is a thermal conductivity detector (TCD). 6.2 Approach 2 6.2.1 Climate exposure The climate exposure should be as specified in ISO 20492-1. 6.2.2 Container for gas leakage rate measurement A controll
49、ed temperature container shall be used for measuring the gas leakage rate. It shall be hermetically sealable, and capable of surrounding the test specimen while inducing as little stress as possible on the specimen. The residual volume in the container shall be as small as possible yet still allow the exposure of the sealed edge zones of the specimen to the circulation of purging gas. The quantity of ambient air penetrating into the container from outside or the quantity of each constituent leak
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