1、 Reference number ISO 20492-1:2008(E) ISO 2008INTERNATIONAL STANDARD ISO 20492-1 First edition 2008-10-01 Glass in buildings Insulating glass Part 1: Durability of edge seals by climate tests Verre dans la construction Verre isolant Partie 1: Rsistance des fermetures de ct par essais climatiques ISO
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5、ven below. COPYRIGHT PROTECTED DOCUMENT ISO 2008 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 th
6、e address below or ISOs member 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 2008 All rights reservedISO 20492-1:2008(E) ISO 2008 All ri
7、ghts reserved iiiContents Page Foreword iv Introduction.v 1 Scope1 2 Normative references1 3 Terms and definitions .1 4 Symbols and abbreviated terms 2 5 Requirements.3 6 Test methods .4 7 Methods of measurement.14 8 Test report15 Annex A (normative) Reference method for frost/dew point temperature
8、measurement.18 Annex B (normative) Moisture content measurement according to the 950 C drying method.20 Annex C (normative) Moisture content measurement by the Karl Fischer method 24 Annex D (normative) Establishing the standard moisture adsorption capacity of desiccants30 Bibliography32 ISO 20492-1
9、:2008(E) iv ISO 2008 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 technical committees. Each member bo
10、dy 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 with the International Electrot
11、echnical 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 International Standards adopted b
12、y 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 may be the subject of patent ri
13、ghts. ISO shall not be held responsible for identifying any or all such patent rights. ISO 20492-1 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 general title Glass in buildings Insul
14、ating glass: Part 1: Durability of edge seals by climate tests Part 2: Chemical fogging tests Part 3: Gas concentration and gas leakage Part 4: Test methods for the physical attributes of edge seals ISO 20492-1:2008(E) ISO 2008 All rights reserved vIntroduction This part of ISO 20492 consists of a s
15、eries 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 part of ISO 20492 is intended to help ensure that energy savings are made, as the U-value and solar
16、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 part of ISO 20492 also covers additional characteristics that a
17、re important to the trade and includes the marking of the product (i.e., the CE marking or markings of other regulatory groups). It is necessary to consider distinct markets for insulating glass. As within each market there are technical differences with respect to rebate sizes, vision lines and met
18、hods of application, two approaches are included in this part of ISO 20492. 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 minimum require
19、ments for the durability of edge seals as determined by climate tests. This part of ISO 20492 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 insula
20、ting glass units are installations in buildings and construction, such as in windows, doors, curtain walling, skylights, roofs and partitions where protection against direct ultraviolet radiation exists at the edges. NOTE In cases where there is no protection against direct ultraviolet radiation at
21、the edges, such as structural- sealant glazing systems, it is still 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. For more information on the requirements for structural-sealant g
22、lazing applications, reference can be made to ASTM C13691 , ASTM C12492and ASTM C12653 . The test methods in this part of ISO 20492 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 tes
23、ted in accordance with these method are not intended for long-term immersion in water. The options for testing apply only to sealed, insulating glass units that are constructed with glass. The methods of this part of ISO 20492 might not be applicable in certain cases, such as for insulating glass un
24、its containing spandrel glass or absorptive coatings, as these products can experience field temperatures that exceed the temperature limitations of the sealant. INTERNATIONAL STANDARD ISO 20492-1:2008(E) ISO 2008 All rights reserved 1Glass in buildings Insulating glass Part 1: Durability of edge se
25、als by climate tests 1 Scope This part of ISO 20492 establishes two methods for testing the durability of edge seals of insulating glass units by means of climate tests. The two methods are designated as Approach 1 for markets such as North America and Approach 2 for markets such as Europe. This par
26、t of ISO 20492 is applicable to pre-assembled, permanently sealed, insulating glass units with one or two airspaces, and with capillary tubes that are intentionally left open to equalize pressure inside the unit with the surrounding atmosphere. This part of ISO 20492 is not applicable to sealed, ins
27、ulating glass units that contain a spandrel glass coating. This part of ISO 20492 does not apply to insulating glass (IG) units whose function is decorative only. 2 Normative references The following reference documents are indispensable for the application of this document. For dated references, on
28、ly the cited edition applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 760, Determination of water Karl Fischer method (General method) EN 572-1, Glass in building Basic soda lime silicate glass products Definitions and general phy
29、sical and mechanical properties EN 572-2, Glass in building Basic soda lime silicate glass products Float glass EN 1279-1, Glass in building Insulating glass units Part 1: Generalities, dimensional tolerances and rules for the system description ASTM E546, Standard Test Method for Frost Dew Point of
30、 Sealed Insulating Glass Units ASTM E631, Standard Terminology of Building Constructions ASTM C1036, Standard Specification for Flat Glass 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 1279-1, ASTM E631 and the following apply. ISO 20492-1:2008(E) 2
31、 ISO 2008 All rights reserved3.1 standard laboratory conditions ambient temperature of (23 2) C and a relative humidity of (50 5) % 3.2 standard moisture-adsorption capacity capacity of a desiccant material to adsorb a quantity of moisture under controlled limit environmental conditions 3.3 controll
32、ed limit environmental conditions environment temperature of 10 C with a dew-point temperature of 5 C, giving a relative humidity of 32,8 % 3.4 moisture penetration index amount of drying capacity consumed after standardized ageing conditions 3.5 accuracy accuracy of the test method itself within st
33、atistical confidence limits of 99 % 3.6 frost/dew point temperature at which water, organic vapour or other chemicals begin to appear on the interior glass surface of a sealed, insulating glass unit 3.7 sealed, insulating glass unit pre-assembled unit consisting of panes of glass that are sealed at
34、the edges and separated by dehydrated space(s), intended for use in buildings NOTE The unit is normally used for windows, window walls, picture windows, sliding doors, patio doors, or other types of fenestration. 4 Symbols and abbreviated terms For the purposes of this document, the following symbol
35、s and abbreviations apply. I moisture penetration index (can be expressed in decimal or in percentage terms) I avaverage value of the moisture penetration index, I, based on five measurements m cmass of dish plus desiccant plus water adsorbed from 32 % r.h. air m fmass of dish plus desiccant plus wa
36、ter initially adsorbed plus water adsorbed when subjected to the climate conditions in the chamber m imass of dish plus desiccant plus water initially adsorbed M mmass of desiccant in mixtures with non-desiccant material m rmass of dish plus desiccant plus water adsorbed in equilibrium with a define
37、d reference level of relative humidity of air, or dish plus dried desiccant at high temperatures M ttotal 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 m omass of dish when empty, c
38、lean and dry ISO 20492-1:2008(E) ISO 2008 All rights reserved 3R ratio between the masses of desiccant M mand M tr.h. relative humidity T cstandard moisture adsorption capacity of desiccant T c,avaverage standard moisture adsorption capacity of desiccant, T c , obtained over two measurements T ffina
39、l moisture content of desiccant T f,uuncorrected final moisture content of desiccant T iinitial moisture content of desiccant T i,avaverage initial moisture content of desiccant, T i , obtained over four measurements T i,uuncorrected initial moisture content of desiccant temperature of test specimen
40、s in test chamber ctemperature of the central test specimen in test chamber during constant temperature phase hhigh temperature of the central test specimen in the test chamber during the high humidity/temperature cycling phase llow temperature of the central test specimen in the test chamber during
41、 the high humidity/temperature cycling phase stemperature of the central test specimen in the test chamber as the cycle moves between high temperature and low temperature and vice versa 5 Requirements 5.1 Approach 1 Final frost/dew point The six test specimens that complete the weather cycle and hig
42、h-humidity phases of the test in 6.1 shall be unbroken and without deposits in the airspaces. The final frost/dew points of all airspaces shall be 40 C or colder when measured in accordance with ASTM E546 or equivalent. 5.2 Approach 2 Moisture-penetration index The following values shall be verified
43、 on test specimens that are submitted to the climate test. The average moisture penetration index, I av , over the five test specimens shall not exceed 0,20. The average moisture penetration index, I av , shall be the average over five test specimens. Where a test specimen is broken, a spare test sp
44、ecimen shall be used instead. NOTE Breakage of the glass in a test specimen does not constitute failure of the test specimen. The specimen with the highest moisture penetration index, I, shall have an index value that does not exceed 0,25. ISO 20492-1:2008(E) 4 ISO 2008 All rights reserved6 Test met
45、hods 6.1 Approach 1 6.1.1 Principle The frost/dew point of the test specimens is measured and the test specimens are then pre-conditioned for a specified time in a high-humidity chamber with constant high temperature and high humidity. The test specimens are then placed in a weather-cycling chamber
46、where temperature, UV and moisture are varied to specified parameters for a specified number of cycles. After cycling, the test specimens are then returned to the high-humidity chamber for final conditioning. After final conditioning, the test specimens are evaluated for the final frost/dew point. 6
47、.1.2 Test specimens Each test specimen shall measure (355 6) mm wide by (505 6) mm high and shall be composed of two or three panes of clear, tinted or coated annealed, heat-strengthened, tempered or laminated glass. The double-glazed test specimens shall be fabricated with at least one pane of clea
48、r, uncoated glass. The triple-glazed test samples shall be fabricated with at least one outer pane of clear, uncoated glass. The other outer pane shall be fabricated with a glass that allows easy viewing of the frost/dew point. For double-glazed test specimens, the glass and airspace thicknesses of
49、the test specimens shall be 4 mm glass with 12 mm airspace, or 5 mm glass with 6 mm airspace. For triple-glazed test specimens, 4 mm glass with 6 mm airspaces shall be used. The tolerances of glass thickness shall be in accordance with ASTM C1036. The airspace tolerances shall be 0,8 mm. A minimum of six double-glazed test specimens shall be submitted for testing. NOTE 1 However, it is recommended to submit an additional three test specimens in case of breakage. Tr
