1、 Reference number ISO 20492-2:2008(E) ISO 2008INTERNATIONAL STANDARD ISO 20492-2 First edition 2008-10-01 Glass in buildings Insulating glass Part 2: Chemical fogging tests Verre dans la construction Verre isolant Partie 2: Essais dembuage chimique ISO 20492-2:2008(E) PDF disclaimer This PDF file ma
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5、 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 member body in the count
6、ry 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 20492-2:2008(E) ISO 2008 All rights reserved iiiContents Page Foreword iv Intro
7、duction.v 1 Scope1 2 Normative references1 3 Terms and definitions .1 4 Requirements.2 5 Test methods .2 6 Test report8 Bibliography13 ISO 20492-2:2008(E) iv ISO 2008 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards
8、bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical 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 organizat
9、ions, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in th
10、e ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International 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
11、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 rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 20492-2 was prepared by Technical Committee ISO/TC 160, Glass i
12、n building, Subcommittee SC 1, Product considerations. ISO 20492 consists of the following parts, under the general 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: Test metho
13、ds for the physical attributes of edge seals ISO 20492-2:2008(E) ISO 2008 All rights reserved vIntroduction This part of ISO 20492 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
14、 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 factor (solar heat gain coefficient) do not change significantly; health is preserved, because sound-reduction and vision do not change significantly; saf
15、ety is provided because mechanical resistance does not change significantly. This part of ISO 20492 also covers additional characteristics that are important to the trade, and marking of the product (i.e. CE marking or other regulatory groups) is also included. There are distinct markets to be consi
16、dered for insulating glass. As within each market there are technical differences with respect to rebate sizes, vision lines and methods 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 re
17、quirements for markets such as Europe. Each approach includes separate test methods and specifications pertaining to minimum requirements for the durability of edge seals by climate tests. This part of ISO 20492 does not cover the physical requirements of sealed glass insulating units such as appear
18、ance, thermo-physical properties, heat and light transmission and glass displacement. The main intended uses of the insulating glass units are installations in buildings and constructions such as in windows, doors, curtain walling, skylights, roofs and partitions where protection against direct ultr
19、aviolet radiation exists at the edges. NOTE In cases where there is no protection against direct ultraviolet radiation at 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 stru
20、ctural properties of the sealant for these applications. For more information on the requirements for structural sealant glazing 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 th
21、e 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 sealed, insulating glass units that are constructed w
22、ith glass. The methods of this part of ISO 20492 might not be applicable in certain cases, such as insulating glass units containing spandrel glass or absorptive coatings, as these products can experience field temperatures that exceed the temperature limitations of the sealant. INTERNATIONAL STANDA
23、RD ISO 20492-2:2008(E) ISO 2008 All rights reserved 1Glass in buildings Insulating glass Part 2: Chemical fogging tests 1 Scope This part of ISO 20492 establishes two methods for testing the resistance to fogging of pre-assembled, permanently sealed insulating glass units or insulating glass units w
24、ith capillary tubes intentionally left open. The two methods are designated as Approach 1 for markets such as North America, and Approach 2 for markets such as Europe. This part of ISO 20492 is not applicable to sealed, insulating glass units containing a spandrel glass coating due to testing limita
25、tions. 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, only the cited edition applies. For undated references
26、, the latest edition of the referenced document (including any amendments) applies. ISO 20492-1, Glass in buildings Insulating glass Part 1: Durability of edge seals by climate tests EN 572-1, Glass in building Basic soda lime silicate glass products Definitions and general physical and mechanical p
27、roperties 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 C1036, Standard Specification for Flat Glass 3 Terms and definitions Fo
28、r the purposes of this document, the terms and definitions given in ISO 20492-1 and the following apply. 3.1 fog visible deposits present after testing on the inside surface(s) of an insulating glass unit 3.2 sealed, insulating glass unit pre-assembled unit, comprised of panes of glass that are seal
29、ed 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 doors, or other types of fenestration. ISO 20492-2:2008(E) 2 ISO 2008 All rights reserved4 Requirements 4.1 App
30、roach 1 No fog shall be visible after the test has ended in accordance with 5.1.4. 4.2 Approach 2 No permanent visual condensation shall be permitted in accordance with 5.2.4. 5 Test methods 5.1 Approach 1 5.1.1 Principle Test specimens are placed in a chamber that is controlled at (50 3) C. A lamp
31、is positioned in the bottom of the chamber to supply heat and UV radiation. A chilled plate, controlled to a constant temperature of (21 2) C, is positioned on the centre of each specimen. After 7 days of exposure, the test specimens are examined at arms length for fog. 5.1.2 Test specimens Each tes
32、t specimen shall measure (355 6) mm by (505 6) mm, 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 specimen shall be fabricated with at least one pane of clear, uncoated glass. The triple-glazed t
33、est specimen 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 fog. For double-glazed test specimens, the glass and airspace thicknesses shall be 4 mm glass with 12 mm airspace or 5 mm glass wi
34、th 6 mm airspace. For triple-glazed test specimens, 4 mm glass with 6 mm airspaces shall be used. Tolerance of glass thickness shall be in accordance with ASTM C1036. Airspace tolerance(s) shall be 0,8 mm. A minimum of two specimens of double-glazed or four specimens of triple-glazed test specimens
35、shall be submitted for testing. NOTE 1 However, it is recommended to submit extra specimens in case of breakage. Triple-glazed test specimens where the intermediate airspace divider is a plastic film shall be acceptable for testing. NOTE 2 The overall unit thickness of a test specimen has some limit
36、s. Testing laboratories are usually able to accommodate 30 mm overall thickness. If testing thicker units, it is necessary to contact the testing laboratory prior to manufacturing to ascertain their capabilities for testing thicker units. Each specimen shall be permanently and legibly marked with th
37、e designation of the manufacturer, the date of fabrication (month or quarter and year) and orientation intended in the field (for test specimens that have been constructed with coated glass). ISO 20492-2:2008(E) ISO 2008 All rights reserved 3During all stages of exposure and storage, the test specim
38、ens shall be held in a vertical position with equal support to all panes and no compression loading. The selection of test specimens for testing shall be made at random, except when specimens have been damaged in transit. Damaged test specimens shall not be tested. Test specimens representing sealed
39、, insulating glass units that are gas-filled shall be fabricated using the same hole-sealing and gas-filling techniques as those used during manufacturing. For example, if a gas-filling plug is used in manufacturing, then it should be used in the test specimens. It is not necessary that the specimen
40、s be filled with gas provided that the gas is classified as inert. Test specimens representing products that are normally filled with an inert gas in production may be submitted air filled for this testing as long as they have been manufactured with the same techniques as used in production. Test sp
41、ecimens representing sealed, insulating glass units that include tubes intended to be left open shall be fabricated with one tube. This tube shall be left open during testing. Test specimens representing sealed, insulating glass units that include tubes intended to be closed off after shipping shall
42、 be fabricated with one tube. The exterior end of this tube shall be closed prior to testing. For test specimens representing sealed, insulating glass units that include internal components in the air space, the grid formed by these components shall divide the test specimen into nine equal areas (3
43、3) (see Figure 1). Key 1 insulating glass spacer/edge seal 2 internal grids Figure 1 Test specimen with internal grids The test specimens should be sealed a minimum of 4 weeks from the date of manufacture to allow for stabilization before testing. Before testing, the glass surfaces shall be checked
44、to ensure that they are clean. ISO 20492-2:2008(E) 4 ISO 2008 All rights reserved5.1.3 Apparatus 5.1.3.1 Volatile fog test apparatus The dimensions and components of the volatile fog test apparatus shall be in accordance with Figure 2. The construction of the apparatus shall be capable of maintainin
45、g (50 3) C. In order to maintain this temperature, a fan shall be mounted in the box. The fan shall run continuously. The apparatus shall be constructed from sturdy, solid materials that minimize the escape of ultraviolet light into the surrounding area. Plywood that is at least 12 mm thick has been
46、 found to be suitable for this purpose. If plywood is used to construct the apparatus, the entire interior of the apparatus should be lined with aluminium foil or other reflective material. NOTE Stainless steel construction is also acceptable. The interior of the apparatus shall have a reflective su
47、rface. The test specimen supports shall be located in accordance with Figure 2. The cooling plates shall be constructed of a conductive material such as copper or brass. The cooling plates shall be nominally 150 mm 5 mm in diameter, and shall be placed directly in complete contact with the glass sur
48、face for the duration of the test. Alternatively, a rectangular cooling plate shall have an area of 0,017 7 0,000 6 m 2 . The cooling water temperature shall be determined as the water immediately exits the apparatus from each cooling plate as shown in Figure 2. The cooling water temperature at thes
49、e locations shall be 21 C 2 C. The apparatus shall have radiation-shielded thermocouples to continuously monitor the temperature of the apparatus, located in accordance with Figure 2. 5.1.3.2 Ultraviolet light source WARNING Light from the ultraviolet sources used in this test method are harmful to the human body, especially to the eyes. Appropriate protective measures should be observed. The source shall consist of one ultraviolet lamp. The output of the UV source shall be
