ISO 20492-2:2008 PDF

Name: ISO 20492-2:2008 — Glass in buildings - Insulating glass — Part 2: Chemical fogging tests
SKU: ISO 20492-2:2008
Price: 25 EUR
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Glass in buildings - Insulating glass — Part 2: Chemical fogging tests

Название (английский):

ISO 20492-2:2008

Glass in buildings - Insulating glass — Part 2: Chemical fogging tests

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 13
Дата публикации:: 29 сентября 2008 г.
Издание:: ISO IS 20492 edition 1 version 1
ICS:: 81.040.20

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Описание (английский):

ISO 20492:2008 establishes two methods for testing the resistance to fogging of pre-assembled, permanently sealed insulating glass units or insulating glass units with 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. ISO 20492:2008 is not applicable to sealed, insulating glass units containing a spandrel glass coating due to testing limitations. ISO 20492:2008 does not apply to insulating glass (IG) units whose function is decorative only.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview - ISO 20492-2:2008 (Chemical fogging tests)

ISO 20492-2:2008 is the International Standard that specifies chemical fogging tests for insulating glass (IG) units used in buildings. It defines two test approaches - Approach 1 (markets such as North America) and Approach 2 (markets such as Europe) - to assess the resistance of pre‑assembled, permanently sealed IG units (or units with intentionally left open capillary tubes) to internal fogging or permanent visual condensation. The standard excludes IG units with spandrel glass coatings and decorative‑only units.

Key topics and technical requirements

Scope and purpose: Test the sealing system and construction of sealed insulating glass units to help preserve energy performance (U‑value, solar factor), vision, acoustic properties and mechanical safety.

Two approaches: Approach 1 and Approach 2 use different test methods and pass/fail criteria aligned with regional market practices.

Acceptance criteria:

Approach 1 - No visible fog after testing.
Approach 2 - No permanent visual condensation permitted.

Test conditions (Approach 1 example):

Chamber temperature: (50 ± 3) °C with continuous air circulation.
Chilled cooling plate in contact with glass: (21 ± 2) °C.
UV source intensity: ≥ 400 µW/cm² measured at ~355 mm.
Exposure duration: 7 days.

Specimen geometry and quantity: Standard specimen size 355 × 505 mm; minimum 2 specimens for double glazing or 4 specimens for triple glazing. Glass and airspace thickness tolerances and material types are defined (clear, tinted, coated, annealed/tempered/laminated).

Apparatus details: Test box with reflective interior (e.g., plywood lined with foil or stainless steel), fan for temperature control, radiation‑shielded thermocouples, conductive cooling plates (nominal 150 mm diameter or equivalent area).

Special cases: Procedures for units with low‑e coatings, gas‑filled units, units with capillary tubes (open/closed), and internal grids are specified.

Applications and who uses it

Insulating glass manufacturers for product development and quality control.

Independent test laboratories performing fogging resistance tests.

Architects, façade engineers and specifiers to verify long‑term visual and thermal performance.

Curtain wall and window fabricators ensuring edge‑seal durability and compliance.

Regulatory bodies and certification agencies for product marking and conformity (e.g., CE marking considerations).

Practical benefits include maintaining energy efficiency, visual clarity and occupant health/safety by preventing internal fogging in fenestration, skylights, curtain walls and other glazing applications.

Related standards

ISO 20492‑1: Durability of edge seals by climate tests

ISO 20492 Parts 3 & 4: Gas concentration/gas leakage; physical attributes of edge seals

EN 1279 series, EN 572 series, ASTM C1036 (referenced for glass types and tolerances)

Keywords: ISO 20492-2:2008, chemical fogging tests, insulating glass, IG units, fogging resistance, volatile fog test apparatus, low‑e coatings, edge seals, sealed insulating glass units.

ISO 20492-2:2008 PDF

Abstract

Похожие стандарты

Overview - ISO 20492-2:2008 (Chemical fogging tests)

Key topics and technical requirements

Applications and who uses it

Related standards

Технические детали

ISO 20492-1:2008

Glass in buildings - Insulating glass — Part 1: Durability of edge seals by climate tests

ISO 20492-3:2010

Glass in buildings — Insulating glass — Part 3: Gas concentration and gas leakage

BS EN 1279-3:2018

Glass in building. Insulating glass units. Long term test method and requirements for gas leakage rate and fo…