--- title: Key Elements of an IGU | Vitro Architectural Glass description: Learn how seals, spacers and desiccants work together to influence the performance and durability of insulating glass units. image: https://glassed.vitroglazings.com/hubfs/IGU%20Key%20elements_1150x600.jpg --- [![Vitro Architectural Glass](https://www.vitroglazings.com/assets/images/vitro_logo_color.svg)](https://www.vitroglazings.com/) - [Products](https://www.vitroglazings.com/products/) - - [Low-e Glass](https://www.vitroglazings.com/products/low-e-glass/) - [*Solarban*® 60 Glass](https://www.vitroglazings.com/products/low-e-glass/solarban-60-glass/) - [*Solarban*® 60 *Optiblue*® Glass](https://www.vitroglazings.com/products/low-e-glass/solarban-60-optiblue-glass/) - [*Solarban*® 65 Glass](https://www.vitroglazings.com/products/low-e-glass/solarban-65-glass/) - [*Solarban*® 70 Glass](https://www.vitroglazings.com/products/low-e-glass/solarban-70-glass/) - [*Solarban*® 70 *Optiblue*® Glass](https://www.vitroglazings.com/products/low-e-glass/solarban-70-optiblue-glass/) - 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[Education](https://www.vitroglazings.com/education/) - [Glass Education Center](https://glassed.vitroglazings.com/) [![](https://glassed.vitroglazings.com/hubfs/Glass%20Education%20Center/blog%20feature%20images/transparent_spacer_1150x600.png)](https://glassed.vitroglazings.com/key-elements-of-an-igu) ###### [ARTICLE](https://glassed.vitroglazings.com/key-elements-of-an-igu) # Key Elements of an IGU 2 minute read ## What You'll Learn: - The Primary Components That Make Up an Insulating Glass Unit (IGU) - How Each Component Contributes to Thermal Performance and Durability - Why Spacers, Sealants and Gas Fills Are Important as the Glass Itself - How IGU Design Impacts Energy Efficiency, Occupant Comfort and Long-Term Performance ### Sections - [The Spacer System](https://glassed.vitroglazings.com/key-elements-of-an-igu#spacer) - [The Gas Fill](https://glassed.vitroglazings.com/key-elements-of-an-igu#gas) - [The Sealants](https://glassed.vitroglazings.com/key-elements-of-an-igu#sealants) - [Why Every Component Matters](https://glassed.vitroglazings.com/key-elements-of-an-igu#why) Insulating glass units (IGUs) are at the heart of today's high-performance glazing systems, helping control heat transfer, improve occupant comfort and support energy-efficient building design. ![Infographic showing the key elements and proportional dimensions of an insulating glass unit (IGU)](https://glassed.vitroglazings.com/hubfs/Glass%20Education%20Center/Elements_of_IGU.jpg) Many people focus primarily on the glass itself when evaluating performance. However, an IGU is much more than two panes of glass separated by air. The performance of an IGU depends on several interconnected components working together as a system. ![Illustration of the outside of an IGU](https://glassed.vitroglazings.com/hs-fs/hubfs/undefined.jpeg?width=140&height=157&name=undefined.jpeg) ### **The Glass.** The most visible component of an IGU is the glass itself. Depending on the application, the glass may be clear, tinted, laminated, low-iron or coated with solar control, low-emissivity (low-e) coatings. Modern low-e glasses play a critical role in reducing heat transfer, improving energy efficiency and managing solar heat gain. When paired with other IGU components, these coatings help create glazing systems capable of delivering exceptional thermal performance while preserving daylight and views. ![Illustration showing the spacer system in an insulating glass unit (IGU)](https://glassed.vitroglazings.com/hs-fs/hubfs/undefined-1.jpeg?width=252&height=172&name=undefined-1.jpeg) ### **The Spacer System** Located around the perimeter of the IGU, the spacer serves several important functions. It separates the glass lites, maintains the cavity between them and helps support the unit's overall structural integrity. Spacers also influence thermal performance. Older aluminum spacer systems conducted heat more readily, creating thermal bridges at the edge of the glass. Today's warm-edge spacer technologies are designed to reduce heat transfer around the perimeter of the IGU, helping improve overall energy performance and interior comfort. ![Illustration showing the performance enhancing gas fill in an insulating glass unit (IGU)](https://glassed.vitroglazings.com/hs-fs/hubfs/undefined-4.jpeg?width=136&height=192&name=undefined-4.jpeg) ### **The Gas Fill** The space between the glass lites is often filled with a performance-enhancing gas rather than ordinary air. Argon is the most used gas because it is denser than air and slows heat transfer through the cavity. In some applications, other gases may be used to further improve insulating performance. This gas-filled cavity works in conjunction with low-e coatings and spacer technology to enhance thermal efficiency and support lower heating and cooling loads. ![Illustration showing the sealants in an insulating glass unit (IGU) to keep moisture out and insulating gas in](https://glassed.vitroglazings.com/hs-fs/hubfs/undefined-2.jpeg?width=166&height=157&name=undefined-2.jpeg) ### **The Sealants** Sealants are among the most underrated components of an IGU. Primary and secondary sealants help keep moisture out and insulating gas in. Without an effective seal, an IGU can lose gas over time, reducing performance and potentially leading to condensation issues. The longevity and durability of an IGU are closely tied to the performance of its sealant system, making proper seal selection and fabrication critical to long-term success. ## **Why Every Component Matters** An IGU performs best when all its components work together. High-performance glass alone cannot maximize energy efficiency if the spacer system, gas fill or sealants are not designed to support the overall system. When properly engineered, an IGU can: - Reduce heat transfer - Lower heating and cooling costs - Improve occupant comfort - Minimize condensation potential - Enhance daylighting while controlling solar heat gain - Support sustainability and energy-efficiency goals Modern IGUs demonstrate that building performance is about how multiple technologies work together. By understanding the key elements of an IGU, project teams can make more informed glazing decisions and specify systems that deliver lasting value throughout the life of a building. **Topics:** [Insulating Glass Units](https://glassed.vitroglazings.com/tag/insulating-glass-units), [Understanding Performance](https://glassed.vitroglazings.com/tag/understanding-performance), [Science of Glass](https://glassed.vitroglazings.com/tag/science-of-glass) Updated on September 25, 2026 This is a search field with an auto-suggest feature attached. - There are no suggestions because the search field is empty. ### Topics - [Making Glass](https://glassed.vitroglazings.com/tag/making-glass) - [Specifying Glass](https://glassed.vitroglazings.com/tag/specifying-glass) - [Science of Glass](https://glassed.vitroglazings.com/tag/science-of-glass) - [All Topics](https://glassed.vitroglazings.com/) - [Bird-Friendly Glass](https://glassed.vitroglazings.com/tag/bird-friendly-glass) - [Environment & Ecology](https://glassed.vitroglazings.com/tag/environment-ecology) - [Glass Color & Aesthetics](https://glassed.vitroglazings.com/tag/glass-color-aesthetics) - [Glass Fabrication](https://glassed.vitroglazings.com/tag/glass-fabrication) - [Glass Installation](https://glassed.vitroglazings.com/tag/glass-installation) - [Insulating Glass Units](https://glassed.vitroglazings.com/tag/insulating-glass-units) - [Low-E Glass](https://glassed.vitroglazings.com/tag/low-e-glass) - [Low-Iron Glass](https://glassed.vitroglazings.com/tag/low-iron-glass) - [Understanding Performance](https://glassed.vitroglazings.com/tag/understanding-performance) - [Glossary](https://glassed.vitroglazings.com/glossary) - [FAQs](https://glassed.vitroglazings.com/faqs) ### Subscribe to our newsletter ### Word of the Month #### ASHRAE American Society of Heating, Air-conditioning and Refrigerating Engineers. 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