Understanding Impact Window Glass: Types, Strengths, and Energy Efficiency
Impact windows are designed to withstand extreme weather conditions while providing enhanced security and energy efficiency. At the heart of these windows lies the impact-resistant glass, which plays a crucial role in ensuring durability and performance. In this article, we’ll explore the different types of glass used in impact windows, their strengths, and how they contribute to energy efficiency.
Types of Impact Window Glass
Laminated Glass: Laminated glass is the most common type used in impact windows. It consists of two or more layers of glass bonded together with a durable interlayer, typically made of polyvinyl butyral (PVB) or ethylene-vinyl acetate (EVA). This construction gives laminated glass its strength and ability to withstand impacts without shattering.
Insulated Glass: Insulated glass, also known as double-glazed or triple-glazed glass, consists of multiple panes separated by a space filled with inert gas, such as argon or krypton. This design provides enhanced insulation, reducing heat transfer and improving energy efficiency.
Tempered Glass: While less common in impact windows, tempered glass is sometimes used in certain applications. It undergoes a special heat treatment process that increases its strength and makes it more resistant to impacts and breakage. However, tempered glass is not as effective in resisting penetration from flying debris compared to laminated glass.
Strengths of Impact Window Glass
Impact window glass is engineered to withstand high winds, flying debris, and potential impacts during hurricanes and severe storms. The laminated construction absorbs and disperses the force of impacts, preventing the glass from shattering and maintaining the structural integrity of the window. This not only protects the occupants and interior of the building but also helps prevent water intrusion and subsequent damage.
Energy Efficiency and Low-E Coatings
In addition to their impact resistance, many impact windows feature low-emissivity (Low-E) coatings to improve energy efficiency. These coatings are applied to the glass surface to reduce heat transfer and block harmful ultraviolet (UV) rays. By minimizing heat gain in the summer and heat loss in the winter, Low-E coatings help maintain a comfortable indoor temperature year-round and reduce reliance on heating and cooling systems.
Furthermore, impact windows with Low-E coatings can help protect furnishings, flooring, and artwork from fading caused by UV exposure. By filtering out UV rays, they preserve the integrity and appearance of interior spaces while enhancing energy efficiency.
In conclusion, the glass used in impact windows plays a critical role in providing strength, durability, and energy efficiency. Whether it’s laminated glass for impact resistance, insulated glass for enhanced insulation, or Low-E coatings for energy efficiency, each component contributes to the overall performance and effectiveness of impact windows in protecting homes and buildings.
