What Makes Impact Windows So Strong? The Testing Process Explained

What Makes Impact Windows So Strong? The Testing Process Explained

Impact windows are known for their ability to withstand strong winds, debris, and impacts from objects. However, have you ever wondered what makes them so strong? In this blog post, we will discuss the testing process behind impact windows and what makes them so durable.

How its work

Impact windows undergo a rigorous testing process to ensure they meet the standards set by various organizations, such as the American Society for Testing and Materials (ASTM) and the Miami-Dade County Product Control Division. These tests assess the strength, durability, and impact resistance of the windows.


One of the tests performed on impact windows is the Large Missile Impact Test, where a 9-pound 2×4 wooden board is fired at the window at 34 miles per hour. The window must remain intact and in the frame for the impact to be considered successful. Another test is the Small Missile Impact Test, where a steel ball is shot at the window at 50 feet per second. The window must not break, and the glass must remain intact in the frame.


Additionally, impact windows are tested for their ability to withstand high winds. The pressure cycling test is performed by subjecting the window to pressure changes from -50 to +50 pounds per square foot. This simulates wind speeds of up to 200 miles per hour.


The durability of impact windows is also tested through the cyclic pressure test. This test subjects the window to 4,500 cycles of pressure changes, equivalent to 10 years of exposure to wind, rain, and other elements. The window must remain intact and functional after the test.



The testing process for impact windows is rigorous and thorough, ensuring that they can withstand the most extreme weather conditions. The Large Missile Impact Test, Small Missile Impact Test, pressure cycling test, and cyclic pressure test are just some of the tests performed to ensure the durability and strength of impact windows. By understanding the testing process, homeowners can have peace of mind knowing their homes are protected from the elements. 

If you’re interested in installing impact windows in your home, contact us today to schedule a consultation and learn more about our impact window options.

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