The Basics

Impact windows are designed with laminated glass, a combination of two or more pieces of glass bonded with a layer of plastic. This construction adds strength and flexibility to the window and makes it difficult for external pressure to break through. 

The most common ratings for impact-resistant windows are ASTM E 1886 and ASTM E 1996 – these tests measure how well a window can withstand hurricane-force winds, heavy rains, and wind-driven objects. The higher the rating, the more protection your windows will have.

What are the Impact Windows Ratings?

Impact windows ratings are determined by the level of protection they offer against wind-driven debris and hurricane-force winds. The most common rating system is from ASTM, which uses a scale ranging from 0 to 6 – each number indicates a different level of protection, with six being the highest. 

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  Scale 0: This rating indicates no impact resistance.
• Scale 1: This rating indicates minimal protection from light impacts.
• Scale 2: This rating protects from heavier objects such as branches and twigs.
• Scale 3: This rating provides protection against large objects such as rocks, small to medium-sized tree limbs, and other moderately large pieces of debris.
• Scale 4: This rating protects larger objects, such as golf balls and large tree limbs.
• Scale 5: This rating protects large objects such as softballs and 2x4s.
• Scale 6: This is the highest level of impact resistance, protecting objects such as baseballs.

Are Impact Windows Burglar-Proof?

Impact windows are not unbreakable; however, they are difficult to breach. A thief would require a great deal of noise and effort to get through these robust barriers - making apprehending them more likely  before they enter the premises. As such, burglars tend to avoid targeting properties fitted with impact windows due to the required labor.

Are Impact Windows Bulletproof?

Impact windows are designed to resist strong winds, rain, and wind-driven debris – but they are not bulletproof. Impact windows may be able to slow down or stop bullets from penetrating the glass, depending on their rating and the type of weapon used. However, it is not guaranteed that they will be able to stop a bullet completely.

The ASTM E 1886 and ASTM E 1996 ratings only measure the protection against wind and debris impacts, not bullets. To protect against bullets, you'll need to install bullet-resistant glass.

How Does Bulletproof Glass Work?

This is a special type of glass designed to absorb and disperse the force of a bullet, preventing it from penetrating completely. It uses multiple layers of glass, each with its specific role in protecting against bullets.

The outer layer absorbs the energy and impact of the bullet, slowing it down, while the inner layers are made from tougher materials, such as polycarbonate or laminated glass, which deflect the bullet completely. This type of glass is rated on a scale from 1 to 10, with 10 offering the highest level of protection.

#1 in Impact Window and Door Services

Impact windows can protect against wind-driven debris and hurricane-force winds – but they are not bulletproof. Bulletproof glass is the way to go if you're looking for the ultimate protection.

At Unlimited Windows and Door, we install impact glass windows and doors for residential and commercial projects. Our team is highly experienced in providing the highest level of protection against outside elements, so you can rest assured that your property is secure. Contact us today to learn more about how we can help protect your property!