Insulated Ballistic Glass

When you need safety from bullets and variable weather conditions, bulletproof insulated glass protects what matters most.

A photo showcasing one example from TSS' Defender line of insulated ballistic glass

The use of Defender insulated ballistic glass in the context of a school for protection against bullets and forced-entry attacks

Protect Your Space with Bulletproof Insulated Glass

TSS' Defender line of insulated ballistic glass is made of at least two laminated glass panes separated by a sealed airspace, forming an insulated glass unit.

These insulated glass panels are easy to maintain, protective against firearms and forced entry, and great for natural light transmission. Considered a “new generation” of bulletproof glass, this material is quickly becoming a top choice for many industries, including schools, offices, municipal buildings, and more. Plus, Defender insulated ballistic glass from TSS can often be retrofitted into existing window frames, making it a perfect choice for building remodeling projects.

Our Insulated Bullet-Resistant Glass Products: DEFENDER & GCP


Product	Thickness	Level
Defender Insulated Glass	1”	Not Rated - Forced Entry Only
Defender Insulated Glass	1 ⅛”
Defender Insulated Glass	1 ¼”
Defender Insulated Glass	1 ⁹⁄₁₆”
GCP Insulated Glass	1 ⅛” - 1 ½”
GCP Insulated Glass	1 ⁹⁄₁₆” - 1 ¾
GCP Insulated Glass	1 ½” - 1 ⁹⁄₁₀”
GCP Insulated Glass	1 ¹³⁄₁₆” - 2 ¼”
GCP Insulated Glass	1 ¹³⁄₁₆” - 2 ¼”

Visit our product specifications page for data sheets, 3-part specs, and more.

DEFENDER Insulated Glass

Talk to a Ballistic
Resistance Expert

If you’d like to learn more about each product’s advantages, please reach out! One of our ballistic barrier experts is ready to learn about your project and discuss how bullet resistant glass can meet your needs.

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TSS-expertise

Is Bulletproof Glass a Good Insulator?

Bulletproof glass is thicker than standard window glass and its makeup often includes components that are good insulators, like thermoplastics. However, unless ballistic glass is designed to insulate, it won’t be the most effective temperature regulator. This is because the temperature can still transfer between the different layers of glazing, as there are no specific insulating elements.

Ballistic insulated glass is different. Unlike other types of bulletproof glass, bulletproof insulated glass has an air gap. This air gap provides a more efficient insulator, providing an element of thermal break, making windows suitable for exterior use. Total Security Solutions’ DEFENDER & GCP insulated glass units are ideal for exterior use in climates with both high and low temperatures, helping you achieve efficiency goals as well as bulletproof protection.

DEFENDER & GCP insulated ballistic glass is available in multiple thicknesses. The Defender line may be able to be retrofitted into existing frames, and both are compatible with TSS ballistic frames. Both lines can also be customized with tinting, Low-E, and other elements to enhance R-value.

How Does Insulated Ballistic Glass Compare to Other Options?

TSS’ ballistic insulated glass units are tested to UL 752 Levels 1 through 5. Bulletproof glass at these levels can withstand three rounds from various handguns up to one shot from a 7.62mm rifle. We also offer a forced-entry resistance only option.

Glass Type	UL Level	Application
Acrylic	1-2	Interior
Polycarbonate	1-3	Interior
Insulated Glass	1-5	Exterior
Glass-Clad Polycarbonate	1-5	Interior and Exterior

A collage displaying a series of insulated ballistic products that can be used in custom bulletproof windows and doors

Choosing the Right Bulletproof Insulated Glass Unit

Did you know that the most commonly-used weapon in workplace violence is a handgun? Whether you’re concerned about targeted attacks or gunfire from the street, there’s a ballistic insulated glass that’s right for you.

If you’re still in the process of learning more about your bulletproof glass options, don’t wait to check out our Ballistic Glazing Solutions Guide. This free guide outlines everything you need to know about the different types of bulletproof glass so you have what you need to make an informed decision about your bulletproofing project.

Frequently Asked Questions About Insulated Ballistic Glass

Where is insulated ballistic glass typically used?

Insulated ballistic glass is ideal for exterior applications where safety, energy efficiency, and aesthetics all matter. It’s commonly used in:

Schools
Corporate offices
Utility and payment centers
Municipal and government buildings

This type of glass is especially valuable in multi-floor structures or retrofitting projects, where it can sometimes be installed into existing frames. It allows natural light in, supports climate control, and blends seamlessly into the building’s design, all while providing tested ballistic protection.

How does insulated ballistic glass impact energy efficiency?

Insulated ballistic glass improves energy performance by reducing heat transfer through a sealed airspace between panes. Unlike traditional ballistic glass, it’s designed with a thermal break, helping lower heating and cooling costs while maintaining strong security. It’s a smart choice for buildings that need to balance safety, sustainability, and budget.

Are insulated bulletproof windows easy to maintain?

Yes. Insulated bullet-resistant windows are designed for long-term durability and easy maintenance. Unlike acrylic or polycarbonate options, they’re not prone to crazing or delamination and can be cleaned with approved glass cleaners. Their glass exterior holds up well over time, making them a reliable, low-maintenance choice for high-security environments.

Do insulated bullet-resistant windows have good light transmission?

Yes. Despite being thicker than traditional glass, insulated bullet-resistant windows offer strong light transmission—typically in the range of 60% to 75% VLT (Visible Light Transmission).

How much does insulated bulletproof glass cost?

The cost of insulated bulletproof glass can vary depending on several factors—most notably the level of ballistic protection required and the size and scope of the project. For an accurate estimate, we recommend speaking with a TSS expert who can help match the right solution to your budget and security goals.

Can security window film stop bullets like insulated ballistic windows?

No. Security window film is designed to hold shattered glass together during break-ins or blasts, but it does not stop bullets.

Only ballistic-rated glass, like insulated bullet-resistant windows, is engineered and tested to stop gunfire. If you need a complete security solution to protect from bullets, film alone won’t provide it.

To Learn More About Bulletproof Insulated Glass Options or Place an Order, Contact TSS

For decades, Total Security Solutions has protected spaces across the country with bulletproof solutions that are as beautiful as they are effective at stopping bullets. So, when you need to keep your team safe from bullets and harsh weather, TSS is ready to help. To get started, contact us or request a quote.