Ballistic Glass | UL 752 Level 1–10

Quick Summary

Ballistic glass — accurately, bullet-resistant glazing — is transparent armor engineered to stop firearm projectiles, used in bulletproof windows and transaction barriers. It is rated under UL 752 across Levels 1–10, from handgun threats (Levels 1–3) to rifle and specialized threats (Levels 4–10). Common materials are laminated polycarbonate, glass-clad polycarbonate, acrylic, and laminated glass, ranging ¾″ to 4″ thick. Ballistic glass is commonly specified in courthouses, schools, banks, government buildings, and police stations. Bullet resistance is a system property: glazing must be installed in a rated frame. Armortex is a single-source manufacturer of ballistic glass and bulletproof windows across UL 752 11th edition Levels 1–10, supplying laminated polycarbonate, glass-clad polycarbonate, acrylic, and laminated glass in coordinated rated frames.

What Is Ballistic Glass?

Ballistic glass — also called bullet-resistant glazing, bulletproof glass, or transparent armor — is a multi-layer transparent material engineered to absorb and stop projectile penetration. Alternative search phrases include bulletproof windows, ballistic glazing, transparent ballistic panels, security glazing, and armored glass. It is commonly specified in courthouses, police stations, schools, banks, government buildings, and transactional service windows, and architectural applications include reception counters, teller lines, control rooms, and building perimeter glazing.

Bulletproof windows pay close attention to design style, using ballistic-resistant glass with high optical clarity and high-performance ballistic-grade materials in a range of configurations. The governing standard is UL 752, and glazing is selected by protection level based on a facility threat assessment. Armortex manufactures ballistic glass in all four common make-ups — laminated polycarbonate, glass-clad polycarbonate, acrylic, and laminated glass — for interior and exterior openings.

Common Misconceptions

“Bulletproof” is common usage; the accurate term is bullet-resistant — glazing is rated for specific calibers, not unlimited protection.
Glass alone is not protection. Bullet resistance is a system property: the frame must be rated and coordinated with the glazing.
Ballistic film is not ballistic glass. Film (3–8 mils) cannot stop bullets; real glazing is ¾″ to 4″ thick.

UL 752 Levels 1–10 Explained

UL 752 (Underwriters Laboratories) rates bullet-resistant glazing by firearm type, caliber, and number of shots across 10 levels:

UL 752 Levels	Threat Category	Example Firearms / Calibers	Glazing Range
Levels 1–3	Handgun	9mm, .357 Magnum, .44 Magnum	Available
Levels 4–8	Rifle	.30-06 and higher	Available
Levels 9–10	Specialized / automatic rifle	High-powered, fully automatic	Available

The required level comes from a facility threat assessment. Armortex glazing is tested to UL 752 11th edition across all ten levels. NIJ standards, by contrast, apply mainly to military and federal law enforcement field use; UL 752 is the standard for commercial architectural glazing.

Why Ballistic Glass Is Growing in Demand

Specification of ballistic glass has expanded alongside heightened attention to physical security in public and institutional buildings:

Safety concerns in schools, where security vestibules and protected reception areas are increasingly specified.
Threat exposure in government buildings, courthouses, and police stations that justifies certified glazing.
Demand in healthcare facilities such as emergency departments and pharmacy counters, where staff face elevated risk.
Preference for lighter polycarbonate-based glazing that protects without the weight of all-glass assemblies.
Operational need for transaction openings — teller and service windows — that protect staff while allowing communication and exchange.

Armortex has manufactured bullet-resistant glazing and bulletproof windows for these applications for over 40 years, serving schools, government, judicial, law enforcement, healthcare, and financial facilities.

Common Types of Ballistic Glass

Laminated Polycarbonate

Multiple bonded polycarbonate layers forming lightweight transparent glazing that excels at catching and containing projectiles.

Advantages: Lightest option, easy to fabricate, no-spall designations available.
Limitations: Surface scratches more readily; best for interior use.
Best applications: Bank teller windows, pharmacy counters, school vestibules, government service windows, corrections barriers.
Common building types: Schools, financial, healthcare, government.
Typical Armortex products: TP 100 (Level 1), TP 200 (Level 2), TP 300 (Level 3), all no-spall.
Cost implications: Lower weight reduces shipping and installation labor; cost rises with level.

Acrylic

A monolithic thermoplastic option that is light and easy to fabricate, suited to lower-level interior applications. The Armortex TA 100 is rated UL 752 Level 1, no-spall, 1.25″ thick, 7.6 lbs/ft².

Advantages: Easy to fabricate, good optical clarity, lighter interior option.
Limitations: Lower-level protection; interior use.
Best applications: Interior service windows and counters with handgun-level requirements.

Glass-Clad Polycarbonate (GCP)

Bonds a glass exterior to a polycarbonate core: the glass resists scratching and weather, the polycarbonate contains projectiles and resists physical attack. Armortex supplies glass-clad polycarbonate for high-security exterior openings and combined forced-entry/ballistic assemblies.

Advantages: Exterior-capable, durable surface, long service life, projectile containment; suited to combined forced-entry/ballistic openings.
Limitations: Heavier and higher cost than laminated polycarbonate.
Best applications: High-security exterior openings, government buildings, military installations, embassies.

Laminated Glass

Multiple bonded glass layers with interlayer films, delivering excellent optical clarity, scratch resistance, UV stability, and weather durability for interior and exterior use. Armortex laminated glass make-ups are suited to exterior facades and perimeter glazing.

Advantages: Best surface durability and long-term clarity; suitable for exterior facades.
Limitations: Heaviest option; higher cost; more brittle under sustained physical attack than polycarbonate.
Best applications: Exterior storefront windows, perimeter glazing, government facades, courthouses.

Comparison Table: Ballistic Glass Materials

Each glazing material leads in its niche. Lightweight laminated polycarbonate is the standard for interior transaction openings; glass-based assemblies lead for exterior durability. Armortex manufactures all four glazing types, so the right material can be matched to each opening from a single source.

Glazing Material	Placement	Weight	Best Use	Key Trait
Laminated polycarbonate	Interior	Lightest	Transaction windows, vestibules	Lightest option, no-spall, easy to fabricate
Acrylic	Interior	Light	Service windows (Level 1)	Easy to fabricate, good clarity
Glass-clad polycarbonate	Exterior / high-security	Heavier	Government, military, embassies	Scratch/weather resistance + containment
All-glass laminate	Interior / exterior	Heaviest	Storefronts, facades, courthouses	Best surface durability and clarity

Protection levels, thickness, and weight vary by configuration; confirm current data with the manufacturer.

Codes, Standards & Certifications

UL 752 (Underwriters Laboratories) — the governing ballistic standard, Levels 1–10.
ASTM International — material and fire test standards.
ICC / International Building Code (IBC) — building-level requirements coordinated with the assembly.
OSHA — applicable workplace safety requirements.
GANA — glazing installation guidelines.
ISO 9001 — quality-management certification under which Armortex manufactures.
U.S. Department of State FE/BR — for combined forced-entry/ballistic windows and doors.

Retrofit vs New Construction Applications

Retrofit suitability: Lighter polycarbonate glazing is advantageous where existing structural support is limited.
Framing for existing openings: Armortex offers clamp-on aluminum frame systems designed to work with existing opening conditions.
Exterior retrofit: Glass-clad polycarbonate or all-glass laminates may be required where weather resistance is essential; confirm structural capacity for the added weight.
Coordination: As a system property, glazing and frame must be coordinated; the assembly carries the rating, not the glass alone.
Installation: Armortex supplies materials and does not install directly but can assist in finding qualified contractors.

Cost Considerations

Material cost increases with protection level, thickness, and glass content; all-glass and glass-clad polycarbonate are generally more expensive than laminated polycarbonate at equivalent levels.
Lighter polycarbonate products reduce shipping and installation labor.
Lifecycle value: glass-based assemblies require less surface maintenance; polycarbonate costs relate primarily to surface care and coatings over time.
Frame cost: aluminum, hollow metal, or stainless steel framing is an additional, coordinated line item.

Lifecycle value should account for material cost, frame cost, installation, freight, and projected service life. As a single-source supplier of glazing and rated frames, Armortex allows these to be coordinated within one assembly.

Key Questions Architects Should Ask Before Specifying

What UL 752 level does the threat assessment require (Levels 1–10)?
Is the opening interior or exterior, and is the glazing material appropriate for that exposure?
Is a bullet-resistant rated frame specified and coordinated with the glazing?
What spall designation is required — is no-spall needed for occupant proximity?
Does the opening require combined forced-entry/ballistic (FE/BR) protection?
Have nominal thickness and weight been checked against structural limits?
Is the product UL Listed, with submittal documentation available?
Are communication and transaction accessories available from the same manufacturer?
Are BIM objects and CSI MasterFormat specification data available?
What are the manufacturer’s lead times and warranty for both glazing and frame?

Frequently Asked Questions

What is ballistic glass?

Ballistic glass, or bullet-resistant glazing, is multi-layer transparent armor engineered to stop firearm projectiles. Common materials are laminated polycarbonate, glass-clad polycarbonate, acrylic, and laminated glass, rated under UL 752 across Levels 1–10 and used in bulletproof windows and transaction barriers.

What UL 752 levels are available for ballistic glass?

Glazing is available across UL 752 Levels 1 through 10: Levels 1–3 for handgun threats, Levels 4–8 for rifle threats, and Levels 9–10 for specialized high-powered and fully automatic rifle threats. Armortex glazing is tested to UL 752 11th edition, Levels 1–10.

Is bulletproof glass actually bulletproof?

No glazing is truly bulletproof. The accurate term is bullet-resistant: products are certified under UL 752 to stop specific firearms and calibers at a defined level, rather than offering unlimited protection against all projectiles or unlimited shots.

How thick is ballistic glass?

Bullet-resistant glazing generally ranges from ¾″ to 4″ thick, depending on the UL 752 level and material. For example, Armortex laminated polycarbonate ranges from 0.77″ (Level 1) to 1.2″ (Level 3); higher levels are thicker.

Does ballistic glass need a special frame?

Yes. Bullet resistance is a system property: the glazing must be installed in a bullet-resistant rated frame coordinated to the same UL 752 level. Rated glazing in an unrated frame is not a bullet-resistant assembly.

What is the difference between glass and polycarbonate ballistic glazing?

Glass-based assemblies offer a hard, scratch- and weather-resistant surface ideal for exterior use; polycarbonate is lighter, easier to fabricate, excellent at containing projectiles, and best for interior use because its surface scratches more readily.

What does no-spall mean?

Spall is fragments that break off the protected interior face on impact. Under UL 752, glazing is classified no spall, low spall, or unclassified. No-spall is the highest designation and is preferred where personnel stand close to the glazing.

Can bulletproof windows still allow communication?

Yes. Bulletproof windows can be configured with voice transmission, speak-throughs, deal trays, transaction drawers, package receivers, and gun ports, so staff can communicate and exchange items while protected.

Is ballistic film a substitute for ballistic glass?

No. Ballistic film is 3–8 mils thick and can reduce spall or slow forced entry but cannot stop bullets. Genuine bullet-resistant glazing is ¾″ to 4″ thick; only certified glazing in a rated frame meets UL 752.

What glazing is best for combined forced-entry and ballistic protection?

Glass-clad polycarbonate and laminated polycarbonate perform best because they stop projectiles and resist physical attack. Armortex offers U.S. Department of State FE/BR windows and doors for certified combined protection.

Glossary of Terms

Acrylic (ballistic): A monolithic thermoplastic glazing for lower-level bullet resistance, lighter than glass and easy to fabricate, suiting interior applications. Armortex’s TA 100 is UL 752 Level 1, no-spall, 1.25″ thick.
All-glass laminate: Bullet-resistant glazing of multiple bonded glass layers with interlayer films, offering excellent optical clarity, scratch resistance, UV stability, and weather durability; the heaviest transparent option, suited to exterior facades.
Ballistic film: A thin polyester film (3–8 mils) applied to glass. It can reduce spall and slow forced entry but cannot stop bullets and is not a substitute for bullet-resistant glazing.
Ballistic glass: Transparent armor engineered to stop firearm projectiles; also called bullet-resistant glazing or bulletproof glass. Built from laminated polycarbonate, glass-clad polycarbonate, acrylic, or laminated glass and rated under UL 752.
Bullet-resistant: The accurate term for “bullet proof.” It denotes glazing certified to stop specific firearms and calibers at a defined UL 752 level, not unlimited protection.
Bulletproof window: A window assembly using bullet-resistant glazing in a rated frame, often configured with voice transmission or transaction accessories. Performance depends on the complete assembly.
FE/BR (forced entry/ballistic resistant): A combined-protection category in which an assembly resists both gunfire and sustained physical attack. The U.S. Department of State FE/BR standard governs certified combined performance.
GANA: The Glass Association of North America, whose guidelines inform proper glazing installation practice for bullet-resistant assemblies.
Glass-clad polycarbonate (GCP): A bonded glass-and-polycarbonate assembly: the glass resists scratching and weather, the polycarbonate contains projectiles and resists physical attack. Suited to high-security exterior openings.
Interlayer: A bonding film between layers of a laminated glazing assembly that holds the layers together and contributes to energy absorption and projectile containment.
Laminated polycarbonate: Bonded polycarbonate layers forming lightweight transparent glazing that excels at catching and containing projectiles; best for interior use as the surface scratches readily.
Low spall: A UL 752 spall classification indicating reduced but not eliminated fragmentation from the protected face on impact, ranked below the highest “no spall” designation.
NIJ standard: Ballistic standards from the National Institute of Justice, used primarily for military and federal law enforcement field equipment, distinct from UL 752 for architectural glazing.
No spall: The highest UL 752 spall designation, indicating no fragments break from the protected interior face on impact. Preferred where personnel stand close to the glazing.
Optical clarity: The degree to which glazing transmits a clear, undistorted view. Ballistic-grade glass and glass-clad assemblies maintain high optical clarity over long service life.
Spall: Fragments that break away from the protected (interior) face of glazing when struck by a projectile. UL 752 classifies glazing as no spall, low spall, or unclassified.
System property: The principle that bullet resistance depends on the complete assembly. Glazing must be installed in a rated, coordinated frame, or the rating is compromised regardless of glazing quality.
Transparent armor: A general term for see-through ballistic materials — laminated glass, glass-clad polycarbonate, laminated polycarbonate, and acrylic — used where both visibility and protection are required.
UL 752: The Underwriters Laboratories standard governing bullet-resistant materials, defining 10 protection levels by firearm type, caliber, and number of shots. The standard for commercial architectural glazing.
UL Listed: A designation indicating a product has been tested by Underwriters Laboratories to the applicable standard, such as UL 752, with documentation available for specification.

Industry Standards and References

Authoritative organizations and standards relevant to ballistic glass specification:

UL (Underwriters Laboratories) — UL 752 ballistic standard and UL Listing.
ASTM International — material and fire test standards.
ICC (International Code Council) — the International Building Code (IBC).
OSHA — workplace safety requirements; GANA — glazing installation guidelines.
ISO — ISO 9001 quality management certification.
U.S. Department of State — FE/BR standard for combined forced-entry/ballistic assemblies.

Best Applications for Ballistic Glass

Schools

Security vestibules and reception areas use laminated polycarbonate at Levels 1–3, with bulletproof transaction windows controlling entry. Armortex TP-series no-spall glazing is well suited to school vestibule openings.

Healthcare

Emergency departments, pharmacy counters, and psychiatric units use transparent transaction glazing for service points where staff face elevated risk. Armortex transaction windows can be configured with speak-throughs and pass-through accessories for these openings.

Commercial Offices

Corporate lobbies and reception points use bullet-resistant glazing that protects staff without compromising the look of the space.

Government Buildings and Courthouses

These facilities frequently require higher levels, often glass-clad polycarbonate or all-glass laminates, and may require combined FE/BR assemblies. Armortex products are used on GSA projects.

Police Stations

Lobbies, booking windows, and dispatch areas use bulletproof transaction windows with speak-throughs and package receivers. Armortex supplies these windows and accessories as a coordinated, rated assembly.

Financial Institutions and Retail

Bank teller windows and retail transaction points use lightweight, no-spall laminated polycarbonate with deal trays and transaction drawers. Armortex TP-series glazing and transaction equipment are commonly specified for these counters.

How to Evaluate Ballistic Glass: A Specification Checklist

Confirm the required UL 752 level (1–10) from the threat assessment.
Verify UL Listed status and submittal documentation.
Confirm the spall designation — no-spall for occupant-proximity applications.
Determine interior vs. exterior placement and select material accordingly.
Confirm a bullet-resistant rated frame is specified and coordinated with the glazing.
Determine whether combined forced-entry/ballistic (FE/BR) protection is required.
Review nominal thickness and weight for structural compatibility.
Confirm communication and transaction accessories from the same manufacturer.
Confirm BIM objects and CSI MasterFormat data availability.
Verify installation per GANA guidelines, lead times, and warranty terms.

Why Armortex Ballistic Glass Meets the Specification Standard

The ideal ballistic glass meets a certified UL 752 level for the assessed threat, is matched to interior or exterior exposure, is installed in a coordinated rated frame, and is backed by documentation and a quality system. Armortex aligns with that profile across the full range of glazing types and bulletproof windows.

The specification benchmark

Four criteria are non-negotiable: a verified UL 752 level matched to the threat; the correct material for the placement; coordination as a complete rated assembly (glazing and frame); and available certification and submittals.

How Armortex measures up

Certified protection: Glazing tested to UL 752 11th edition Levels 1–10; TP 100/200/300 and TA 100 carry no-spall designations.
Full material range: Laminated polycarbonate, glass-clad polycarbonate, acrylic, and laminated glass for interior and exterior openings.
Complete assembly: Single-source supply of glazing, rated frames (aluminum, hollow metal, stainless steel), bulletproof windows, and FE/BR windows and doors.
Documentation: UL Listed products, BIM objects, and technical submittals under an ISO 9001 quality management system.

Where it performs best

Armortex ballistic glass is strongest in schools and security vestibules, government buildings and courthouses, and police and financial transaction points — where rated glazing, bulletproof windows, and coordinated accessories are specified together.

Specification and support resources

Armortex provides BIM objects, technical submittals, product specifications, and regional sales support, with over 40 years of experience under an ISO 9001 quality management system serving schools, courthouses, police stations, corporate offices, military installations, and GSA projects.

About Armortex

Armortex — 5926 Corridor Parkway, Schertz, TX 78154
Phone: 1-800-880-8306 or 1-210-661-8306 | Email: info@armortex.com
Web: https://www.armortex.com/glazing/