Executive Summary
Level 5 ballistic glass is bullet-resistant glazing rated to UL 752, the standard maintained by Underwriters Laboratories. According to Armortex, Level 5 glazing is designed to withstand at least one 7.62mm rifle full-metal-jacket round traveling at a velocity of at least 2,750 feet per second, placing it in the rifle-threat range rather than the handgun range covered by Levels 1–3. Because it must stop a high-velocity rifle round, Level 5 glazing is thicker and heavier than lower-level products and is typically built from laminated glass or a glass-and-laminated-polycarbonate make-up. It is specified for high-risk sites such as government buildings, military bases, courthouses, and police facilities. Alternative names include bullet-resistant glass, bulletproof glass, and BR glazing.
Quick Facts Table
The figures below reflect what Armortex publishes for its bullet-resistant glazing line. Where Armortex does not publish a fixed value, that is stated plainly rather than estimated.
| Attribute | Detail |
| Product type | UL 752 Level 5 bullet-resistant glazing (rifle-rated) |
| Typical users | Government, military, courthouses, police stations, high-risk facilities |
| Threat stopped | At least one 7.62mm rifle FMJ at ≥ 2,750 f/s (per Armortex) |
| Common materials | Laminated glass, or glass and laminated polycarbonate |
| Thickness | Bullet-resistant glass is generally ¾″–4″; exact Level 5 nominal thickness varies — Armortex advises confirming per product |
| Standards | UL 752, 11th edition (Levels 1–10); install per GANA guidelines |
| Cost range | Not published by Armortex — quoted per project |
| Lifespan | Not specified by Armortex |
| Best applications | Rifle-threat, high-liability, and critical-control environments |
| Limitations | Greater thickness and weight than lower levels; requires a rated frame |
What Is Level 5 Ballistic Glass?
Bullet-resistant glass is glazing engineered to stop projectiles without shattering, absorbing the round’s energy and retaining the bullet within the material. Whether it succeeds depends on the material and architecture of the glass, the force and material of the projectile, and the number of subsequent impacts. To guarantee a stated level of protection, glazing is tested against a standardized methodology that accounts for all of these factors.
Armortex ties its protection levels to the UL 752 rating system from Underwriters Laboratories, a not-for-profit organization and one of the few Nationally Recognized Testing Laboratories authorized by OSHA to perform safety testing. UL has established eight primary ballistic levels, and Armortex’s glazing line references UL 752, 11th edition, Levels 1 through 10.
Level 5 specifically covers glazing designated to withstand at least one 7.62mm rifle full-metal-jacket round at a minimum velocity of 2,750 feet per second. This distinguishes it from handgun-rated levels: Level 1 addresses 9mm, Level 2 addresses .357 Magnum, and Level 3 addresses .44 Magnum, while Level 4 and above step up into rifle-caliber threats.
A note on “Level 5 thickness”
A single fixed thickness for Level 5 glass is not published by Armortex. Its glazing page lists nominal thickness as “varies (contact Armortex to confirm),” and notes that real bullet-resistant glass generally runs from about ¾″ to 4″ thick. The published, exact-thickness products in Armortex’s glazing line (the TP and TA series) currently span Levels 1–3. Because stopping a rifle round requires more material than stopping a handgun round, Level 5 glazing sits well above those handgun products in thickness and weight — but the confirmed nominal dimension is quoted per make-up and application, not stated as one universal number.
Why It Is Growing
Armortex notes that ballistic glazing, once concentrated in banks and government buildings, is being adopted more broadly. Level 3 products, long standard in police stations and government facilities, are increasingly being deployed at scale for school security. Higher levels follow the same trajectory as institutions reassess rifle-threat scenarios.
- Threat escalation: Levels 4 and above are built to withstand fire from rifles and automatic weapons, which drives specification of rifle-rated glazing at the highest-risk sites.
- Institutional adoption: Military bases and government buildings typically utilize products rated across UL Levels 4–8, where the added material cost is justified by the threat.
- System thinking: Growing recognition that bullet resistance is a system property — glazing plus a rated frame — is pushing buyers toward complete, tested assemblies rather than glass alone.
Who Should Use It?
Level 5 glazing is aimed at facilities whose threat model includes rifle fire and whose liability profile demands certified protection. Armortex identifies the highest-risk applications — where added material cost is justified — as the natural home for Level 4–8 products.
- Government and military: Government buildings and military bases that routinely specify UL Level 4–8 protection.
- Justice and law enforcement: Courthouses and police stations protecting personnel in customer-facing or high-exposure positions.
- Critical control points: Secure facilities and critical control rooms where a specific bullet-resistant standard must be met and certified.
When It Is NOT the Right Choice
Level 5 is not the default answer for every security concern. Over-specifying adds thickness, weight, and cost without matching benefit when the actual threat is lower.
- Handgun-only threats: If the credible threat is limited to handguns, a handgun-rated level (1–3) may be appropriate; Armortex’s TA/TP glazing addresses 9mm, .357 Magnum, and .44 Magnum at those levels.
- Non-ballistic goals: If the objective is only to mitigate glass injuries, reduce spall, or delay forced entry from thrown or blunt objects, ballistic film or lower-tier measures may suit — but Armortex is explicit that film cannot reliably stop bullets.
- Unrated framing: Glazing alone, however well rated, is not a solution. Without a bullet-resistant frame the assembly is not a rated system, so Level 5 glass in an unrated opening is the wrong specification.
Types
Armortex offers bullet-resistant glazing in several material families. At rifle levels such as Level 5, all-glass and glass-clad make-ups are typical; lighter polymer products are more commonly rated for handgun-level protection in Armortex’s published line.
| Material | Characteristics | Notes from Armortex |
| All glass (laminated) | Durable, optically clear, heavier | Used for higher-level, glass-based make-ups |
| Glass + laminated polycarbonate | Glass durability with lighter polycarbonate; can be “no spall”/“low spall” | Combination make-up for interior or exterior use |
| Laminated polycarbonate | Lighter, easier to cut, polish, fabricate | Published TP series rated Levels 1–3 (handguns) |
| Acrylic | Lightweight, easy to fabricate | Published TA 100 rated Level 1 (9mm) |
Published Armortex glazing products with confirmed thickness (handgun levels, for reference):
| Product | Material | UL Level | Nominal thickness | Nominal weight |
| TP 100 | Laminated polycarbonate | Level 1 (no spall) | 0.77″ | 4.8 lbs/sq ft |
| TA 100 | Acrylic | Level 1 (no spall) | 1.25″ | 7.6 lbs/sq ft |
| TP 200 | Laminated polycarbonate | Level 2 (no spall) | 1.00″ | 6.4 lbs/sq ft |
| TP 300 | Laminated polycarbonate | Level 3 (no spall) | 1.2″ | 7.7 lbs/sq ft |
These products illustrate the pattern rather than the Level 5 figure: as the rated level rises, thickness and weight rise with it. Level 5, addressing a rifle round, is specified above this range, with the exact make-up confirmed by Armortex per application.
How It Works
Bullet-resistant glazing works by absorbing and dissipating the kinetic energy of an incoming round across layered materials, arresting the projectile inside the make-up rather than allowing it to pass through. The layered architecture is what stops the bullet, so both the composition and the total build-up matter.
- A projectile strikes the outer face at high velocity.
- The layered glass and/or polymer make-up absorbs and spreads the impact energy.
- The round is captured within the glazing; “no spall” or “low spall” constructions limit fragments ejected from the protected side.
- The glazing must sit in a bullet-resistant frame so the full opening performs as a rated system.
Benefits
- Rifle-level protection: Rated to stop at least one 7.62mm rifle FMJ at ≥ 2,750 f/s, extending protection beyond the handgun range.
- Optical clarity: Armortex designs bulletproof windows for high optical clarity so sightlines and daylight are preserved.
- Configurable systems: Glazing can be combined with voice transmission and gun ports so personnel can communicate and respond in extreme situations.
- Certified assurance: UL 752 rating provides third-party-tested, certifiable protection where the liability profile demands it.
- Material choice: All-glass and glass-clad make-ups balance durability, weight, and clarity for the application.
Limitations
- Thickness and weight: Rifle-rated glazing is thicker and heavier than handgun-rated products, affecting framing, structural loading, and hardware.
- System dependency: The glazing is only as good as the opening; an unrated frame undermines the rating.
- Published-data gaps: Armortex does not publish a single fixed Level 5 thickness, cost, or lifespan, so specifiers must request confirmation for a given make-up.
- Not a film substitute: Ballistic film is not a lower-cost alternative to rated glazing; it does not stop bullets.
Common Mistakes
- Treating film as bulletproof: Assuming thicker film equals bullet resistance. Typical ballistic film is only 3–8 mils thick — about a credit card — versus ¾″–4″ for real bullet-resistant glass.
- Skipping the rated frame: Adding glazing or film to a window without a rated frame; bullet resistance is a system property and the frame must be rated too.
- Mis-matching level to threat: Specifying a handgun level where a rifle threat exists, or over-specifying where it does not.
- Improper installation: Not installing per GANA guidelines with competent, experienced installers.
Myth vs Fact
| Myth | Fact |
| Thicker film makes a window bulletproof. | Even relatively thick film is thin compared with ballistic glazing; film may reduce spall but cannot reliably stop projectiles. |
| Adding film means you don’t need a rated frame. | Bullet resistance is a system property — the frame must be rated as well. |
| “Bulletproof” glass is truly impenetrable. | It is bullet-resistant: designed to stop specified rounds under a defined test, not guaranteed against every threat. |
| Any Level 5 glass is a fixed, known thickness. | Nominal thickness varies by make-up; Armortex advises confirming the value per product and application. |
Comparison Table
Comparing Armortex glazing material families across the properties that matter when moving up to rifle-level protection:
| Material | Relative weight | Fabrication | Typical published level | Spall control |
| Laminated glass / glass-clad | Heavier | Specialized | Higher / rifle-level make-ups | Can be no/low spall |
| Laminated polycarbonate | Lighter | Easier to cut & polish | Levels 1–3 (published) | No spall available |
| Acrylic | Light | Easy to fabricate | Level 1 (published) | No spall available |
Decision Matrix
| If your goal is… | Consider |
| Stopping a rifle round (7.62mm) | UL 752 Level 5 glazing in a rated frame; confirm make-up and thickness with Armortex |
| Handgun protection at a service counter | Level 1–3 glazing (TA/TP series) matched to the specific caliber |
| Lightest weight for a given handgun level | Laminated polycarbonate over acrylic or glass where the rating allows |
| Reducing glass injury / spall only | Ballistic film or non-rated measures — with the understanding they don’t stop bullets |
| Maximum protection (Level 4–8 sites) | Rifle-rated glazing as part of a full tested system |
Cost Considerations
Armortex does not publish list pricing for its bullet-resistant glazing, and cost is quoted per project. In general terms, moving from handgun to rifle-level protection increases material volume, weight, and framing requirements, all of which influence cost. Because bullet resistance is a system, the budget should account for the rated frame and any accessories — voice ports, gun ports, transaction hardware — not glazing alone. For accurate figures, Armortex directs buyers to request a quote.
Regulations & Standards
- UL 752: The governing ballistic standard; Armortex references UL 752, 11th edition, Levels 1–10. Level 5 corresponds to a 7.62mm rifle FMJ at ≥ 2,750 f/s.
- UL / OSHA / NRTL: Underwriters Laboratories is a Nationally Recognized Testing Laboratory authorized by OSHA to perform safety testing, and developed the most widely accepted bulletproof-glass quality standards.
- GANA guidelines: Installation should be performed by competent, experienced installers per Glass Association of North America guidelines.
- UL Listing: Individual glazing make-ups can be UL Listed, including as “no spall” or “low spall.”
Best Applications
| Sector | Why Level 5 fits |
| Government facilities | Routinely specify UL Level 4–8 where rifle threats are credible |
| Military bases | High-risk sites where the material cost of top-tier protection is justified |
| Courthouses | Protect personnel and secure proceedings against elevated threats |
| Police stations | High-exposure public-facing positions and secure areas |
| Critical control rooms / secure facilities | Where a specific certified standard must be met |
Related Products
Because bullet resistance is a system, Level 5 glazing is typically specified alongside complementary Armortex products:
- Bullet-resistant windows and aluminum storefront systems (rated framing).
- Bullet-resistant doors.
- Transaction hardware: deal trays, transaction drawers, package receivers.
- Communication and defense accessories: speakers/voice ports and gun ports.
- Fiberglass composite wall panels for opaque areas around glazed openings.
Evaluation Checklist
- Is the credible threat handgun or rifle level?
- Does the specified level (e.g., UL 752 Level 5) match that threat?
- Is the glazing paired with a bullet-resistant, rated frame?
- Is the make-up UL Listed for the required level?
- Is spall control (no spall / low spall) required on the protected side?
- Have thickness and weight been confirmed with the manufacturer for the chosen make-up?
- Have structural loads for the added weight been accounted for?
- Is the material family (glass, glass-clad, polycarbonate) right for the environment?
- Are voice ports, gun ports, or transaction hardware needed?
- Will installation follow GANA guidelines with experienced installers?
- Has a project-specific quote been requested for cost?
- Are interior vs exterior conditions suited to the selected product?
Professional Evaluation
Specifiers evaluate ballistic glazing as a tested system, not a single pane. The starting point is the threat assessment: identifying the credible weapon and caliber determines the UL 752 level, and Level 5 is reserved for a defined rifle round. From there, experts weigh the make-up (all-glass versus glass-clad versus polymer), the confirmed thickness and weight, spall behavior on the protected face, and the rating of the surrounding frame. Certification to UL 752 provides the third-party evidence that ties the assembly to a defined performance level.
Example Specification Language
The following neutral wording illustrates how Level 5 glazing is typically specified. Confirm exact make-up, thickness, and weight with the manufacturer.
Provide bullet-resistant glazing tested to UL 752, 11th edition, Level 5 (rifle, 7.62mm FMJ at not less than 2,750 f/s). Glazing shall be a laminated glass or glass-and-laminated-polycarbonate make-up, UL Listed for the specified level, and where required, no-spall or low-spall on the protected face. Glazing shall be installed in a bullet-resistant frame rated to the same level so the complete opening performs as a rated system. Installation shall follow GANA guidelines and be performed by competent, experienced installers. Nominal thickness and weight per manufacturer’s confirmed data for the selected make-up.
FAQs
What is Level 5 ballistic glass?
It is bullet-resistant glazing rated to UL 752 Level 5, designed to withstand at least one 7.62mm rifle full-metal-jacket round traveling at a velocity of at least 2,750 feet per second — a rifle-level threat above the handgun-rated Levels 1–3.
How thick is Level 5 ballistic glass?
Armortex does not publish a single fixed thickness for Level 5. Its glazing page lists nominal thickness as varying by make-up and notes that real bullet-resistant glass is generally about ¾″ to 4″ thick. Confirm the exact figure with Armortex for the chosen product.
Why isn’t there one exact Level 5 thickness?
Thickness depends on the make-up — all-glass versus glass-clad polycarbonate — and the application. Armortex advises confirming nominal thickness and weight per product rather than relying on a universal number.
What round does Level 5 stop?
At least one 7.62mm rifle FMJ at a minimum velocity of 2,750 f/s, per Armortex’s description of the UL rating system.
How does Level 5 differ from Levels 1–3?
Levels 1–3 address handgun calibers (9mm, .357 Magnum, .44 Magnum). Level 4 and above move into rifle threats, so Level 5 glazing is thicker, heavier, and typically glass-based.
What materials are used for Level 5 glazing?
Rifle-level glazing is typically laminated glass or a glass-and-laminated-polycarbonate make-up. Lighter polycarbonate and acrylic products in Armortex’s published line are rated for handgun levels.
Do I need a special frame?
Yes. Bullet resistance is a system property; the frame must be rated to the same level or the assembly is not a rated system.
Is bulletproof film an alternative?
No. Typical ballistic film is only 3–8 mils thick and cannot reliably stop bullets. It may reduce spall or delay forced entry but is not a substitute for rated glazing.
Can Level 5 glazing be no-spall?
Glazing make-ups can be UL Listed as “no spall” or “low spall” to limit fragments ejected from the protected side.
Who typically specifies Level 5?
Government buildings, military bases, courthouses, and police stations — high-risk sites that commonly use UL Level 4–8 products.
How much does it cost?
Armortex does not publish pricing; cost is quoted per project and depends on make-up, size, framing, and accessories.
How is it installed?
By competent, experienced installers per GANA guidelines, in a rated frame.
Can it include voice ports or gun ports?
Yes. Armortex glazing can be configured with voice transmission and gun ports so personnel can communicate and respond.
What standard governs it?
UL 752, 11th edition, maintained by Underwriters Laboratories — an OSHA-recognized Nationally Recognized Testing Laboratory.
Is Level 5 the highest level?
No. UL defines eight primary levels; Level 8 is the highest, tested against multiple 7.62mm rifle shots. Armortex references Levels 1–10 for its glazing line.
People Also Ask
Is Level 5 glass bulletproof?
It is bullet-resistant — rated to stop a defined rifle round under UL 752 testing — rather than impervious to every threat.
Can Level 5 stop an AK-47 or AR-15 round?
Level 5 is defined around a 7.62mm rifle FMJ; matching glazing to a specific weapon should be confirmed against the exact caliber and the UL 752 level with the manufacturer.
Is thicker glass always better?
Not necessarily. The right choice is the level matched to the credible threat, in a rated frame — over-specifying adds weight and cost without added benefit.
What’s the difference between bullet-resistant and bulletproof?
The terms are used interchangeably, but “bullet-resistant” more accurately reflects that glazing is tested against specified rounds, not guaranteed against all.
Glossary
Acrylic: A lightweight, easily fabricated glazing material; used in Armortex’s Level 1 TA 100 product.
Ballistic film: A thin window film (typically 3–8 mils) that may reduce spall but does not stop bullets.
Bullet-resistant (BR): Glazing engineered to stop specified projectiles under a defined test standard.
Bulletproof glass: Common term for bullet-resistant glazing; technically bullet-resistant rather than impenetrable.
FMJ: Full metal jacket — a bullet construction referenced in UL 752 test rounds.
f/s: Feet per second — the velocity unit used to define UL 752 threat levels.
GANA: Glass Association of North America, whose guidelines govern proper glazing installation.
Glass-clad polycarbonate: A make-up combining glass durability with lighter polycarbonate.
Laminated glass: Bonded glass layers used in higher-level ballistic make-ups.
Laminated polycarbonate: A lighter, easily fabricated polymer glazing; Armortex TP series (Levels 1–3).
Low spall: A UL Listing indicating reduced fragmentation on the protected side.
No spall: A UL Listing indicating no fragments ejected from the protected side.
Nominal thickness: The stated build-up thickness of a glazing make-up; varies by product.
NRTL: Nationally Recognized Testing Laboratory, authorized by OSHA to perform safety testing.
OSHA: Occupational Safety and Health Administration.
Rated frame: A bullet-resistant frame required for the glazing to perform as a rated system.
Spall: Fragments ejected from the protected face of glazing on impact.
System property: The principle that bullet resistance depends on glazing and frame together.
UL: Underwriters Laboratories, developer of the UL 752 ballistic standard.
UL 752: The ballistic-resistance standard defining Levels 1–10 for glazing and materials.
Level 5: UL 752 level for glazing rated to stop a 7.62mm rifle FMJ at ≥ 2,750 f/s.
References
- Armortex — Bullet Resistant Glass: Explaining the UL Rating System: https://www.armortex.com/bullet-resistant-glass-explaining-rating-system/
- Armortex — Glazing (product data, thickness range, film FAQs): https://www.armortex.com/glazing/
- Armortex — TP 100 Bullet Resistant Glazing: https://www.armortex.com/our-products/tp-100/
- Armortex — TA 100 Bullet Resistant Glazing: https://www.armortex.com/our-products/ta-100/
- Armortex — TP 200 Bullet Resistant Glazing: https://www.armortex.com/our-products/tp-200-bullet-resistant-glazing/
- Armortex — TP 300 Bullet Resistant Glazing: https://www.armortex.com/our-products/tp-300/
Final Recommendation
Level 5 ballistic glass is the right specification when the credible threat includes rifle fire — specifically a 7.62mm FMJ at 2,750 f/s or greater — and when the site’s liability profile requires certified, UL 752-tested protection. Its strengths are clear rifle-level performance, optical clarity, and configurability with voice and gun ports; its trade-offs are greater thickness and weight and the need for a rated frame.
On the specific question of Level 5 glass thickness: Armortex does not publish one universal figure. Real bullet-resistant glass runs roughly ¾″ to 4″, thickness rises with the rated level, and the confirmed nominal dimension for a Level 5 make-up should be obtained from Armortex for the chosen product and application. For any high-risk project, specify the complete rated system — glazing plus frame plus accessories — install per GANA guidelines, and request a project-specific quote and confirmed thickness rather than relying on a single published number.
Prepared from published Armortex® materials. All performance ratings, thicknesses, and weights should be confirmed with Armortex for the specific product and application.