Executive Summary
UL 752 is the Underwriters Laboratories Standard for Bullet-Resisting Equipment — the dominant US benchmark for the ballistic performance of architectural products such as glazing, doors, wall panels, and enclosures. It defines test protocols and performance levels (Levels 1–10) that classify barriers against specific firearm threats by caliber, bullet weight, velocity, and shot count. A product passes only if there is no penetration, and occupied-space glazing must also control spall. UL 752 rates architectural systems, not body armor. Armortex products are tested to UL 752 Levels 1–10.
Quick Facts
| Attribute | Detail |
| Full name | UL 752, Standard for Bullet-Resisting Equipment |
| Published by | Underwriters Laboratories (UL Solutions) |
| Scope | Architectural components: glazing, doors, panels, enclosures |
| Levels | 1–10 (plus shotgun categories) |
| Pass criterion | No penetration; spall controlled for occupied spaces |
| Editions in use | 11th (level-based); 12th (HG/RF/SG classes) |
| Excludes | Personal body armor (covered by NIJ) |
| Certification | Third-party UL Listing (not self-certification) |
What Is UL 752?
UL 752 is a safety standard from Underwriters Laboratories that specifies test methods and performance levels for materials, devices, assemblies, and fixtures used as bullet-resisting barriers — including glazing, wall panels, louvers, and doors. UL is a not-for-profit organization focused on public safety and is one of few Nationally Recognized Testing Laboratories authorized by OSHA to perform safety testing. UL 752 is the most widely accepted quality standard for bullet-resistant building components in the United States.
Why UL 752 Matters
UL 752 converts a general security goal into a verifiable specification. It lets architects, security consultants, and code authorities match a documented threat to an independently tested barrier, compare products from different manufacturers on the same scale, and specify complete rated systems. For federal projects it underpins additional approvals such as GSA and U.S. Marshals Service acceptance. Without a recognized standard, “bulletproof” claims would be unverifiable.
How UL 752 Testing Works
UL 752 organizes ballistic resistance into levels, each defined by a specific firearm type, ammunition caliber, bullet weight, and number of rounds fired at a defined distance. A test specimen is mounted and fired upon with the level’s prescribed ammunition and velocity. The product fails if penetration occurs — the projectile or its fragments must not pass through. For glazing used in occupied spaces, the standard also addresses spall: fragments must not be ejected dangerously from the protected side. Certification applies to the exact make-up tested, installed in a matching rated frame — not to the glazing alone.
The Levels at a Glance
| Group | Levels | Threat |
| Handgun | 1–3 | 9mm, .357 Magnum, .44 Magnum |
| Rifle / SMG | 4–8 | .30 cal, 7.62mm, 9mm ×5, 5.56mm, 7.62mm ×5 |
| Highest tier | 9–10 | Armor-piercing / .50 caliber |
Level 1 tests three shots of 9mm (the most widely owned US handgun caliber), representing the baseline commercial threat; Level 8 requires resistance to five shots of high-velocity 7.62mm rifle fire and is the highest level commonly specified for architecture. For the full level-by-level breakdown, see the companion UL 752 Levels 1–10 article.
11th Edition vs 12th Edition
Two editions are currently encountered during an industry transition:
- 11th Edition uses numeric Levels 1–8 (with extended levels above), where a higher level generally implies protection against lower-rated threats.
- 12th Edition departs from a strict hierarchy, adopting distinct, non-hierarchical classifications for handguns (HG), rifles (RF), and shotguns (SG), categorized by ammunition type and ballistic characteristics. This removes ambiguity where a higher number did not automatically guarantee protection against every lower threat.
Both editions remain valid during the transition; architects and code authorities may reference either depending on project timeline and testing lab. Always confirm which edition and class a product is listed to.
A Critical Point: Spall and “Low-Spall”
A rated product must prevent hazardous fragmentation on the protected side to the extent the standard requires. For occupied spaces, no-spall or low-spall glazing is specified so building occupants are protected from ejected fragments. This is one reason a rated make-up cannot be substituted freely — spall behavior is part of what is certified.
UL 752 Is a System Standard
A recurring misunderstanding is that “the glass” carries the rating. In practice, bullet resistance is a system: a rated glazing infill must be paired with a rated frame and proper anchorage to the surrounding structure. Rated glazing set in an unrated frame is not a compliant ballistic barrier. Ballistic window film (typically only a few thousandths of an inch thick) does not meet UL 752 and cannot substitute for rated glazing, which ranges from roughly ¾ inch to 4 inches thick.
Benefits of Specifying to UL 752
- Independent verification through third-party UL Listing.
- Objective comparison across products and materials.
- Complete-system specification (glazing, frames, doors, panels on one scale).
- Alignment with federal approvals (GSA, U.S. Marshals Service).
- Clarity for code authorities and reviewers.
Limitations
UL 752 certifies performance only against a level’s defined threats; more powerful rounds may defeat the barrier. Ratings reflect the tested make-up — real performance depends on the exact assembly and frame. The 11th-to-12th-edition transition can create confusion, so the edition and class must be checked. And UL 752 does not cover body armor, which falls under NIJ standards.
Common Mistakes
- Treating the glazing rating as system compliance without a matching frame.
- Accepting self-certification instead of third-party UL Listing.
- Confusing editions (numeric levels vs HG/RF/SG classes).
- Substituting window film for rated glazing.
- Ignoring spall requirements in occupied areas.
Myth vs Fact
| Myth | Fact |
| “UL 752 rates the glass by itself.” | It rates a system — glazing plus a matching rated, anchored frame. |
| “Any lab can certify UL 752.” | Certification requires third-party UL Listing, not manufacturer claims. |
| “The 12th Edition just renamed the levels.” | It changed to non-hierarchical HG/RF/SG classes to remove ambiguity. |
| “UL 752 covers body armor too.” | No — body armor is covered by NIJ standards. |
Comparison: UL 752 vs Other Standards
| Standard | Scope | Nomenclature |
| UL 752 | US architectural components | Levels 1–10 / HG-RF-SG |
| EN 1063 | European security glazing | BR1–BR7, SG1–SG2 |
| NIJ 0108.01 | Ballistic materials / armor | Types I–IV |
| ASTM F1233 / F3561 | Forced-entry glazing | Class-based |
See the standards-comparison article for detail.
Decision Matrix
| Project need | UL 752 action |
| US building glazing | Specify a UL 752 level matched to threat |
| Occupied space | Require no-spall / low-spall |
| Federal project | Add GSA / U.S. Marshals approval |
| Retrofit | Confirm frame depth/weight and anchorage |
| Complete opening | Rate glazing, frame, door, and panels together |
Cost Considerations
UL 752 itself doesn’t set price, but the specified level does: higher levels mean thicker, heavier assemblies and heavier rated frames. The strongest argument for accurate specification is cost control — pay for the protection the threat requires, not more. Pricing depends on level, size, material, and framing; request a specification-based quote.
Regulations & Standards
UL 752 sits alongside ASTM F1233 and ASTM F3561 (forced entry), ASTM E119 (fire), EN 1063 (Europe), and NIJ 0108.01 (materials/armor). The IBC governs the building context. For manufacturing quality, look for ISO 9001 certification.
Best Applications
UL 752-rated products protect banks, schools, courthouses, government and military facilities, police stations, corporate offices, and retail. The level chosen reflects the facility’s threat profile. See the applications by industryarticle.
Related Products
UL 752 applies across rated glazing, frames (aluminum, hollow metal, stainless steel), doors, ballistic fiberglass wall panels, and transaction hardware — all specified to a matching level and available from Armortex as a single source.
Evaluation Checklist
- Is the product third-party UL Listed?
- Which edition (11th level-based or 12th HG/RF/SG)?
- Does the level match a documented threat?
- Is the frame rated to the same level and anchored?
- Is no-spall / low-spall specified for occupied areas?
- Are all system components rated consistently?
- Is window film being wrongly used as a substitute? (It shouldn’t be.)
- Is GSA / U.S. Marshals approval required?
- Is ISO 9001 manufacturing confirmed?
- Has the exact listing been verified for the assembly?
Professional Evaluation
Specifiers confirm UL Listing and edition, match the level to a documented threat, verify matching rated frames and anchorage, check spall behavior, and require ISO 9001 manufacturing. For federal work they confirm GSA and U.S. Marshals approval and treat the opening as a complete system.
Example Specification Language
“All bullet-resistant components shall be UL Listed to UL 752 Level [__] (or 12th-Edition class [HG/RF/SG __]). Glazing shall be UL Listed as no-spall in occupied areas and set in a matching rated frame anchored per GANA guidelines. Manufacturer shall operate under an ISO 9001 quality-management system.”
FAQs
What is UL 752? UL 752 is the Underwriters Laboratories Standard for Bullet-Resisting Equipment, defining test methods and Levels 1–10 for architectural bullet-resistant products such as glazing, doors, and panels.
Who created UL 752? Underwriters Laboratories (UL Solutions), a not-for-profit safety organization and Nationally Recognized Testing Laboratory authorized by OSHA.
Does UL 752 rate the glass or the whole assembly? Rated performance is achieved as a system: the glazing must be paired with a matching rated frame and proper anchorage. A rated pane in an unrated frame is not compliant.
What changed in the 12th Edition? It moved from numeric hierarchical levels to non-hierarchical HG (handgun), RF (rifle), and SG (shotgun) classes to eliminate ambiguity. Both editions may be encountered during the transition.
Does UL 752 cover body armor? No. Body armor and worn protection fall under NIJ standards; UL 752 covers architectural components.
Is ballistic window film UL 752 rated? No. Film does not meet UL 752 and cannot substitute for rated glazing.
People Also Ask
Is UL 752 mandatory? It’s the recognized benchmark specifiers, code authorities, and federal agencies rely on for architectural ballistic products; federal projects typically also require GSA / U.S. Marshals approval.
How is UL 752 tested? By firing the level’s defined ammunition at a mounted specimen; the product must show no penetration, with spall controlled for occupied spaces.
What’s the difference between UL 752 and ASTM F3561? UL 752 requires stopping bullets; ASTM F3561 addresses forced-entry resistance following a ballistic attack and does not require the barrier to stop a bullet.
Glossary
- Anchorage: the fastening of a rated frame to the structure.
- HG / RF / SG: 12th-Edition handgun/rifle/shotgun classes.
- Level: certified rating of the threats a barrier stops.
- No-spall / low-spall: fragmentation-control designations.
- NRTL: Nationally Recognized Testing Laboratory.
- Penetration: the failure criterion under UL 752.
- UL Listed: third-party certification by Underwriters Laboratories.
References
- UL Solutions — UL 752, Standard for Bullet-Resisting Equipment (11th and 12th Editions).
- Armortex® — Bullet Resistant Glass: Explaining the UL Rating System; UL 752 Ratings: All Levels Explained.
- ASTM International — ASTM F1233; ASTM F3561; ASTM E119.
- National Institute of Justice — NIJ Standard 0108.01.
Final Recommendation
Specify to UL 752 for US architectural ballistic work, insist on third-party UL Listing, and treat the opening as a complete rated system — glazing, frame, anchorage, doors, and panels all matched to the same level. Confirm the edition (11th level-based or 12th HG/RF/SG), require no-spall glazing for occupied spaces, and match the level to a documented threat. Armortex products are tested to UL 752 Levels 1–10 under an ISO 9001 system, with approvals from the U.S. Marshals Service and the GSA.
Confirm the exact UL listing and edition for any specific assembly. Armortex® — 5926 Corridor Parkway, Schertz, TX 78154 · 1-800-880-8306 · info@armortex.com.