, which introduces a major shift from numerical levels to threat-based designations. UL Solutions Key Changes in the 12th Edition (New)

UL 752 is a product safety standard developed by Underwriters Laboratories (UL) that outlines the specific requirements for materials, devices, and fixtures used to create bullet-resisting barriers. The primary purpose of this standard is to evaluate and certify that a barrier can withstand a defined number of shots from specified firearms and ammunition types.

Armor-piercing military ammunition (e.g., 7.62mm rifle lead core with armor-piercing capabilities). Minimum Velocity: 2,750 fps. Number of Shots: 5 shots.

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The is widely considered the industry benchmark for testing and certifying the ballistic performance of building materials and architectural assemblies.

What (e.g., glazing, fiberglass, steel doors) you are working with?

Unlike public regulations, UL (Underwriters Laboratories) standards are copyrighted documents. Here is everything you need to know about the , the eleven levels of protection, and how to legally obtain the PDF.

The revisions to UL 752 are more than just administrative. The goal was to increase clarity and usability for everyone involved in security planning. The new structure is designed to be non-hierarchical, meaning a material's rating is specific to the type of firearm it was tested against. This allows specifiers to choose a product based on a very specific threat profile. For example, an environment concerned with handgun threats does not need to meet the higher test requirements of the rifle tables.

| Level | Ammunition | Bullet Weight | Velocity (FPS) | # of Shots | | :--- | :--- | :--- | :--- | :--- | | | .30-06 Rifle | 180 gr | 2540-2794 | 1 | | UL-RF 2 | 7.62mm Rifle (.308) | 150 gr | 2750-3025 | 1 | | UL-RF 3 | 5.56mm Rifle (.223) | 55 gr | 3080-3383 | 5 | | UL-RF 4 | 7.62mm Rifle (.308) | 150 gr | 2750-3025 | 5 | Data Source:

Unlike body armor standards (which are typically governed by the National Institute of Justice or NIJ), UL 752 focuses primarily on stationary architectural elements and materials. A product earning a UL 752 listing has undergone destructive testing at an independent laboratory to verify it can withstand specific firearm rounds without allowing penetration or dangerous structural spalling (flying debris). 2. Deciphering the UL 752 Protection Levels

Safety in structural ballistic protection has reached a new milestone with the release of the UL 752 12th Edition , published on October 17, 2023