Note: The new 12th edition organizes these levels by weapon type, grouping Levels 1-3 under "Handguns," Levels 4-10 under "Rifles," and adding a separate category for "Shotguns" to improve clarity and simplify threat assessment.
For reference, the older Level 4 threat (a single .30-06 round) is now classified as , and the older Level 8 threat (five 7.62mm rounds) is now classified as UL-RF 4 . The standard now also includes up to Level 10 for specialized high-power scenarios.
For decades, the physical security industry relied on a linear interpretation of UL 752. It assumed that a higher numeric level naturally provided equal or better protection than a lower level. In reality, ballistic dynamics do not work linearly; a barrier capable of stopping a high-velocity, single-shot rifle round might fail when exposed to multiple, tightly grouped, low-velocity handgun rounds.
Each level requires the material to completely stop the ammunition without creating "spall"—which refers to fragments breaking off the backside of the material and causing injury to people behind the barrier. Recent Updates and Changes in the New PDF Edition ul 752 standard pdf new
A greater number of material samples are required for testing.
Since UL 752 is also an American National Standard (ANSI), you can purchase it via the ANSI webstore. The price is identical, but sometimes sales tax varies.
| Level | Threat Level | Caliber/Type | | --- | --- | --- | | I | 9mm, .357 Magnum | Handgun | | II | .357 Magnum, .44 Magnum | Handgun | | III | 5.56mm, 7.62mm | Rifle | | IV | .30-06, .30-06 AP | Rifle | | V | 7.62mm x 39mm, 5.56mm x 45mm | Rifle | | VI | .357 SIG, .44 Magnum | Handgun | | VII | 5.56mm, 7.62mm | Rifle | | VIII | .50 BMG | Large Caliber Rifle | Note: The new 12th edition organizes these levels
The UL 752 standard is the premier benchmark for testing and certifying bullet-resistant materials and structures. Developed by Underwriters Laboratories (UL), this standard establishes precise performance requirements for products designed to protect against ballistic threats. Architects, security professionals, and manufacturers rely on the UL 752 standard to ensure that protective barriers—ranging from bank teller windows to reinforced doors—meet strict safety criteria. Accessing a current UL 752 standard PDF is essential for anyone involved in designing, manufacturing, or installing ballistic protection systems. Overview of the UL 752 Standard
Designed to withstand high-power rifle fire, specifically the .30-06 caliber. This level marks the transition from handgun protection to rifle protection.
Enhanced testing methods include better definitions of shot patterns, environmental conditioning (testing materials in hot/cold scenarios), and refined witness panel specifications (used to test for spall). Understanding UL 752 Levels (1–10) For decades, the physical security industry relied on
This new system provides greater clarity, separating handguns from high-velocity rifles, allowing for more precise risk assessment. 2. Stricter and More Consistent Testing Procedures
Protects against .30-06 armor-piercing rifle rounds.
Explain the difference between and fiberglass in this context. Help you find a certified supplier for a specific material. What type of facility are you trying to secure? UL 752, NIJ & ASTM: Bullet-Resistant Glass Standards 2026
: No part of the bullet or projectile can pass through to the other side.