Amidon Briefing · Independent Testing
Published March 19, 2026
UL 752 Explained: What “Level 10” Really Means
“UL 752 Level 10” gets used as a headline number, but the standard itself is worth understanding on its own terms — it’s not a marketing scale, it’s a real, independently administered bullet-resistance classification.
What UL 752 Actually Tests
UL 752 is Underwriters Laboratories’ standard for bullet-resisting equipment, testing how a material performs against specific rounds fired under controlled conditions — penetration, spalling, and multi-hit performance all factor into where a material lands on the scale.
Why Level 10 Is the Relevant Number
The standard defines a range of protection levels tied to different calibers. Level 10 sits at the top of that scale, designating the .50 caliber threat. UL 752 is a barrier standard, and it asks a barrier question: can the material stop a small number of worst-case rounds, fired square at its face, without penetration or rear-side spall. For a teller window, a guard booth or a hardened wall, that is exactly the right question.
Why the Distinction Matters
A shoot house asks a different question. The wall is not there to deflect a handful of rounds; it is there to absorb tens of thousands of them, arriving from every angle, year after year, without ricochet and without degrading into a hazard. That is a capture problem, not a barrier problem, and it is why Amidon Ballistic Concrete is formulated to a controlled density rather than to a compressive strength number. At standard density it captures 9mm, 5.56mm and 7.62mm rounds at 15 degrees obliquity or greater, and 9mm and .50 caliber rounds at 30 degrees or greater. Every element is proof-tested with live fire before it enters service and accepted only when measured penetration falls between 1 and 5 inches. Know which question your facility is asking, and the right material becomes obvious.
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