The Underwriter’s Laboratory (UL) recognizes bullet-resistant glass through 10 specific levels, each tailored to counter distinct types of ammunition threats.
These levels are categorized based on their capability to stop various handgun and rifle bullets. To be UL-rated, a product must meet established minimum stopping standards during testing. Discover more about the UL 752 standard levels, which classify bullet-resistant glass.
Understanding UL 752 Bullet-Resistance Levels
The testing of UL 752 standards involves common bullet sizes, configurations, and weights (grains), as well as speeds, to determine the effective stopping power of bullet-resistant glass. Different thicknesses and materials are employed in the glass manufacturing process to determine the levels of resistance. Depending on the specific application, level 1 or level 2 glass may be sufficient for protection in environments such as retail outlets, ticket booths, or homes. Higher levels of protection, which can stop high-powered rifle bullets, may be necessary for places like embassies or military compounds.
The UL 752 ballistic standards are not structured in a strictly linear fashion
The UL 752 ballistic standards are not structured in a strictly linear fashion. Each level is crafted to resist specific types of threats, with particular requirements and capabilities, rather than presenting a straightforward progression in bullet resistance. Selecting the appropriate level of bullet-resistant glass depends on the likely threats for a given security application.
Breakdown of UL 752 Levels
Level 1: This foundational level safeguards against small caliber handguns. Glass rated at level 1 can absorb three 9mm full metal copper jacketed bullets. It's optimal for securing service windows in retail settings, ticket kiosks, or gas stations.
Level 2: Level 2 glass can handle three shots from a handgun that fires up to .357 Magnum rounds. This makes it suitable for businesses requiring heightened security, such as banks or financial institutions.
Level 3: Offering protection from larger caliber handguns, level 3 glass withstands three .44 Magnum rounds. High-risk areas like courthouses, police departments, and government offices might prefer level 3 bullet-resistant glass. Protection accumulates through levels 1 to 3, meaning level 3 glass protects against handguns up to and including .44 Magnum, encompassing previous levels.
Level 4: Levels 4 to 8 of UL 752 glass standards focus on resisting impacts from larger caliber and assault rifle bullets. Level 4 glass withstands a single impact from a 180-grain .30 caliber rifle at close range, making it suitable for high-security commercial buildings and government sites.
Level 5: This level can endure a single impact from a 150-grain .308 rifle bullet at specified velocities. It's tailored for high-security glass applications in commercial, governmental, and select military settings.
Level 6: Level 6 glass is designed to stop five 124-grain bullets from a 9 mm handgun, typically employed in high-security government and military facilities. The distinction in level 6 testing is the requirement to stop five shots as opposed to three for level 1, using 9 mm bullets.
Level 7: This glass endures up to five shots from a high-powered rifle, using 5.56 mm full metal copper jacket lead core rounds at high speeds, ideal for high-risk government and military purposes.
Level 8: Designed to stop ammunition from assault or automatic weapons, level 8 glass can effectively halt five 7.62 mm rounds, making it apt for very high-risk security scenarios.
Level 9: Level 9 is tailored to withstand a single shot from a .30-06 FMJ round and multiple shots from armor-piercing rounds, suitable for extremely high-security setups.
Level 10: The highest level, level 10 glass can stop a .50 caliber round fired from a high-powered rifle, primarily used for military-grade applications. UL levels 9 and 10 provide enhanced protection against the most formidable threats, including armor-piercing and military-grade bullets, for installations demanding maximum security.
The Underwriter’s Laboratory recognizes bullet-resistant glass in 10 levels for handgun and rifle bullets, categorized by the type of threat they are designed to stop. Products must achieve minimum stopping capabilities in testing to receive a rating. Learn more about the 10 UL 752 standard levels of bullet-resistant glass.
Understanding the Different Levels of Bullet-Resistant Glass
Testing for UL 752 ballistics standards uses common bullet sizes, configurations, weights (grain) and speeds to establish the stopping power of bullet-resistant glass. Different thicknesses and materials used to manufacture glass determine what it can withstand.
Depending on your application, you may find that a material tested at level 1 or 2 provides sufficient protection, such as for retail locations, ticket booths, or residential settings. In other cases, such as embassies or military facilities, you may want the added security offered by stronger glass able to stop high-powered rifle bullets.
UL 752 ballistic standards do not progress in a linear pattern, meaning that each level is designed for specific types of threats rather than following a simple increase in bullet resistance. Instead, they are grouped into different categories with similar requirements and capabilities. When selecting bullet-resistant glass for a security application, you want to select the type that can handle the most likely threats.
UL 752 Levels of Bullet-Resistant Glass
- Level 1: The most basic level of UL 752 glass protects against small caliber handguns. Glass with a level 1 rating can withstand impact from three 9mm full metal copper jacketed bullets. It is a thin glass that makes an excellent security solution for service windows at retail locations, ticket booths, or gas stations.
- Level 2: This level of UL-rated bullet-resistant glass can withstand three shots from a handgun firing up to .357 Magnum lead-jacketed rounds. It is a good choice for businesses that need slightly higher security, such as banks or other financial institutions.
- Level 3: Level 3 provides protection from large-caliber handguns and can withstand three .44 Magnum rounds. High-risk locations such as courthouses, police stations, and government offices might request UL Level 3 bullet-resistant glass. Protection is cumulative between the first three levels of bullet-resistant glass. This means that level 3 glass will protect against handguns with calibers up to and including .44 magnum, including those covered by levels 1 and 2.
- Level 4: UL 752 ballistic standards for levels 4 through 8 indicate that the glass is designed to withstand varying impacts from larger caliber and assault rifle bullets, whereas levels 1-3 are designed for protection against small caliber handguns. Level 4 bullet-resistant glass can withstand a single impact from a 180-grain .30 caliber rifle at 4.6 meters. It offers excellent protection against most threats to high-security commercial buildings, government offices, and other high-threat areas. Our Bullet Resistant Level 4 High-Security Guard Booth uses UL 752 Level 4 glass to provide exceptional occupant protection.
- Level 5: UL 752 Level 5-rated glass can withstand a single impact from a 150-grain .308 rifle bullet at 4.6 meters. Testing is at velocities between 2750 and 3025 feet per second. This is a high-security glass used in commercial, government, and some military applications.
- Level 6: Bullet-resistant glass with a UL 752 Level 6 rating can stop five 124-grain bullets from a 9 mm handgun at velocities between 1400 and 1540 feet per second. You will typically see this glass in high-security applications such as secure government and military facilities. Testing for levels 1 and 6 of bullet-resistant glass both use 9 mm bullets. However, level 1 glass must stop three shots, while level 6 must stop five to meet UL 752 ballistics standards.
- Level 7: UL 752 Level 7 glass can withstand up to five shots from a high-powered rifle. It is tested using 5.56 mm rifle full metal copper jacket lead core rounds at speeds of 3080 to 3388 feet per second. It is suitable for high-risk government and military applications.
- Level 8: Level 8 glass is designed to stop fire from assault or automatic weapons. It can effectively stop five 7.62 mm lead core full metal copper jacket military ball rounds, making it ideal for very high-risk government and military applications.
- Level 9: Level 9 bullet-resistant glass can withstand a single shot from a high-powered rifle firing a .30-06 FMJ round. It must also stop multiple shots from armor-piercing rounds.
- Level 10: Level 10 UL glass can stop a .50 caliber round fired from a high-powered rifle. This is primarily a military-grade glass. UL levels 9 and 10 offer superior protection against armor-piercing and military-grade bullets. They are suitable for installations requiring maximum security, such as in military applications.
