UL 263 Fire-Resistance Rating

Fire safety testing has always been part of building code, but now it’s becoming a bigger part of security planning, too.

As threats evolve and regulations tighten, facility stakeholders are being asked to do more: Contain fires longer. Secure exit routes. Integrate protection into every component, from entry doors to partitions.

At Total Security Solutions, we design and fabricate custom ballistic systems that can also be tested to UL 263, so your facility isn’t left vulnerable or out of compliance when it matters most.

What Is UL 263 and What Does It Test?

UL 263, also known as the “Standard for Fire Tests of Building Construction and Materials,” was developed by Underwriters Laboratories to evaluate how well structural elements resist fire over time. It applies to:

• Doors and door frames
• Walls and wall systems
• Ceilings and floor assemblies
• Glazing components and partitions

• Roof assemblies, beams and columns

UL 263 tests are conducted by exposing a complete assembly to extreme temperatures inside a controlled furnace. The setup simulates a building fire and measures how long the system maintains its structural integrity and thermal insulation—typically across 1-, 2-, 3-, or 4-hour increments.

The furnace follows a standardized time-temperature curve of roughly 1,000°F at five minutes, climbing to about 1,700°F at one hour and 2,000°F by the four-hour mark. Many wall and partition assemblies are also subjected to a hose stream test after the fire exposure, which checks whether the assembly can still resist the physical force and cooling shock of firefighting water.

Key performance metrics include:

• Heat resistance: How well the component resists transferring heat to the unexposed side.
• Structural endurance: Whether the wall, floor, or door maintains shape and strength over time.
• Flame containment: How effectively the component contains fire within a given space.

These tests help ensure that, in the event of a fire, critical systems provide enough time for evacuation and emergency response without contributing to fire spread or containment failure.

Fire Safety Testing Standards: UL 263 vs. ASTM E119

UL 263 and ASTM E119 are both critical fire safety testing standards used to evaluate the performance of building materials and assemblies when exposed to fire. While they follow similar test procedures, including standardized furnace testing and time-temperature curves, they differ in how results are applied, interpreted, and listed for use in construction projects.

UL 263: Tested and Listed Systems with Prescriptive Assembly Requirements

UL 263 is widely used in fire-rated construction for its tested, prescriptive approach. Products or assemblies evaluated to UL 263 are listed in UL’s proprietary directory, which provides specific design configurations that must be followed to maintain the rating.

These listings are detailed and strict. If any part of the assembly is changed (such as stud type, fastener spacing, or insulation), the fire rating may no longer apply.

• Listings describe a complete, approved configuration
• Used to certify materials like doors, panels, and wall assemblies
• Prescriptive—designed to be followed exactly as tested
• Widely accepted by code authorities and building inspectors

ASTM E119: Flexible Evaluation Standard with Broader Use Cases

ASTM E119, published by ASTM International, uses similar testing procedures but does not require inclusion in a proprietary listing directory. Results are provided as performance data, allowing for more flexibility in how test outcomes are applied. This is especially useful in engineering judgments, comparative research, and designs that may include equivalent or substitute components.

• Provides performance data rather than rigid system listings
• Commonly used in engineering evaluations and modeling
• Often specified in federal or institutional projects
• Allows for flexibility and adaptability in custom builds

Total Security Solutions can help you interpret your specs, evaluate which standard applies, and provide a solution that meets all performance and code requirements.

When Fire Protection and Ballistic Systems Work Together

Not every ballistic barrier has to be fire-rated. But in certain environments, there's a need to integrate the two elements.

A hospital emergency department may need bullet-resistant entry doors that also meet fire code for corridor separation. Or a school might want a secure vestibule with ballistic glass and framing that can delay an attacker and also contain smoke or flame during a fire event. These are increasingly common design requirements in new construction and retrofits alike.

That's why Total Security Solutions offers custom-engineered ballistic systems that are not by default tested to UL 263, but can be tested and certified to fire-resistance standards like UL 263 as a part of a customization.

There's sometimes the assumption that ballistic materials can "probably hold up to fire too." The truth is only formal testing can confirm that. We always recommend independent verification to both standards to confirm adequate ballistic and fire performance.

At TSS, we engineer for certainty. When you need performance under pressure—from bullets or from fire—we deliver solutions that are tested, compliant, and built to protect. Contact us today to learn more.