Which of the following is a flame spread test method?

The burning brand test is a recognized method for assessing flame spread characteristics of fire-resistance-rated materials. In this test, a test specimen is exposed to a flame or burning brand under controlled conditions to evaluate how quickly flames are able to spread across the surface of the material. This helps in determining the material's fire behavior, particularly in terms of its effectiveness as a fire barrier and its overall safety in a fire scenario.

The burning brand test is particularly useful for materials that might be exposed to open flames or intense heat in an actual fire situation. It provides critical data that informs building codes and fire safety standards, ensuring that materials selected for construction projects are adequately vetted for safety regarding flame spread.

In contrast, other test methods like the wind test, radiant heat test, and temperature test do not primarily focus on measuring flame spread. The wind test evaluates the effect of wind on fire spread, while the radiant heat test examines the material's response to radiant heat exposure. The temperature test gauges how materials perform at specific temperatures but does not directly assess how flames propagate across surfaces. Therefore, the burning brand test is the most relevant method concerning flame spread testing.