At what temperature do heat sensor labels on metal and fiberglass ladders change color?

Heat sensor labels on metal and fiberglass ladders are designed to provide a visual indicator of exposure to high temperatures, which can compromise the integrity of the materials. Specifically, these labels typically change color at around 300°F (149°C). This temperature is significant because it is close to the point where the structural properties of the ladders begin to degrade, particularly for fiberglass, which can lose its strength and flexibility when exposed to high heat.

Recognizing that ladders may have reached potentially dangerous conditions is crucial for ensuring safety during firefighting operations. Observing the color change serves as a prompt for firefighters to remove ladders from service and assess the risk of continued use, thereby enhancing overall safety.

The other temperature options provided do not represent the typical activation point for heat sensor labels on these types of ladders, as those temperatures are either too low or too high for the intended purpose of effectively monitoring safety during firefighting activities.