SKU: HSL-500
These labels are heat sensitive material that turn black if any heat is ever present that is greater than approximately 300 degrees F.
The 300 degree F temperature is used because once aluminum fire ladder materials (6061-T6 alloy) reach this 300 degree F (even if only for a moment), the ladder material may have lost at least 25% of it's load capacity. This heat exposure effect is not reversible in the ladder and can continue to accumulate over its entire lifetime.
