What is the flash point of asphalt?

What is the flash point of asphalt?

• A. 350°F
• B. 450°F
• C. 500°F
• D. 400°F

Answer: (B)

Flash point is the temperature at which asphalt vapors can ignite if a flame or ignition source is present. Asphalt has a relatively high flash point, reflecting its lower volatility compared with many liquids. A common value used in roofing practice is about 450°F, which is why 450°F is the best choice. In hot-applied roofing work, you heat asphalt to roughly the 375–425°F range for workability, staying well below the flash point to avoid ignition. The lower temperatures listed are typical working temperatures, not the point at which ignition would occur.

Flash point is the temperature at which asphalt vapors can ignite if a flame or ignition source is present. Asphalt has a relatively high flash point, reflecting its lower volatility compared with many liquids. A common value used in roofing practice is about 450°F, which is why 450°F is the best choice. In hot-applied roofing work, you heat asphalt to roughly the 375–425°F range for workability, staying well below the flash point to avoid ignition. The lower temperatures listed are typical working temperatures, not the point at which ignition would occur.