4" Gray SoundAway FireFlex Pyramids are excellent sound absorbers for
high-temperature applications or in buildings requiring Class 1 fire
rated materials. Our line of FireFlex Acoustic Foams are heat
resistant to 482 degrees F and able to withstand constant temperatures
up to 320 degrees F. Engineered for environments where temperatures
are high, sparks or other hot materials may fly and for rooms where
large numbers of people congregate.