The blaze was reported just after midnight Wednesday at a business on Batavia Street that manufactures foam products, according to the Orange County Fire Authority. Officials say employees noticed smoke coming from one of the foam buns, which are described as being as big as rail cars, before the flames took off.
Employees tried moving the bun to a more open area but the ignition was too fast, causing them to be evacuated. Nobody was injured.
The material itself made the blaze harder to contain.
"One of these buns caught fire in the yard and it spread to the rest of the foam," said Capt. Ryan O'Connor. "It was very intense. A lot of heat, a lot of smoke."
The main portion of the fire, which created a smoke plume that could be seen from miles away, was knocked down around 2:30 a.m. but firefighters remained on scene until smoldering spots were completely extinguished.
The cause of the fire is under investigation.