Thick black smoke billowed into the air at a Mount Maunganui chemical plant on Sunday night after metal filters in an open yard caught fire.
Fire fighters arrived at Hexion Specialty Chemicals Limited on Totara Street at about 7.30pm to battle the blaze.
It took them close to an hour to completely extinguish the fire.
Outiside Hexion Specialty Chemicals Limited on Monday morning.
Tauranga senior station officer, Mark Keller, says the metal filters were full of a flammable resin.
He says the build up of resin is formed when the filters are used to process pine tree extract into turpentine.
“The fire started in the metal filters and at this stage we think it was caused by chemical spontaneous combustion.”
The fire spread to other metal components in the yard, including a shipping container.
There was no structural fire damage to any part of the plant because it was a safe distance from buildings.
Mark says the blaze was extremely hot and because of the chemicals involved, it sent “think black smoke” into the air.
“We had to put a lot of water onto it, about 30 litres a second, just to knock the heat out of it.”
“The fire was very hot at its centre.”