The gas-fuelled oven fire forced 10 workers at the Walker Street factory to evacuate before the arrival of FRNSW trucks.
Firefighters, from Windsor and Richmond, cut the gas and electricity supply and, wearing breathing apparatus, used numerous carbon dioxide (CO2) portable extinguishers to suppress the flames.
The oven kept re-igniting due to its contents – highly flammable plastics.
Firefighters had to re-enter the factory and hit the seat of the fire with additional carbon dioxide from an FRNSW bulk CO2 truck at the scene.
Fire crews are using thermal imaging cameras and gas detectors to monitor the area and prevent re-ignition.