About 25 firefighters were called to Overall Forge about 10.30am on Friday following Triple-0 calls.

A furnace at the site overheated, sparking a fire, and forced the evacuation of dozens of workers.

Firefighters quickly brought the incident under control and spent the next 90 minutes cooling the furnace.

Paramedics also attended the RW Henry Drive property, but nobody required treatment.

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Fire and Rescue NSW Inspector Frank Finlay said the organisation had three fire trucks in attendance.

Seven Rural Fire Service vehicles were also called to the scene.

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"There were no injuries," he said.

"It was a good outcome.

"The business has its own emergency team onsite.

"They had an emergency plan before we got there and handed it over to us when we arrived."

Firefighters remained on the scene for about two-and-a-half hours.

The incident emitted a large amount of smoke into the factory.

The business provides products to the mining, oil and gas, marine and power industries throughout the Asian region.

It was unclear if the blaze would impact production at the site.

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