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The fire has been brought under control.
The cause of the incident remains unknown.
On Sunday, Replas representatives said it was a "small electrical" fire, and the business will reopen on Monday.
"The Replas way is to always learn from mistakes and we will be implementing better practises around any potential risk in future," director Mark Jacobsen said.
EARLIER: 12pm
Emergency services have closed Elsworth Street to fight a fire at the Replas facility in Canadian.
Crews were called about 11.30am on Saturday morning to the scene.
There are at least two trucks on scene, with firefighters spotted heading into the building wearing breathing apparatus to bring the fire under control and isolate the power.
A staff member at a neighbouring business called Triple-0 in after he noticed columns of black smoke going into the air
He said he was "obviously worried it could get out of control", and called it in as soon as he saw it, adding he was worried about toxic fumes.
Police are on scene.
Replas is a company which creates new products out of recycled plastics.
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