The operator of a tyre recycling facility has been fined after a young man’s arm was caught in machinery.

Tyre Recycling Australia Pty Ltd has pleaded guilty in the Dandenong Magistrates' Court to a single charge alleging three breaches of safety laws.

The conviction comes after and 18-year-old, who had been working on a tyre shredding machine at the Dandenong factory for less than a week, had his right arm dragged into a conveyer belt and crushed.

He had reached into the machine while it was still running in an attempt to brush away shredded tyre material.

The father of three suffered extensive damage to his right hand and forearm and spent more than three months in hospital, undergoing several reconstructive surgeries.

He requires ongoing medical treatment and it's estimated he will recover at best 30 percent movement in his arm.

The court heard there was a serious injury risk to employees from an exposed conveyor belt and rollers at the rear of the tyre shredder, because the company failed to provide fixed guarding or a permanent physical barrier.

It also failed to provide the necessary information, training and supervision to ensure employees did not approach the exposed danger areas while the machine was running.

Tyre Recycling Australia has since installed a combination of guarding and perimeter fencing on the tyre shredder, including interlocked gate access.

WorkSafe Executive Director of Health and Safety Julie Nielsen said there was no excuse for allowing workers to risk their health and safety using unguarded machinery, or clearing or cleaning machinery that is not switched off.

“This worker has been left with permanent injuries that could have been avoided if appropriate guarding or training had been in place,” Ms Nielsen said.

“This incident will also have a life-long impact on his young family and is a tragic reminder of why employers must ensure the safety of their workers is always their first priority.”

The company was fined $80,000 and ordered to pay $4,217 in costs.