The Australian customs authorities launched an investigation into the case in June and are due to report to the Minister of Home Affairs with recommendations on or before April 15, 2010 on whether to publish a dumping duty notice.

The action followed Canada’s decision in March to impose dumping and subsidising tariffs on Chinese extrusions.

It is unclear the volume of extrusions shipped to Australia from China, but a source familiar with the investigation said earlier this year China's extrusions exports ballooned in the first quarter.

“In reaching this preliminary decision, Customs and Border Protection is satisfied that the dumped and subsidised goods appear to have caused material injury to the Australian industry producing like goods,” said the customs in a notice on its website (